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Dissertations / Theses on the topic 'Soil respiration'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Iost, Susanne. "Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1201126765623-42870.

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Impacts of land use and climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained
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2

Iost, Susanne. "Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A24042.

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Impacts of land use and climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained
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3

Denton, Laura Elaine Scott. "Soil respiration at a Colorado subalpine forest." Diss., Connect to online resource, 2005. http://wwwlib.umi.com/dissertations/fullcit/3165811.

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4

Hartley, Iain P. "The response of soil respiration to temperature." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434021.

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5

Chang, Chao-Ting. "Soil water availability regulates soil respiration temperature dependence in Mediterranean forests." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/406082.

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The variations of ecosystem and soil respiration are mainly driven by temperature and precipitation, but the importance of temperature and precipitation could vary across temporal and spatial. At diurnal to annual temporal scales, ecosystem and soil respiration generally increase with average annual temperature, but very low or very high soil moisture has been shown to diminish the temperature response of respiration. Therefore, in water-limited ecosystem, such as the Mediterranean region where the seasonal pattern is characterized with significant summer drought, precipitation patterns are li
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6

Burns, Nancy Rosalind. "Soil organic matter stability and the temperature sensitivity of soil respiration." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/9922.

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Soil respiration is an important source of atmospheric CO2, with the potential for large positive feedbacks with global warming. The size of these feedbacks will depend on the relative sensitivity to temperature of very large global pools of highly stable soil organic matter (SOM), with residence times of centuries or longer. Conflicting evidence exists as to the relationships between temperature sensitivity of respiration and stability of SOM, as well as the temperature sensitivity of individual stabilisation mechanisms. This PhD considers the relationship between different stabilisation mech
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7

Murray, Sam. "Development of a soil respiration isotopic sampling system." Thesis, University of Canterbury. School of Biological Sciences, 2014. http://hdl.handle.net/10092/9652.

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The rate of carbon turnover in soil is a balance between the input of carbon by plants through their roots and associated fungi and the loss of carbon due to plant and microbial respiration, oxidation and leaching. Soil carbon dynamics are notoriously difficult to measure, and being able to separate total soil respiration into its autotrophic and heterotrophic components would help understanding of carbon cycling processes. Where autotrophic respiration originates from roots and their associated mycorrhizal fungi, using newly fixed carbon, and heterotrophic respiration originates from the brea
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8

Kuntz, Marianne. "Carbon : an important regulator of denitrification in arable soil." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=232081.

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Carbon (C) as a driver of soil denitrification was investigated in a series of four laboratory incubation experiments employing stable nitrogen (N) and C isotope approaches. The research addressed the lack of knowledge on mechanisms through which the quantity and quality of organic‐C containing substrates interact with denitrification. The amount of organic matter added to soil was manipulated to relate C respiration with process rates of denitrification. Respiration derived from dissolved organic matter C was linearly related to denitrification but the direction of the relationship was variab
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9

Boström, Björn. "Achieving carbon isotope mass balance in Northern forest soils, soil respiration and fungi /." Örebro : Department of Natural Sciences, Örebro University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2101.

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10

Flynn, Conor R. "Soil Respiration Response to Disturbance in a Northern Michigan Forest." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1336919672.

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11

Neilson, Julia Killian Worsley 1958. "Microbial respiration as an index of soil aeration in compacted and sewage sludge amended soils." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/191287.

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The use of liquid sewage sludge on agricultural soils may improve productivity, but cause compaction due to an application procedure requiring multiple passes with heavy machinery. The movement of water through the soil profiles was used as an index indicating a greater degree of compaction in soils amended with high amounts of sewage sludge vs. low amounts or inorganic fertilizer. Laboratory studies developed a method to utilize CO 2 evolution from microbial respiration as an index of soil aeration. Samples of Pima clay loam soil of varying moisture levels were amended with inorganic fertiliz
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12

De, Remy De Courcelles Vivien. "Studies of soil respiration in eucalypt forests of south east Australia." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/10422.

