Relevant bibliographies by topics / Clear-cutting / Dissertations / Theses
To see the other types of publications on this topic, follow the link: Clear-cutting.

Dissertations / Theses on the topic 'Clear-cutting'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 31 dissertations / theses for your research on the topic 'Clear-cutting.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Sircom, Margaret A. "Cutting clear." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ47766.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Rondon, Xanic Jimena. "Assessing the Sustainability of Strip Clear-Cutting in the Peruvian Amazon." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1217874385.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Pinheiro, Fabiola M. R. "Effects of forest fires and clear-cutting on mercury loading to boreal lakes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0034/MQ64431.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ussiri, David A. N. "Organic matter chemistry and dynamics in a forest soil affected by clear-cutting disturbance." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Chaundy, Rosalind Frances Cordes. "Moth diversity in young jack pine-deciduous forests after disturbance by wildfire or clear-cutting." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ45603.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bäckman, Jenny. "Nitrification and nitrifying bacterial communities in coniferous forest soils : effects of liming and clear-cutting /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2002/tek809s.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Fredrickson, Richard J. "The Effects of Disease, Prey Fluctuation, and Clear-Cutting on American Marten in Newfoundland, Canada." DigitalCommons@USU, 1990. https://digitalcommons.usu.edu/etd/6436.

Full text
Abstract:
Individual variation in survival and behavior of American marten (Martes americana) was studied in relation to disease, prey fluctuation, and clear-cutting from 10 January 1986 through 20 August 1987 in Newfoundland, Canada. Thirty-seven of forty marten captured on the study area were telemetered and monitored for part or all of the study. Marten mortality was concentrated in two intervals, fall 1986 and late winter 1987. Mortality during fall 1986 was attributable to encephalitis, while marten deaths during late winter 1987 resulted from predation and starvation attributable to the prey decline. Nonsuppurative encephalitis was first detected 7 October 1986; no further evidence of the disease could be found after 1 November 1986. In early October 1986, declining populations of meadow voles were documented; by June 1987 no voles could be found on the study area. In both mortality periods, young-of-the-year marten had lower survival rates than older marten, and transients survived less well than residents. However, encephalitis appeared to be a less selective mortality agent than the prey decline. Females, considered to be more vulnerable to resource perturbations, had lower survival rates and males higher rates during late winter 1987 than during the disease epizootic. Clear-cutting operations ran from 4 August 1986 through 14 November 1986; 3% (259 ha) of the study area was cut. Marten of all ages avoided clear-cuts during logging operations and for the first nine months afterward. Resident kits made significantly greater use of clear-cuts than older residents and were 3.2 times more likely than older residents to be found within clear-cuts. However, resident kits were 2.6 times and adults 8.3 times more likely to use habitats other than clear-cuts. The decline in prey abundance resulted in several changes in marten movement and spacing behaviors. Intrasexual home range overlap by residents was eliminated. All female residents present before the prey decline either died or abandoned their home ranges. The ratio of transients to resident numbers increased. Recolonization of vacated habitats was slower, and duration of dispersal for females increased. Intruder pressure and mating access appeared to play little role in the observed changes in social spacing. The decline in marten numbers during and after the prey decline appeared to have been partially affected by changes in spacing behaviors.
APA, Harvard, Vancouver, ISO, and other styles
8

Fredriksson, Maria. "Organic chlorine in soilwater : Influence of Clear-cuttning and Nitrogen." Thesis, Linköping University, The Tema Institute, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10062.

Full text
Abstract:

Chlorine is one of most common element on earth and it is essential in every living organism, but can also cause problems in the environment. Chlorine can exist both as inorganic (Clin) and organically bound (Clorg). Earlier was the common opinion that Clorg only occurs from anthropogenic sources, but the last years, research has shown that chlorine is a part of the biogeochemical cycle and Clorg also can have natural sources. Many chlorinated substances are poisonous, so the fact that they have a natural source created attention. Fertilizations with nitrogen in forest areas have shown unexpected consequences, such as an increase leakage of nitrogen to ground and surface water. Clear-cutting is a disturbance on the ecosystem and the environment is sensitive for disturbances. Because of the fact that both chlorine and fertilization can be environmental problems and that clear-cutting is a big disturbance in the nature, this study will investigate if there are changes of organic chlorine (Clorg) in soil water after clear-cutting and if fertilization with nitrogen has any influence on the concentration of Clorg. This study was made in a forest area in Värmland, Sweden (Hagfors). Chemical analyses were made in the laboratory though measuring AOX (absorbable organic halogens). The result of this study showed that clear-cutting probably has some effect on the Clorg concentration and that nitrogen doesn’t have any influence.

APA, Harvard, Vancouver, ISO, and other styles
9

Briel, Annemarie. "Hydrological Modelling at Road Structures in a Changing Climate and Landuse." Thesis, KTH, Mark- och vattenteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-171827.

Full text
Abstract:
An increase in the frequency and intensity of storm events is predicted by numerous climate researchers for the north of Europe. Not only this but also landuse change in form of clear-cutting can have an impact on the discharge of rivers and with that on road drainage structures. Extensive societal costs can be the consequences of blockage and underdimensioned structures. Hydrological models are powerful instruments that can be used to assess the future dimension requirements for road drainage structures especially in specifically vulnerable areas. In this thesis the hydrological model MIKE SHE was set up to study the discharge and water level at two pipe bridges and one culvert within the catchment of the river Hakerud in Västra Götaland, Sweden. Three scenarios were considered including a changing climate until 2050 and 2100 and a clear-cut scenario aiming to find out if the current design is sufficient for the future. This model can be used as an example model set-up for similar studies taking the recommendations of the experience gained in this thesis into consideration. For the Swedish Transport Administration further studies on this basis can contribute to decision making on the dimensioning of road drainage structures in the future to ensure a safe and robust infrastructural system.
APA, Harvard, Vancouver, ISO, and other styles
10

Karlsson, Daniel. "Logging impacts on catchment biogeochemistry: A review : with emphasis on northern boreal ecosystems." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-90175.

Full text
Abstract:
The impacts of current forest management methods on surface water quality, especially in northern parts of Sweden, are largely unexplored. In this review reports linked to logging impacts on catchment biogeochemistry, (with special emphasis on boreal ecosystems) has been assessed. Logging disturbances in boreal forest catchments can change biogeochemical processes in soils by alter transpiration, soil conditions, temperature, soil microbial activities and water fluxes. Combined these changes can cause increased soil nutrient leaching to receiving waters. In the studies reviewed, dissolved organic carbon (DOC) concentrations and export generally increased after logging. Similar responses followed for phosphorous (P), but to a lesser extent for nitrogen (N). Streamflow and peakflow and the export of suspended matter (SM) can also be altered after logging. Removal of streamside vegetation may result in increased stream water temperatures and potentially affect lake water temperature, deepen the epilimnion and deplete oxygen (O2) concentrations. Increased wind exposure can resuspend sediments and potentially release bioavailable P. Affected lake water concentrations of N can be considered negligible after logging, whereas tot-P concentrations has shown to increase to an almost twofold level in some studies. The overall impact on the pelagic productivity are therefore most likely those connected to increased DOC and SM concentrations. The general impact on fish biomass can be considered insignificant. In conclusions, to improve future forest management and for further understanding concerning the biogeochemical environmental impacts that forestry might have on freshwaters, additional studies are still required.
APA, Harvard, Vancouver, ISO, and other styles
11

Eriksson, Rasmus. "Testing the influence of riparian buffer design on stream biodiversity following drought." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184151.