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This thesis addresses gaps in knowledge of soil respiration in forests of south-east Australia. Soil respiration plays a major part in the cycle of carbon between soils - the biggest pool of terrestrial carbon - and the atmosphere. Despite its global significance, we have only a limited understanding of the magnitude and responses of soil respiration, and especially of its components, to abiotic (temperature, moisture, soil fertility) and biotic (photosynthesis, seasonality of belowground C allocation patterns and root growth, quality and quantity of above and belowground litter) controls. Fur
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13

Esberg, Camilla. "Phosphorus availability and microbial respiration across biomes from plantation forest to tundra /." Doctoral thesis, Umeå : Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-33732.

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14

Selig, Marcus Franklin. "Soil Co2 Efflux and Soil Carbon Content as Influenced by Thinning in Loblolly Pine Plantations on the Piedmont of Virginia." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/33866.

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The thinning of loblolly pine plantations has a great potential to influence the fluxes and storage of carbon within managed stands. This study looked at the effects of thinning on aboveground carbon and mineral soil carbon storage, 14-years after the thinning of an 8-year-old loblolly pine plantation on the piedmont of Virginia. The study also examined soil respiration for one year following the second thinning of the same stand at age twenty-two. The study was conducted using three replicate .222 hectare stands planted using 3.05 by 3.05 meter spacing in 1980 at the Reynolds Homestead in
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15

Russell, Kerri Ann. "Microbial and Environmental Drivers of Soil Respiration Differ Along Montane to Urban Transitions." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7718.

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In natural ecosystems, like deciduous and coniferous forests, soil CO2 flux or soil respiration is highly variable and influenced by multiple factors including temperature, precipitation, dissolved soil organic carbon (DOC), dissolved organic matter (DOM), and bacterial and fungal biomass and diversity. However, as the human population continues to grow rapidly, so too do urbanized landscapes with unknown consequences to soil respiration. To determine the extent urbanization influences seasonal shifts in microorganisms and environmental drivers alter soil respiration, we evaluated bacterial an
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16

Wiseman, P. Eric. "Soil Carbon Dioxide Efflux Across Four Age Classes Of Plantation Loblolly Pine (Pinus taeda L.)On The Virginia Piedmont." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/35770.

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Soil carbon dioxide efflux resulting from microbial and root respiration is a major component of the forest carbon cycle. We undertook this investigation to better understand the nature of soil carbon dioxide efflux of plantation loblolly pine, an important ecological and economical resource in the southeastern United States. Specifically, we hoped to learn how soil carbon dioxide efflux differs both spatially and temporally for four age classes of plantation loblolly pine on the Virginia piedmont. During a 12-month period, soil carbon dioxide efflux was repeatedly measured for four age cla
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17

Hu, Duan. "Soil respiration following alternative site preparation treatments in a boreal mixedwood forest." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ33389.pdf.

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18

Maher, Ryan Matthew. "Soil respiration and plant growth across a chronosequence of tallgrass prairie reconstructions." [Ames, Iowa : Iowa State University], 2007.

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19

Nietz, Jennifer Goedhart. "Soil Respiration During Partial Canopy Senescence in a Northern Mixed Deciduous Forest." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276543755.

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20

Xu, Jianye. "Interannual Dynamics of Soil Respiration in Managed Oak Forests in Missouri Ozarks." University of Toledo / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1251397682.

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21

Knox, Oliver Gimli Gunning. "Exploiting nitrate respiration to optimise antagonistic control of root disease in soil." Thesis, University of Aberdeen, 2000. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602312.

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In soils of high matric potential, low oxygen conditions often develop that favour disease development by many soil-borne plant pathogens. The introduction of a third party, or biocontrol agent, to suppress disease development would require that the agent remains metabolically active under such conditions. In the rhizosphere, plant roots not only supply carbon as an electron donor but cause a localised lowering of oxygen concentrations, conditions favourable for nitrate respiration. The effect of the addition of nitrate on the activity of antagonistic strains of Bacillus subtilis, Pseudomonas
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22

Moyano, Fernando Esteban. "Soil respiration fluxes and controlling factors in temperate forest and cropland ecosystems." [S.l. : s.n.], 2007.

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23

Xu, Jianye. "Interannual dynamics of soil respiration in managed oak forrests in Missouri Ozarks /." Connect to full text in OhioLINK ETD Center, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1251397682.