Full text
Abstract:
Forestry is a major industry in Sweden and the most common method to harvest timber is to clear-cut large areas. Clear-cutting can alter multiple physical, chemical, and ecological characteristics of headwater streams. To minimize these effects, vegetated riparian ‘buffers zones’ are often spared along streams and lakes. Despite this, there are uncertainties regarding optimal width of buffers to safeguard streams from clearcutting effects. In this study, I ask how riparian buffer width influences stream macroinvertebrate communities, and how this influence may be altered by summer drought. I tested this in 24 headwater streams, half located in northern Sweden and the other half in southern Sweden. Streams in each region included four different buffer width categories (n = 3), including: “no buffer” (no trees left post-harvest), “thin buffer” (< 5 m), “moderate buffer” (> 5 m) and “reference” (no harvest). I analysed a suite of metrics that describe the abundance, richness, and composition of macroinvertebrates, and compared these across streams with different buffer properties. Regionally, southern streams had marginally greater taxonomic richness and relative abundance of sensitive taxa compared to northern counterparts, regardless of buffer conditions. Further, thin and absent buffers performed the best across several macroinvertebrate metrics, particularly for southern streams. Antecedent drought had no observable effects on macroinvertebrate communities, but taxonomic richness across region was positively correlated with stream pH. Overall, my findings, while tentative given low statistical power, suggest that retaining coniferous-dominated buffers may not lead to the desired ecological outcomes in boreal headwaters.
APA, Harvard, Vancouver, ISO, and other styles
12

Åström, Marcus. "Aspects of heterogeneity : effects of clear-cutting and post-harvest extraction of bioenergy on plants in boreal forests." Doctoral thesis, Umeå universitet, Ekologi, miljö och geovetenskap, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-935.

Full text
Abstract:
Abstract. The objectives of this thesis are to evaluate (1) the influence of slope aspect on boreal plant responses to clear-cutting and (2) the effects of post-harvest extraction of bioenergy (logging residues or slash) on plant composition, richness and performance in clear-cuts. Such insight is essential for understanding changes in species composition and richness in response to clear-cutting and application of intensified harvesting systems. The focus is on productive and managed spruce dominated forests and focal organisms are mosses, liverworts (i.e. bryophytes) and vascular plants. Space-for-time substitution studies were performed in south- and north-facing slopes located in 10 forests and 10 adjacent clear-cut stands in central Sweden. Differences between forests and clear-cuts were interpreted as effects of clear-cutting. The results show that the response of all three focal groups differed between aspects. More species were lost in south-facing slopes and clear-cutting reduced species richness of liverworts as well as of bryophytes and vascular plants associated with sheltered habitats. By contrast, clear-cutting caused no reduction in any group and more species were added in north-facing slopes. As a result north-facing clear-cuts generally had higher species richness than their forest counterparts. The disparate patterns in species’ response between aspects were most likely caused by initial microclimatic differences and a greater microclimatic change in south-facing slopes, in response to clear-cutting. A paired comparative study of conventionally harvested (i.e. slash left) and slash-harvested clear-cut stands was performed 5-10 years after clear-cutting in south-central Sweden. Both the species composition and the richness of mosses and liverworts were affected by slash harvest, whereas the composition of vascular plants was not. Slash harvest also reduced richness of mosses and liverworts associated with forests and organic substrates (e.g. dead wood and litter). Species richness of vascular plants and bryophytes associated with inorganic substrates (i.e. mineral soil) was unchanged. Differences between conventionally harvested stands and slash-harvested stands were most likely a result of reduced cover of organic material reducing substrate availability and shelter in the latter. Increased mechanical disturbance in slash-harvested stands that destroys remnant forest vegetation and favours pioneers may also play a role. A bryophyte transplant experiment was performed in seven clear-cuts in central Sweden and monitored over one vegetation period. The results show that logging residues (or slash) and forest edges may shelter ground-dwelling bryophytes by buffering the clear-cut microclimate. In conclusion, both slope aspect and extraction of forest bioenergy affect plant survival in clear-cut boreal forests. As surviving plant populations facilitate re-colonisation, north-facing slopes and conventionally harvested clear-cuts (i.e. slash left) may potentially recover faster than south-facing slopes and slash-harvested clear-cuts.
APA, Harvard, Vancouver, ISO, and other styles
13

Åström, Marcus. "Aspects of heterogeneity : effects of clear-cutting and post-harvest extraction of bioenergy on plants in boreal forests /." Umeå : Department of Ecology and Environmental Science, Umeå University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-935.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Beckman, Marie. "Kvävestatus och risk för nitrifikation i två avverkade skogsområden i Halland." Thesis, Uppsala University, Department of Earth Sciences, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9282.

Full text
Abstract:

Nitrogen deposition leads to environmental damage in areas where the nitrogen deposition is high. Southwest Sweden receives an annual nitrogen deposition of up to 20 kg N/ha. Nitrogen that is not assimilated by the vegetation is accumulated in the soil, which may lead to nitrogen saturation and an elevated risk of nitrogen leaching. Nitrogen leaching from forest areas in southern Sweden has proven to be higher than from agricultural areas, which have been thought to be the main contributors to elevated nitrogen levels in rivers and lakes. The amount of nitrogen that leaches depends on the fraction of the total nitrogen in the soil that consists of nitrate, since nitrate is easily transported through the soil. Nitrogen leaching increases after clear-cutting since the uptake by vegetation is greatly reduced.

In this study the soil chemistry of two clear-cut spruce stands in Halland, in southwest Sweden, has been analyzed. A previous study in these areas has indicated higher nitrate concentrations in the groundwater in one of the areas and thus a greater nitrogen leaching. Nitrogen deposition in the two areas is estimated to be the same and therefore the soil chemistry has been analyzed to evaluate if differences in the soil can have resulted in differences in the nitrate concentration in the groundwater. The hypothesis is that the area with higher nitrate concentrations in the groundwater has properties more favorable for nitrification, which would be especially apparent in a lower carbon to nitrogen ratio. The pH and storage of nitrate, ammonium, total carbon, total nitrogen and exchangeable cations was analyzed in soil samples from both areas. In addition, a study of stand properties and previous use of the areas was made.

The analyses performed in this study indicate that the soil properties could not explain the differences in nitrate concentration in the groundwater. The differences found between the areas were that the area with lower nitrate concentrations in the groundwater had higher nitrate and ammonium concentrations and higher pH in the soil. The reason for this might be that the soil in this area has larger capacity to bind elements. The fact that the soil samples were sampled during different seasons probably had a major effect on these results. The history and stand properties of the two areas were similar. According to site index one area was more fertile, which benefits nitrification. This fact was not confirmed by the analyses, but it probably caused the nitrification rate to be higher in this area.


Det stora nedfallet av föroreningar i form av kväve i framförallt sydvästra Sverige leder till försurning och övergödning av både skogsmarker och vattendrag. Kvävedepositionen i södra Sverige kan uppgå till 20 kg N/ha och år. Det kväve som inte tas upp av vegetationen ackumuleras i marken som efterhand riskerar att bli kvävemättad vilket ökar risken för kväveutlakning. Kväveutlakningen från svenska skogsmarker har visat sig kunna vara i samma storleksordning som från jordbruksmarker som anses vara en av de största orsakerna till ökande kvävehalter i sjöar och vattendrag. Kväveutlakningens storlek beror till stor del på hur stor del av markens kväveförråd som finns i den oorganiska formen nitrat eftersom den är en lättrörlig jon. Efter skogsavverkning ökar nitratutlakningen betydligt på grund av att det finns väldigt lite vegetation kvar som tar upp kväveföreningarna.

I den här studien har markkemin i två avverkade granskogsområden i Halland undersökts. Tidigare studier i dessa två områden har visat att halterna av nitrat var högre i grundvattnet i det ena området än i det andra, och således var även nitratutlakningen större i detta område. Eftersom kvävedepositionen anses vara densamma i de två områdena har markemin undersökts för att finna skillnader där som kan förklara de olika nitratnivåerna i grundvattnet. Hypotesen var att det ena området skulle ha mer gynnsamma förhållanden för nitrifikation, framförallt en lägre C/N-kvot. Markens förråd av nitrat- och ammoniumkväve, totalkol, totalkväve, utbytbara katjoner samt pH undersöktes i båda områdena. En studie av områdenas historia gjordes även för att kunna utesluta skillnader där som kunde ge upphov till skillnaden i nitrat i grundvattnet.

Slutsatsen som kan dras från studien är att de analyserade egenskaperna inte visade på mer gynnsamma förhållanden för nitrifikation i det ena området än i det andra. Ingen skillnad i C/N-kvot uppmättes. Skillnaderna som hittades var att området med lägst halter av nitrat i grundvattnet hade högst halter av oorganiskt kväve i marken och högre pH. Att nitrathalterna var högre i grundvattnet men inte i marken kan ha sin förklaring i att marken i det ena området har större förmåga att binda till sig kväve vilket gör att det inte lika lätt kommer ut i grundvattnet. Antagligen spelade det stor roll för dessa resultat att jordproven tagits vid olika årstider. Undersökningen av tidigare användningsområde i skogarna visade att de hade en tämligen liknade historia. Det ena området har enligt ståndortsindex högre bördighet vilket gynnar nitrifikation. Detta framgick dock inte av analyserna men är antagligen orsaken till de högre nitrathalterna i grundvattnet i detta område.

APA, Harvard, Vancouver, ISO, and other styles
15

Lidman, Johan. "Hur påverkas bentiska funktionella födogrupper av kalavverkning? : Effekt på abundans, samt återhämning, av funktionella födogrupper efter kalavverkning kring små vattendrag." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-62180.

Full text
Abstract:
Forestry affects most of the forest-covered land in Sweden. In the landscape, the most common stream type is headwaters, which are important sites for many processes and organisms in both the terrestrial and the aquatic ecosystems. The aim of this study was to investigate how the abundance of benthic invertebrate functional feeding groups in headwater streams develops after clear-cutting and if it also is possible to detect a change in the composition of feeding groups. The study also attempts to determine what factors have an effect on temporal changes in abundance of these groups. For the study, 11 sites in northern Sweden were sampled for benthic invertebrates using a Surber-sampler, and for each site canopy-cover and pH was obtained. Further, the age of the surrounding forest at each was visually assessed and created a 100-year gradient along which temporal changes in abundance of the functional feeding groups were investigated. The results revealed that the total abundance of organisms was the highest short after clear-cutting and afterward decreased to the lowest level in streams with the highest age of surrounding forest. Significant results for the functional feeding groups were found for predators, shredders and scrapers, which also had the highest levels of abundance early after clear-cutting and thereafter decreased. The result shows that clear-cutting, not only changes the fundamental terrestrial conditions, but also has an impact on the abundance of different benthic functional feeding group.
APA, Harvard, Vancouver, ISO, and other styles
16

Mokonya, Ngomba Henry. "Diversity of vascular plants in Swedish forests. : Comparison among and within forest, partially cut down and clear cut forest communities." Thesis, Högskolan i Halmstad, Sektionen för ekonomi och teknik (SET), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-6063.

Full text
Abstract:
Swedish forests are mostly used for timber harvesting and 96 % of this harvesting is made by clear cutting while only 4 % is effected through other methods such as single tree harvesting. All species are not affected by forestry to same magnitude. Some specifically generalists are not affected at all. Hence, this study, had its aim to find out vascular plant species that persist, disappear or colonize other species as a result of anthropogenic disturbances in different production forests, so as to determine not only if canopy openness affects the species distribution but also the magnitude of the effects. I examined 10 different forest localities during May and June 2008. Three of these localities were made up of clear cut forest plots, 3 with partially cut down forest plots and 4 with undisturbed production forest plots. Species composition and diversity were then compared between these plots. A total of 34 different species were found. Statistical Analysis was made on how well the species in the partially cut down forest plots fitted into the undisturbed forest group as well as comparing this results with results of how counterpart species in the clear cut forest plots fitted into the undisturbed forest groups. These results showed that there was no significant difference, ANOVA values of P = 0.839, 0.602 and 0.564 respectively among the species composition between the forest, partially cut down and clear cut forest groups between the forest, partially cut down and clear cut forest plots. However, among the 54 species found in all study plots, 11 were common between the forest and partially logged sites whereas only Carex sp in the clear cut forest was common to those in the forest plots implying that canopy openness did not affect the total species number but had an effect in species composition. Clear cutting seems to kill off everything but trees and generalists. Hence, resiliency of vegetation should be increased by management practices that ensure the maintenance of prior species.
APA, Harvard, Vancouver, ISO, and other styles
17

Schmalholz, Martin. "Resistance and recolonization of bryophyte assemblages following disturbances : - detecting patterns and exploring mechanisms." Doctoral thesis, Stockholm : Department of Botany, Stockholm University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-38883.