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Thesis (M.S.)--University of Toledo, 2009.<br>Typescript. "Submitted as partial fulfillment of the requirements for the Master of Science in Biology." "A thesis entitled"--at head of title. Bibliography: leaves 48-55.
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24

Wong, Vanessa, and u2514228@anu edu au. "The effects of salinity and sodicity on soil organic carbon stocks and fluxes." The Australian National University. Faculty of Science, 2007. http://thesis.anu.edu.au./public/adt-ANU20080428.223144.

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Soil is the world’s largest terrestrial carbon (C) sink, and is estimated to contain approximately 1600 Pg of carbon to a depth of one metre. The distribution of soil organic C (SOC) largely follows gradients similar to biomass accumulation, increasing with increasing precipitation and decreasing temperature. As a result, SOC levels are a function of inputs, dominated by plant litter contributions and rhizodeposition, and losses such as leaching, erosion and heterotrophic respiration. Therefore, changes in biomass inputs, or organic matter accumulation, will most likely also alter these levels
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25

Tyree, Michael Christopher. "The Short-term Effects of Fertilization on Total Soil CO2 Efflux, Heterotrophic, and Autotrophic Respiration of Loblolly Pine (Pinus taeda L.)." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34944.

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<p>Fertilization is a common, cost effective treatment for increasing forest productivity within managed forests of the southeastern United States. However, little is known about how fertilization affects the below-ground processes that drive soil CO2 efflux in loblolly pine (Pinus taeda L.). A thorough understanding of below-ground carbon dynamics is necessary for the estimation of net ecosystem productivity and the carbon storage potential of these managed systems. </p><p> In April 2004, we began monitoring total soil CO2 efflux (EC), heterotrophic (RH), and root respiration (RR) in resp
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26

Nichols, Lara Kaitlin. "Relationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped System." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51945.

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The components of soil CO2 efflux are affected by many soil properties including temperature, moisture, microbial abundance and activity, and other soil physical and chemical properties. Changes in these factors can result in high spatial and temporal variability of total soil CO2 efflux. Low molecular weight organic acids (LMWOAs), dissolved organic carbon (DOC) and dissolved organic nitrogen (DON), microbial biomass and activity were measured to evaluate the impact of intercropping switchgrass (Panicum virgatum L.) in a loblolly pine (Pinus taeda L.) plantation. Surface soil samples (0-15 cm
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27

Comstedt, Daniel. "Explaining temporal variations in soil respiration rates and delta13C in coniferous forest ecosystems." Doctoral thesis, Örebro universitet, Institutionen för naturvetenskap, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-2055.

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Soils of Northern Hemisphere forests contain a large part of the global terrestrial carbon (C) pool. Even small changes in this pool can have large impact on atmospheric [CO2] and the global climate. Soil respiration is the largest terrestrial C flux to the atmosphere and can be divided into autotrophic (from roots, mycorrhizal hyphae and associated microbes) and heterotrophic (from decomposers of organic material) respiration. It is therefore crucial to establish how the two components will respond to changing environmental factors. In this thesis I studied the effect of elevated atmospheric
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28

Smith, Daniel Robert. "Soil respiration in a fire scar chronosequence of Canadian boreal jack pine forest." Thesis, University of Leicester, 2009. http://hdl.handle.net/2381/8268.

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This research investigates soil respiration (Rs) in a boreal jack pine (Pinus banksiana Lamb.) fire scar chronosequence at Sharpsand Creek, Ontario, Canada. During two field campaigns in 2006 and 2007, Rs was measured in a chronosequence of fire scars in the range 0 to 59 years since fire. Mean Rs adjusted for soil temperature (Ts) and soil moisture (Ms) (Rs T,M) ranged from 0.56 μmol CO2/m2/s (32 years post fire) to 8.18 μmol CO2/m2/s (58 years post fire). Coefficient of variation (CV) of Rs adjusted for Ts and Ms ranged from 20% (16 years post fire) to 56% (58 years post fire). Across the fi
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29

Jian, Jinshi. "Global soil respiration: interaction with macroscale environmental variables and response to climate change." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/92195.