Full text
Abstract:
Diss. (sammanfattning) Stockholm : Stockholms universitet, 2010.
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Submitted. Paper 3: Manuscript. Paper 4: Manuscript.
APA, Harvard, Vancouver, ISO, and other styles
18

Ranzini, Maurício. "Modelagem hidrológica de uma microbacia florestada da Serra do Mar, SP, com o modelo TOPMODEL : simulação do comportamento hidrológico em função do corte raso." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-29092015-090451/.

Full text
Abstract:
Utilizou-se o modelo hidrológico TOPMODEL, baseado em aspectos físicos e topográficos, em uma das três microbacias do Laboratório de Hidrologia Florestal Eng. Agr. Walter Emmerich, do Instituto Florestal/SP. O laboratório localiza-se na Serra do Mar, junto às cabeceiras do rio Paraibuna, um dos formadores do rio Paraíba do Sul. O modelo usa um índice topográfico que indica as áreas de contribuição para o deflúvio da microbacia e permite simular a vazão e analisar o comportamento hidrológico da microbacia. A primeira parte do trabalho buscou determinar os valores iniciais dos parâmetros de calibração, testar a validade das premissas do modelo, e, principalmente, compreender melhor o funcionamento hidrológico da bacia D. Os resultados indicam uma eficiência maior para as simulações de eventos isolados do que para as de períodos longos. A simulação do comportamento hidrológico em função do corte raso mostrou uma diminuição do tempo de pico e um aumento significativo do volume de vazão simulado: de 17 a 44%, em comparação a bacia D coberta com floresta. Mostram, também, que de 7 a 93% do deflúvio é gerado a partir das áreas variáveis de afluência (A.V.A.). Recomenda-se que o corte raso seja evitado a qualquer custo. Caso seja necessário, as matas ciliares devem ser mantidas; onde elas não existem mais, devem ser recuperadas imediatamente. As áreas com agricultura ou pastagem devem utilizar as melhores técnicas de conservação do solo, de forma que as condições naturais de infiltração não sejam drasticamente alteradas.
A physically based semi-distributed model, TOPMODEL, has been applied to one catchment in Cunha, São Paulo, Brazil. The model uses a topographic index which highlights significant hydrological areas within the catchment. The model simulate streamflow and analyse the behaviour of the catchment. The first part of this paper concerns to the first values of calibration parameters, experiments the validity of the premisses of the model, and, mainly, tries to understand how does the hydrology of D catchment works. The results are more efficient on simulation of isolate events than on events of long period. The simulation of hydrology behaviour subject to clear-cutting has showed a diminution of the time of rise and a significant increase of streamflow simulated: from 17 to 44%, in comparaison to D forest catchment. They also show that from 7 to 93% of the streamflow is generated from saturated contributing areas (sources areas). It\'s advisable to avoid clear-cutting. If necessary, the riparian zone has to be preserved; and where they have been destroyed, they have to be recovered urgently. Agricultural lands or grasslands have to use the best management practices, in order to keep the natural conditions of infiltration.
APA, Harvard, Vancouver, ISO, and other styles
19

Viding, Rasmus. "Effects of forest management on carbon sequestration." Thesis, Linköpings universitet, Biologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-176703.

Full text
Abstract:
The warming of our planet is a direct consequence of anthropogenic emissions with carbon dioxide as the main driver. A need to mitigate carbon emissions is urgent and forests can be a part of the solution since they sequester and stock carbon during their lifetime This study has shown that production forests can sequester carbon to a higher degree since they consist of younger trees which are better at sequestration than older trees. But the study also show that older forests keep sequestering carbon and might not be carbon neutral as previously thought. Old growth forests contain higher carbon stocks than younger production forests since they often remain unmanaged and can continuously accumulate carbon into living and dead biomass as well as the soil. Production forests also accumulate carbon, but it is not nearly the same amount as in old growth forests. With regard to meeting the 1,5-degree goal set by the IPCC, i.e., cutting emissions with half until 2030 and having net zero carbon dioxide emissions until 2050. Harvesting with clear-cutting was found to be worse compared with harvesting at a lower frequency which causes less emissions but still supplies wood products to the industry. The result also show that we must protect more old growth and unmanaged forests that can sequester and stock carbon longer to be able to succeed with the 1,5-degree goal. The debate climate in Sweden is heated and opinions often differ. The difference may depend on the time frame or how results are interpretated.
APA, Harvard, Vancouver, ISO, and other styles
20

Gedminas, Džiugas. "Kirtavietėse paliekamų pušies biologinės įvairovės medžių ilgalaikio išlikimo neigiamiems aplinkos veiksniams tyrimas Nemenčinės miškų urėdijoje." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140617_122440-84650.

Full text
Abstract:
Baigiamajame darbe aptariami kirtavietėse paliekamų pušies biologinės įvairovės medžių ilgalaikio išlikimo neigiamiems aplinkos veiksniams tyrimo rezultatai. Darbo tikslas – surinkti ir įvertinti Nemenčinės miškų urėdijos kirtavietėse paliekamų biologinės įvairovės medžių būklę, kiekį ir išlikimą kirtavietėje. Darbo objektas – plyno kirtimo biržės ir jose palikti biologinės įvairovės medžiai. Darbo metodika. Mokslinės literatūros analizės pagrindu teoriniu aspektu buvo gilinamasi į biologinės įvairovės svarbą ir jos apsaugos priemonių kūrimą bei taikymą. Šiam tikslui pasiekti studijuojamos lietuvių bei užsienio autorių knygos, moksliniai straipsniai, internetinė medžiaga, susijusi su nagrinėjama tema. Tyrimo metu buvo analizuojami keli parametrai: medžių atsparumas aplinkos poveikiams, medžių ilgalaikis išlikimas priklausantis nuo kirtavietės ploto, reljefo, paklotės storio. Darbo rezultatai. Tyrimo metu buvo susisteminta medžių paliekamų bioįvairovei tendencija. Buvo tirtos trijų skirtingų kirtimų metų šešios kirtavietės. Tyrimo metu nustatyta, kad į medžių paliekamų bioįvairovei būklę vis daugiau atsižvelgiama. Kirtimų metu paliekama vis didesnės įvairovės medžių, kurie atrenkami pagal normatyvus, kad būtų kuo ilgaamžiškesnis jų išlikimas. Nemenčinės miškų urėdijoje kirtavietėse po kirtimo praėjus daugiau nei 5 metams daugiausia išliko gyvybingų – žalių – medžių 77 proc. ir tik 23 proc. kitokių nudžiuvusių, nulaužtų ir išverstų medžių. Dauguma žalių medžių dažniausiai... [toliau žr. visą tekstą]
The master thesis presents the pine tree biodiversity and it‘s condition in the clear-felled area had been evaluated in forest areas. Aim of the work – assemble and evaluate the condition, quantity and survival of the trees, left for biological diversity in clear cutting areas in Nemenčinės forestry enterprise. Object of the work – The trees left for the biological diversity in clear cutting areas. Methods of the work – the theoretical aspect of the importance of biodiversity and its conservation and development of the application were analyzed in literature. To achieve this, the Lithuanian and foreign authors, books, scientific articles, online material related to the topic were studied. The study included the analysis of several parameters: tree resistance to environmental factors, long-term survival of the trees from harvesting area, terrain. Result of work - during the studies the biodiversity trend of the pine trees left in the wood clearcuts was structured. Six clearings in three different harvest years have been tested. It have been stated that more and more attention for the biodiversity is considered. During the clear cuttings bigger variety of the trees are left. These trees are selected according to the guidelines in order to make the more durable. After more than 5 years in the Nemenčinės forestry enterprise - the majority of trees in the clearcut forest - 77 % of them - are well growing, lush green trees. However, 23 % of the trees are dead, twisted or dumped... [to full text]
APA, Harvard, Vancouver, ISO, and other styles
21

Souza, Franciny Lieny. "Densidade de estradas em povoamentos de Pinus taeda l. em regime de desbastes e corte raso." Universidade do Estado de Santa Catarina, 2016. http://tede.udesc.br/handle/handle/2337.

Full text
Abstract:
Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2017-12-12T13:30:05Z No. of bitstreams: 1 PGEF16MA073.pdf: 1558252 bytes, checksum: 078f732c32622d0875732cff37fb28d7 (MD5)
Made available in DSpace on 2017-12-12T13:30:05Z (GMT). No. of bitstreams: 1 PGEF16MA073.pdf: 1558252 bytes, checksum: 078f732c32622d0875732cff37fb28d7 (MD5) Previous issue date: 2016-12-06
The objective of the present research was to analyze timber extraction operations and determining economically optimal density of forest roads in thinnings and clear cut for Pinus stands managed for multiple use, subsidizing the operations planning for forest sustainability. The survey was conducted in areas of harvest of Pinus taeda L., belonging to Florestal Gateados Ltda, in Campo Belo do Sul, SC. The study was divided into two stages. In the first, a technical analysis, modeling and cost productivity of logging activities in different situations and machines: (a) first thinning in cut to lenght system (CTL) with forwarder; (b) third roughing in CTL system with forwarder; (c) clear cut in with forwarder CTL system; and (d) clear cut in full tree system (FT) with skidder. Technical analysis was performed by means of a time and motion study, with a sampling error of less than 10%, being evaluated the elements of the operating cycle and given nominal productivity (Pn) and effective (Pe). The cost analysis was accomplished through the determination of production and operational costs for the accounting method. The operations were evaluated in different conditions of slope, direction of operation, distance of extraction, presence of rocky outcrop and volume by class tora, which were also regarded as independes variables to fit mathematical models for multiple regression for estimation of productivity, using the Stepwise Procedure. The main results were: for the first trim the Pn was 10,90 m3/h and total operating cost (COT) of R$/he. 181,12 For the third roughing the NP was 16,45 m3/h and COT of 185,58 R$/he. In clear cut, for forwarder if a Pn of 29,05 m3/h and COT of 244,58/he R$, while for the skidder obtained a Pn of 128,60 m3/h and COT of 218,31 R$/he. For the modeling of productivity of machines, the distance and the volume by tora were used as explanatory variables, being present in the estimates for the forwarder, in addition to the volume per cycle, in third, and slope in the first thinning and clear-cutting. For the skidder, the variables used were the distance and volume per cycle. In step two was given the economically optimum density (DOE) and acceptable (DAE) for different situations. The DOE was calculated by the indirect method, which is the product of the sum of the costs of reconstruction, maintenance, extraction and waste of productive area. First trim the current road density (of) was 45,28 m/ha, the DOE of 20,18 m/ha and the DAE of 28,26 m/ha. Third roughing the of was 95,08 m/ha, the DOE of 16,60 m/ha and the DAE of 21,68. In clear-cutting the of was 92,02 w/ha, being the DOE for the CTL system of 15,63 m/ha and DAE of 24,75 m/ha, while in the FT system DOE was 22,85 m/ha and 27,00 m DAE/ha. In General, the density of current roads was above the good and acceptable and should be carried out a redesign of operations targeting a road network within the acceptable density, resulting in lower costs and increased revenue to the company
O objetivo da presente pesquisa foi analisar operações de extração de madeira e determinar economicamente a densidade ótima de estradas florestais em desbastes e corte raso para povoamentos de Pinus manejados para uso múltiplo, subsidiando o planejamento das operações com vistas à sustentabilidade florestal. A pesquisa foi realizada em áreas de colheita de Pinus taeda L., pertencentes à empresa Florestal Gateados Ltda, em Campo Belo do Sul, SC. O estudo foi dividido em duas etapas. Na primeira, foi realizada uma análise técnica, de custos e modelagem da produtividade das atividades de extração de madeira em diferentes situações e máquinas: (a) primeiro desbaste em sistema de toras curtas (CTL) com forwarder; (b) terceiro desbaste em sistema CTL com forwarder; (c) corte raso em sistema CTL com forwarder; e (d) corte raso em sistema de árvores inteiras (FT) com skidder. A análise técnica foi realizada por meio de um estudo de tempos e movimentos, com um erro amostral menor que 10%, sendo avaliados os elementos do ciclo operacional e determinada a produtividade nominal (Pn) e efetiva (Pe). A análise de custos foi realizada através da determinação dos custos operacionais e de produção pelo método contábil. As operações foram avaliadas em diferentes condições de declividade, sentido de operação, distância de extração, presença de afloramento rochoso e classe de volume por tora, os quais também foram considerados como variáveis independes com intuito de se ajustar modelos matemáticos por regressão múltipla para a estimativa da produtividade, utilizando o procedimento Stepwise. Os principais resultados foram: para o primeiro desbaste a Pn foi de 10,90 m3/h e custo operacional total (COT) de 181,12 R$/he. Para o terceiro desbaste a Pn foi de 16,45 m3/h e COT de 185,58 R$/he. Em corte raso, para forwarder se obteve uma Pn de 29,05 m3/h e COT de 244,58 R$/he, enquanto que para o skidder se obteve uma Pn de 128,60 m3/h e COT de 218,31 R$/he. Para a modelagem da produtividade das máquinas, a distância e o volume por tora foram usadas como variáveis explicativas, estando presentes nas estimativas para o forwarder, além do volume por ciclo, em terceiro desbaste, e da declividade em primeiro desbaste e corte raso. Para o skidder, as variáveis utilizadas foram a distância e o volume por ciclo. Na etapa dois foi determinada a densidade economicamente ótima (DOE) e aceitável (DAE) para as diferentes situações de colheita. A DOE foi calculada pelo método indireto, sendo esta o produto do somatório dos custos de reconstrução, manutenção, extração e perda de área produtiva. Em primeiro desbaste a densidade de estradas atual (DE) foi de 45,28 m/ha, a DOE de 20,18 m/ha e a DAE de 28,26 m/ha. Em terceiro desbaste a DE foi de 95,08 m/ha, a DOE de 16,60 m/ha e a DAE de 21,68. Em corte raso a DE foi de 92,02 m/ha, sendo a DOE para o sistema CTL de 15,63 m/ha e DAE de 24,75 m/ha, enquanto que em sistema FT a DOE foi de 22,85 m/ha e DAE de 27,00 m/ha. De forma geral, a densidade de estradas atual foi acima da ótima e da aceitável, devendo ser realizado um replanejamento das operações visando uma malha viária dentro da densidade aceitável, resultando em menores custos e maiores receitas à empresa
APA, Harvard, Vancouver, ISO, and other styles
22

Morkūnas, Vilius. "Plynose kirtavietėse paliekamų biologinės įvairovės medžių būklės ir išlikimo analizė." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20090114_154549-48975.