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The response of global soil respiration (Rs) to climate change determines how long the land can continue acting as a carbon sink in the future. This dissertation research identifies how temporal and spatial variation in environmental factors affects global scale Rs modeling and predictions of future Rs under global warming. Chapter 1 describes the recommend time range for measuring Rs across differing climates, biomes, and seasons and found that the best time for measuring the daily mean Rs is 10:00 am in almost all climates and biomes. Chapter 2 describes commonly used surrogates in Rs modeli
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Sawada, Kozue. "Quantitative Analysis of Soil Microbial Respiration using a Concept of Stepwise Substrate Utilization." Kyoto University, 2010. http://hdl.handle.net/2433/120465.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第15422号<br>農博第1807号<br>新制||農||979(附属図書館)<br>学位論文||H22||N4521(農学部図書室)<br>27900<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授 舟川 晋也, 教授 二井 一禎, 教授 北山 兼弘<br>学位規則第4条第1項該当
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Jenkins, Meaghan Edith Biological Earth &amp Environmental Sciences Faculty of Science UNSW. "Carbon cycling in sub-alpine ecosystems." Awarded by:University of New South Wales. Biological, Earth & Environmental Sciences, 2009. http://handle.unsw.edu.au/1959.4/44822.

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The relationship between temperature and soil respiration has been well explored although uncertainties remain. This thesis examined the relationship between temperature and rates of heterotrophic respiration in soils from three adjacent sub-alpine Australian vegetation types; woodland, shrubland and grassland. Temperature sensitivity of soil (Q10) has recently been a hotly debate topic, one side concluding that decomposition of recalcitrant, less labile components of soil organic matter are insensitive to temperature. Whilst others argue that there is no difference in the temperature sensitiv
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32

Stielstra, Clare M. "Quantifying the Role of Hydrologic Variability in Soil Carbon Flux." Thesis, The University of Arizona, 2012. http://hdl.handle.net/10150/238914.

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Soil carbon (C) is the largest terrestrial carbon pool. While inputs to this system are fairly well constrained, the diverse factors driving soil C efflux remain poorly understood. Carbon in surface soils is mobilized via two distinct pathways: CO₂ gas flux and dissolved C flux. The goal of this study was to quantify the role of hydrologic variability in mobilizing carbon as gaseous and dissolved fluxes from near-surface soils, and to determine their relative magnitudes. Data were collected through 2010 and 2011 from two subalpine sites in Arizona and New Mexico. I observed no significant vari
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33

Al, Fassi Fahad Abdulrahman. "The microbial ecology of heathland soil with special reference to factors affecting microbial biomass and activity." Thesis, University of Sheffield, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318137.

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34

Rühr, Nadine Katrin. "Soil respiration in a mixed mountain forest : environmental drivers and partitioning of component fluxes /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18297.

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35

Murphy, Meaghan Thibault. "Biotic and abiotic controls on soil respiration in a biodiversity plantation in the tropics." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97978.

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The Sardinilla plantation is a long-term facility for studying the links between tree species diversity and ecosystem function. Six native tree species were planted in 2001 in plots containing 1, 3 or 6 species. Soil respiration (SR) measurements were conducted from March to December 2004 on tree pairs. ANOVAs with repeated measure on days were used to test the main effects of species (monocultures), pair (single and two-species pairs), plot (pairs in monoculture, three-, and six-species plots), and season (dry vs. early wet season). ANCOVAs were run for each effect to determine possible bioti
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36

Wright, Caroline. "Multiple Substrate-Induced Respiration and Isothermal Calorimetry : Applicability in Risk Assessment of Contaminated Soil." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-321192.

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At present, soils face great threats. Consequences of human activities, such as climate change, acidification and contamination result in decreased soil health. This is a threat to human health and well-being, since our society is dependent on soil ecosystem services. The soil ecosystems provide resources, such as food and fresh water, regulate the climate and play key parts in important life supporting biological processes, e.g. cycling of carbon and nutrients. Due to increased awareness of the threats that soils face, and its importance to humans, soil quality monitoring has recently receive
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37

Almeida, Risely Ferraz [UNESP]. "CO2 emission and O2 uptake of soil under different systems." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/149886.