Full text
Abstract:
Magistro darbe tiriama paliktų biologinei įvairovei medžių plyno kirtimo biržėse būklė ir išlikimas. Darbo objektas – plyno kirtimo biržės ir jose palikti biologinės įvairovės medžiai. Darbo tikslas – nustatyti plynose kirtavietėse paliekamų biologinės įvairovės medžių būklę, rūšinę sudėtį, kiekį ir pasiskirstymą bei išlikimą kirtavietėje. Darbo metodika – atliekant tyrimą, dėmesys buvo kreipiamas į du skirtingus parametrus. Pirmiausia buvo išsiaiškintas atskirų medžių atsparumas aplinkos poveikiams, priklausomai nuo jų individualių savybių. Kitas tyrimas, kuriame buvo apskaičiuota žuvusių medžių dalis kirtavietėje, priklausomai nuo kirtavietės parametrų ir medžių išsidėstymo joje. Darbo rezultatai – Plynose kirtavietėse vidutiniškai paliekama 11 medžių hektare, iš kurių per pirmuosius šešerius metus 14 procentų žūsta. Didėjant kirtavietės dydžiui bendras išlikimo procentas mažėja. Geriau išlieka grupėmis paliekami medžiai nei medžiai paliekami pavieniui. Didelę reikšmę medžių išlikimui turi vėjas - du trečdaliai žuvusių medžių žuvo dėl vėjo, buvo išversti arba nulaužti. Didžiausią poveikį vėjas turi medžiams, kurių paviršinė šaknų sistema, ir medžiams, kurių storio ir aukščio santykis mažesnis. Didėjant atstumui nuo kirtavietės krašto, dėl didesnio vėjo poveikio, medžių išlikimas mažėja. Atskirų medžių rūšių išlikimas priklauso nuo augavietės atitikimo medžių rūšiai ir paliekamų medžių individualių parametrų. Atrenkant paliekamus biologinei įvairovei medžius didesnis... [toliau žr. visą tekstą]
The master thesis presents evaluation of the trees condition and ability to survive, which are left for biological diversity in the clear cutting areas. Object of the work – trees left for biological diversity in clear cutting areas Aim of the work – to evaluate the condition, variety, quantity and layout of the trees, left for biological diversity in clear cutting areas. Methods of work- attention were paid to two different indicates: first, it has been investigated trees ability to resist environmental factors, depending on individual aspects of each tree. Second, it has been investigated area of coppice, where it was examined fraction of dead trees depending of trees layout and different factors in the coppice. Result of the work – there are approximately eleven trees left in each hectare and 14 percent of them do not survive during the first 6 years. The more the coppice expands the less possibility of tree to survive. The trees are more likely to survive when they are left in groups rather than on their own. The wind has important implication to the trees; two thirds of the trees get destroyed by the wind. The trees that are mostly in danger due to the wind are the ones that have roots spread out close to the ground surface and which have a reduced diameter and height ratio. Trees that are in the middle of the coppice have an increased risk to die from wind. Various trees survive depending on the type of the tree specification and its environmental... [to full text]
APA, Harvard, Vancouver, ISO, and other styles
23

Garcia, Lara Gabrielle. "Uso do corte raso em mosaico visando à redução dos efeitos hidrológicos em florestas plantadas." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-23042015-172810/.