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Submitted by RISELY FERRAZ ALMEIDA (rizely@gmail.com) on 2017-03-22T01:11:45Z No. of bitstreams: 1 Tese_Risely_Ferraz_Almeida.pdf: 1907638 bytes, checksum: 54826ce5c26a680dbbfdb607f7d4cad5 (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-03-22T20:23:04Z (GMT) No. of bitstreams: 1 almeida_rf_dr_jabo.pdf: 1907638 bytes, checksum: 54826ce5c26a680dbbfdb607f7d4cad5 (MD5)<br>Made available in DSpace on 2017-03-22T20:23:04Z (GMT). No. of bitstreams: 1 almeida_rf_dr_jabo.pdf: 1907638 bytes, checksum: 54826ce5c26a680dbbfdb607f7d4cad5 (MD5) Previous issue d
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Dennis, Wilson Dennis. "Estimation of Carbon Dioxide emissions from forest soils based on CO2 concentrations." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-33240.

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Forest soil is an important source of atmospheric CO2. Emission of CO2 from soil is the result of respiration of plant roots and soil organisms (Autotrophic and Heterotrophic respiration). This soil CO2 emission has a variation throughout the year with maximum emissions being in the summer. However, the seasonal variation affected by the external factors is not fully known. The aim of this thesis is to analyze a relationship between concentration of CO2 in the soil-atmosphere and CO2 emissions to the aboveground atmosphere. When knowing the relationship between CO2 concentration in the soil-at
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Gough, Christopher Michael. "Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/11232.

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Loblolly pine (Pinus taeda L.) occupies 13 million hectares in the United States and represents a critical component of the global carbon (C) cycle. Forest management alters C dynamics, affecting the C sequestration capacity of a site. Identifying drivers that influence C cycling, quantifying C fluxes, and determining how management alters processes involved in C cycling will allow for an understanding of C sequestration capacity in managed forests. Objectives of the first study included (1) investigating environmental, soil C, root, and stand influences on soil CO2 efflux on the South Caro
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Oliver, Viktoria. "The effect of land-use on soil organic carbon dynamics in the Peruvian Andes." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7064.

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Soil carbon storage in tropical ecosystems is important in the global carbon cycle, yet consensus is lacking on how soil organic carbon stocks are altered under anthropogenic land-use change. This thesis seeks to quantify soil carbon stocks, the associated soil carbon emissions and explores the drivers of soil respiration in managed tropical Andean lands over a 2600 m elevation gradient. It investigates: grazing and burning on high altitude montane grasslands, burning in montane forests and agriculture in premontane forests. Changes among land-uses were quantified using belowground carbon stoc
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41

YAMAZAWA, Hiromi, Jun MORIIZUMI, Masashi HACHIYA, 弘実 山澤, 純. 森泉 та 真史 蜂谷. "炭素同位体比を用いた森林土壌呼吸中の根呼吸の評価". 名古屋大学年代測定資料研究センター, 2010. http://hdl.handle.net/2237/14743.

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42

Reynolds, Lorien. "Soil-Climate Feedbacks: Understanding the Controls and Ecosystem Responses of the Carbon Cycle Under a Changing Climate." Thesis, University of Oregon, 2016. http://hdl.handle.net/1794/20465.

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Soil organic matter (SOM) decomposition and formation is an important climate feedback, with the potential to amplify or offset climate forcing. To understand the fate of soil carbon (C) stores and fluxes (i.e., soil respiration) under future climate it is necessary to investigate responses across spatial and temporal scales, from the ecosystem to the molecular level, from diurnal to decadal trends. Moreover, it is important to question the assumptions and paradigms that underlie apparently paradoxical evidence to reveal the true nature of soil-climate feedbacks. My dissertation includes re
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43

Pangle, Robert E. "Soil Carbon Dioxide Efflux in Response to Fertilization and Mulching Treatments in a Two-Year-Old Loblolly Pine (Pinus taeda L.) Plantation in the Virginia Piedmont." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/36359.

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Due to concern over the increasing concentration of carbon dioxide in the atmosphere, forest researchers and managers are currently studying the effects of varying silvicultural and harvesting practices on the carbon dynamics of intensely managed forest ecosystems. Soil carbon dioxide efflux resulting from soil microbial activity and root respiration is one of the major components of the total carbon flux in forested ecosystems. In an effort to examine the response of soil carbon dioxide efflux to changes in soil factors, nutrient availability, temperature, and moisture, soil respiration rate
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44

McElligott, Kristin Mae. "Soil Respiration and Decomposition Dynamics of Loblolly Pine (Pinus taeda L.) Plantations in the Virginia Piedmont." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/75154.

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Forests of the southeastern U.S. play an important role in meeting the increasing demand for forest products, and represent an important carbon (C) sink that can be managed as a potential tool for mitigating atmospheric CO2 concentrations and global climate change. However, realizing this potential depends on full accounting of the ecosystem carbon (C) budget. The separate evaluation of root-derived, autotrophic (RA) and microbially-derived heterotrophic (RH) soil respiration in response to management and climate change is important, as environmental and ecological factors often differentiall
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45

Heim, Brett Christopher. "Partitioning soil respiration in response to drought and fertilization in loblolly pine: laboratory and field approaches." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/25757.

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An understanding of ecosystem-level carbon (C) sequestration, or net ecosystem production (NEP), requires the separation of heterotrophic, microbial respiration (RH) from autotrophic, root-derived respiration (RA) as the components of RS (i.e., NEP = NPP - RH). However, separating these two sources in situ has been problematic since they are closely coupled. This study utilizes two similarly aged Pinus taeda L. stands, 8 and 9 years-old, aimed at quantifying these two respiration components through in-situ root severing. In order to use root-severing treatments to separate RS into RH and RA co
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46

Stark, S. (Sari). "Reindeer grazing and soil nutrient cycling in boreal and tundra ecosystems." Doctoral thesis, University of Oulu, 2002. http://urn.fi/urn:isbn:9514266927.

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Abstract In northernmost Fennoscandia, grazing by reindeer (Rangifer tarandus L.) has a substantial impact on the vegetation of boreal forests and arctic-alpine tundra heaths, which are reflected in below-ground processes, such as nutrient mineralization and soil organic matter decomposition. In the present thesis, the effects of reindeer grazing on soil nutrient cycling were studied by comparing grazed situation with an ungrazed control area in ten boreal forests and six arctic-alpine tundra heaths. In boreal forests, reindeer grazing reduced microbial respiration in both the oligotr
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47

Andersson, Stefan. "Influence of liming substances and temperature on microbial activity and leaching of soil organic matter in coniferous forest ecosystems /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5850-1.pdf.

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48

Teixeira, Daniel De Bortoli [UNESP]. "Incertezas na estimativa da variabilidade espacial da emissão de CO2 do solo e propriedades edáficas em área de cana crua." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/88232.

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Made available in DSpace on 2014-06-11T19:23:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-12-22Bitstream added on 2014-06-13T19:49:59Z : No. of bitstreams: 1 teixeira_db_me_jabo.pdf: 508270 bytes, checksum: 93d2af6f4bf67e9aab6a84ffe3f4ac1a (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>A emissão de CO2 do solo (FCO2) apresenta alta variabilidade espacial, sendo devida a grande dependência espacial existente nas propriedades do solo que a influenciam. Neste estudo objetivou-se (i) caracterizar e relacionar a variabilidade e a distribuição espacial
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49

Hammer, Rachel Lynn. "Soil Respiration and Related Abiotic and Remotely Sensed Variables in Different Overstories and Understories in a High Elevation Southern Appalachian Forest." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93272.

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Forests have the ability to sequester carbon from our atmosphere. Soil respiration (Rs) plays a role in a forest's ability to do so as it is a significant source of carbon dioxide back to the atmosphere. Therefore, understanding the process of Rs under varying conditions is gaining more attention. As of now we have a relatively good understanding of Rs under managed forest ecosystems such as pine plantations. This particular study examined Rs under different overstories and understories in a high elevation Southern Appalachian forest in order to get a better understanding of Rs under a natural
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