Full text
Abstract:
A expansão das áreas de reflorestamento colocam em evidência os possíveis efeitos destas nos recursos hídricos. Tendo como principal característica o crescimento acelerado, as florestas plantadas apresentam elevadas taxas de evapotranspiração, e, embora não sejam consideradas usuárias de água, o consumo das mesmas modifica a produção de água na microbacia. Buscando entender este cenário, o objetivo do estudo foi identificar alternativas de corte raso em mosaico a serem utilizadas para mitigar os efeitos das florestas plantadas nos recursos hídricos. Foram testados variáveis de intensidade e configuração espacial do corte raso e seus efeitos obtidos por meio de simulações chuva-vazão na microbacia experimental de Itatinga. O estudo foi dividido em duas partes, a primeira foi referente à análise do consumo por meio da curva de permanência do deflúvio em diferentes cenários de intensidade de corte, e a segunda pela simulação hidrológica distribuída de cenários de corte variáveis tanto na intensidade quanto na localização. A partir dos resultados obtidos foram realizadas comparações com as vazões mínimas de referência (Q7.10 e Q90) para quantificação do consumo de água das florestas ao longo do tempo. Os resultados mostraram que quando totalmente coberta com floresta o consumo de água sempre ficava além do recomendado, conforme o corte da cobertura simulado era intensificado (até 100% de corte) os valores de consumo caiam, sendo que a partir de cinquenta porcento de corte o deflúvio ficava abaixo dos dois índices de vazão mínima de referência analisados. Na segunda parte do estudo os cenários de intensidade e localização do corte (30, 50 e 70% de corte nas cotas baixas e altas) foram comparados com a referência - cobertura total com floresta - e os resultados analisados quanto ao escoamento total, pico de vazão e volume dos eventos. Foi também simulado um cenário para a análise do efeito da vegetação ripária na redução dos impactos. Os resultados mostraram que os efeitos das diferentes intensidades de corte raso estão relacionados a altura total precipitada, pois apresentaram diferenças significativas para os menores eventos de chuva, não tendo as intensidades diferenças no corte para os maiores eventos (lâminas de chuva acima de 15 mm). A localização do corte nas cotas baixas da bacia resultou em picos de vazão e volume maiores do que o cenário referência para uma mesma intensidade de corte. Quando os cortes foram realizados nas cotas altas os resultados não diferiram significativamente do cenário referência em nenhuma porcentagem de corte, com exceção para a altura precipitada entre 4 e 8 mm. As simulações dos efeitos da floresta ripária mostraram que quando mantida ao longo do rio a vegetação diminui o escoamento direto, no entanto, este efeito depende da intensidade do evento de chuva, não sendo significativo para grandes eventos. Por meio dos dados foi possível concluir que o corte em mosaico é uma ferramenta que deve ser utilizada no manejo das florestas plantadas, pois por meio deste é possível diminuir o consumo através da intensidade e mitigar os efeitos do aumento do escoamento por meio da localização do corte.
The expansion of areas of planted forests shows possible effects they have on water resources. Due to the characteristics of accelerated growth, commercial reforestations have high rates of evapotranspiration. Although planted forests are not considered water users, their consumption modifies water production in the watershed. Seeking to understand this scenario, the objective of this study was to identify alternatives to clear-cutting in mosaic that can be used to mitigate the effects of planted forests in water resources. Variables of intensity and spatial configuration of clear-cutting and its effects obtained through rain-flow simulations were tested in the experimental watershed of Itatinga. The study was divided into two parts, the first consisted of the analysis of consumption through the flow permanence curve in different scenarios of cut intensity, and the second was characterized by hydrological simulation of distributed variable cutting scenarios both in intensity and in location. The results were used to compare with the minimum flow rates of reference (Q7.10 and Q90) to quantify water consumption of forests over time, measuring the relationship between consumption and minimum reference flow. The results showed that when fully covered with forest, water consumption was always beyond the recommended, and as the simulated cut of the vegetation cover was enhanced (until 100% cutting), consumption values dropped. After 50 percent of cutting, runoff remained below two rates of minimum flow reference analyzed. In the second part of the study, the scenarios of intensity and location of cuts (30, 50 and 70% of cut in downstream and upstream) were compared with reference - complete forest cover - and the results were analyzed in terms of total runoff, peak flow and volume of events. It was also simulated a scenario for the analysis of the effects of riparian vegetation on the reduction of impacts caused by the clear-cutting of the planted forest. The effects of different intensities of clear-cutting are related to the size of the event of rain, because they showed significant differences for smaller rain events, however, no differences in the intensities were observed for greater events (precipitation above 15 mm). The location of the cut in downstream scenarios resulted at peak flow and volume larger than the reference scenario for the same cut intensity. When the cuts were made in upstream, the results did not differ significantly from the reference scenario in any percentage of cut, except for the rain size between 4 and 8 mm. Simulations of the effects of riparian forest showed that when they are kept along the river, the vegetation decreases the direct runoff, however, this effect depends on the intensity of the rain event, not being significant for large events. The use of data allowed to conclude that the cut in mosaic is a tool that could be used in the management of planted forests, as it decreases consumption through intensity and mitigates the effects of increased runoff due to the location of the cut.
APA, Harvard, Vancouver, ISO, and other styles
24

Ronge, Victoria. "Sustainable Forestry? : A Sustainability Analysis of the Swedish Forest Sector Applying 'Backcasting from Sustainability Principles' as the Methodology." Thesis, KTH, Miljöstrategisk analys (fms), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200277.

Full text
Abstract:
Forests are key providers of terrestrial ecosystem services such as climate regulation, water purification, natural pest control, habitats for biodiversity, as well as different forms of wood based materials and food. Nevertheless forests are dangerously exposed to great pressures from various kinds of societal activities. This report examines the importance of forests for the (i) maintenance of life supporting functions of the biosphere as well as for (ii) providing a flexible resource base for the satisfying of human needs on more and more sustainability-driven markets. How can Swedish forestry be managed such that those two essential roles of forests become mutually supportive? The report also relates the results to three relevant and well-citied protocols for the subject: the Sustainable Development Goals in UN’s Agenda 2030, the Swedish Environmental Quality Objectives, and the Swedish National Forest Program. The approach applied Maxwell’s process design for qualitative research. Data have been collected from literature search and interviews of experts and the analytical instrument for modeling of data was the Framework for Strategic Sustainable Development (FSSD). The report concludes: Sustainable development for forestry relies on a paradigm shift in civilization’s perception of forestry to a practice where planning departures from envisioning a future where natural forest functions to sustain higher life forms and civilization are safeguarded and prioritized before other usages of forestland, and where diversity is enhanced in terms of tree age and species to foster more resilient and high-quality timber forests. When the above points are achieved, the higher diversity of more resilient forests should also have potential to supply markets with various kinds of resources offered to more and more sustainability driven markets. Furthermore, this development of society’s forest use increases the chances for civilization to be sustainable also with relatively smaller forest areas put aside for no forestry at all. In such a situation forestry and society have prioritized forest products and usages with long life spans before such with short. A future sustainable Swedish forest sector has recognized the above, and drawn an essential conclusion from it: the interdependency of forests with society’s overall sustainability performance calls for a cooperative approach that departures from an understanding of basic sustainability principles that are shared across sectors and disciplines. The Sustainable Development Goals, the Swedish Environmental Objectives and the Swedish National Forest Program all fail to take the above broad- systems perspective when it comes to proposing measures for the future, including how to advise further research to explore what the sustainable Swedish forestry could entail. The study arrives at pointing out an overall approach to analyses, planning and further research in those regards, rather than evaluating details on the path towards sustainable forestry.
Skogen är en nyckelresurs i den landbaserade naturen som förser samhället med ekosystemtjänster såsom klimatreglering, vattenrening, naturlig skadedjursbekämpning, habitat för biologisk mångfald, likväl som olika former av träfiberbaserade material och mat. Samtidigt är skogen hotad av kraftigt tryck från olika aktiviteter i samhället. Den här rapporten undersöker skogens betydelse för (i) upprätthållande av biosfärens livsuppehållande funktioner, samt som (ii) flexibel resurs när det gäller att förse mänskliga behov på alltmer hållbarhetsdrivna marknader. Hur bör skogen skötas så att dessa två roller stödjer varandra? Rapporten relaterar också resultaten till tre relevanta och vanligt citerade protokoll: hållbarhetsmålen i FNs Agenda 2030, de svenska miljömålen och det svenska nationella skogsprogrammet. Forskningen har strukturerats med hjälp av Maxwells process-design för kvalitativ forskning. Data har samlats in genom litteraturstudier och från intervjuer med experter. Modellering av data har gjorts genom att använda ramverket för strategisk hållbar utveckling (FSSD) som analysinstrument. Rapporten kommer fram till att: Hållbar utveckling för skogsbruket är beroende av ett paradigmskifte. En skogsskötsel där (i) planering utgår från att föreställa sig en framtid där skogens funktioner för högre liv på jorden är säkrade och satta före annan användning av skogsmark, och (ii) mångfald är främjad gällande trädens ålder och antalet arter så att mer resilienta skogar kan bidra med högkvalitativt timmer. När skogen förvaltas på det sättet så bör de mer diversa och resilienta skogarna ha möjlighet att förse marknader med olika resurser som kan visa sig vara viktiga på alltmer hållbarhetsdrivna marknader. Vidare borde denna utveckling av samhälles skogsanvändning öka chanserna för civilisationen att bli hållbar med relativt mindre ytor reserverade för att skyddas mot skogsbruk. Med en sådan förvaltning har skogsägare och samhället i stort prioriterat produkter och användningsområden med långa livslängder före sådana med korta livslängder. En framtida hållbar svensk skogssektor har insett allt ovanstående och dragit en väsentlig slutsats från det: beroendet mellan skogen och samhällets övergripande hållbarhetsarbete kräver samarbete utgående från grundläggande hållbarhetsprinciper som delas över sektors- och disciplingränser. Hållbarhetsmålen i Agenda 2030, de svenska miljömålen och det svenska nationella skogsprogrammet saknas alla ett tillräckligt brett systemperspektiv när det gäller att föreslå åtgärder för framtiden, inklusive att ge rekommendationer för framtida forskning om hållbart svenskt skogsbruk. Studien pekar snarare ut en övergripande inriktning för analyser, planering och forskning om hållbart svenskt skogsbruk, än utvärderar de exakta stegen på vägen dit.
APA, Harvard, Vancouver, ISO, and other styles
25

Hairabedian, Melissa Manuella. "The Short-term Impacts of Aspen Clear-cutting on Upland Groundwater Recharge." Master's thesis, 2011. http://hdl.handle.net/10048/1799.

Full text
Abstract:
The impacts of aspen clear-cutting on upland groundwater recharge are presented based on two years (2007-2008) of the five year (2005-2009) HEAD2 NSERC-CRD paired-catchment experiment. Research was conducted at the Utikuma Region Study Area (URSA), 370 km north of Edmonton, Alberta, Canada, in the Boreal Plain ecozone. Results show greater soil water content in the root zone and potential for recharge into the deeper unsaturated zone during the first year of regeneration. Sites with shallow water table levels (<600 cm) increased more than sites under uncut conditions. Sites with deeper water table levels (>600 cm) responded minimally, if at all, to spring-melt and summer storms suggesting that water exchanges with the atmosphere occurred to and from the unsaturated zone only during the first-year regeneration. Upland groundwater gradients to adjacent pond-peatland complexes persisted at least ten times longer under clear-cut than under uncut conditions. Water table trends recovered to uncut conditions by the second year of regeneration.
Ecology
APA, Harvard, Vancouver, ISO, and other styles
26

Heinrichs, Steffi. "Response of the understorey vegetation to selection cutting and clear cutting in the initial phase of Norway spruce conversion." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-B691-E.

Full text
APA, Harvard, Vancouver, ISO, and other styles
27

Chubbs, Tony Eldwood. "Responses of woodland caribou (Rangifer tarandus caribou) to clear-cutting in east-central Newfoundland." 1991. http://catalog.hathitrust.org/api/volumes/oclc/25257671.html.

Full text
Abstract:
Thesis (M.S.)--University of Wisconsin--Madison, 1991.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 18-30).
APA, Harvard, Vancouver, ISO, and other styles
28

Heinrichs, Steffi [Verfasser]. "Response of the understorey vegetation to selection cutting and clear cutting in the initial phase of Norway spruce conversion / vorgelegt von Steffi Heinrichs." 2010. http://d-nb.info/1009492896/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Cheng, Yi-Miao, and 陳怡妙. "Effects of block clear-cutting on dynamics of soil nutrients in Cryptomeria japonica stand at chitou." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/34257232311132639015.

Full text
Abstract:
碩士
國立中興大學
森林學系所
98
The purposes of this study were to compare changes of water chemistry for precipitation, throughfall, surface water, soil solution and soil properties in block clear-cutting and un-thinning in a Japanese cedan ( Cryptomeria japonica) stand in the Chitou Experimental Forest. We would like to understand the impact of small block clear-cutting on the nutrient dynamics of man-made stand. The amount of throughfall and rainfall interception in the un-thinning plots was 85% and 14.95%, respectively, of the bulk precipitation in the clear-cutting condition. The amount and sediment of suface water in un-thinning condition was higher than that in the clear-cutting condition. There was no significant difference (p>0.05) of pH value between clear-cutting (5.6) and un-thinning condition (5.5). The pH value of soil solution was lower than that of surface water in both conditions. In clear-cutting condition, the pH of soil solutions had no significant differences (p>0.05) between soil layers; as in un-thinning condition, the pH of soil solution increased with the increasing soil depth indicating that acid was buffered. The pH of solution at depth 45 and 60 cm below soil surface in un-thinning condition was higher than that of clear-cutting condition. The bulk precipitation in clear-cutting condition was dominated by NH4+ (524.77 μeq L-1) and NO3- (60.9 μeq L-1); in addition, the ion concentrations were lower than un-thinning condition. The result showed that the concentrations of Ca+2, Mg+2 and Cl- increased dramatically when rainwater flowed through the canopies. The ion concentrations of surface water in un-thinning condition were higher than in clear-cutting condition. Compared to the throughfall, all ion concentrations of surface water in clear-cutting condition increased, except H+. As NH4+ decreased, all the concentrations of inorganic ions increased, especially Ca+2 and Mg+2 when water entered the soil. The pH value and bulk density of the soil in clear-cutting condition were significantly higher than in un-thinning condition, however the total Kjeldahl nitrogen and CEC were lower. There were no significant differences in NH4+-N, NO3--N, the fresh soil moisture and available phosphorous between un-thinning and clear-cutting condition, but these figures varied as the season changes. In conclusion, the ion concentration of throughfall, surface water and soil solution at a depth of 45 cm slightly decreased after the man-made C. japonica stand was clear-cutting. Clear-cutting treatment resulted in a slight decrease in run-off and sediment of surface water. However, the water chemistry of both treatments tended to be similar in one year after small block clear-cutting, which indicated the block claear-cutting is still with good buffer capacity.
APA, Harvard, Vancouver, ISO, and other styles
30

STAŇKOVÁ, Pavla. "The effect of forest management and plant dominant on nitrogen transformation in soils of acidified mountain spruce forests in the Bohemian Forest National Park." Master's thesis, 2013. http://www.nusl.cz/ntk/nusl-166251.

Full text
Abstract:
The aim of this study was to compare and contrast mineral and microbial nitrogen concentrations in soils of semi-natural and natural mountain spruce forests in the Březník area, the Bohemian Forest National Park, under dead wood and four plant dominants with respect to different forest management after windstorm and bark beetle events applied in 1997.
APA, Harvard, Vancouver, ISO, and other styles
31

Klinck, Uwe. "Kohlenstoffvorrat, Nährstoffvorräte und Wasserdynamik nach forstlichen Eingriffen in Fichtenreinbestände." Doctoral thesis, 2009. http://hdl.handle.net/11858/00-1735-0000-0006-B12F-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Clear-cutting' for other source types:
Journal articles Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography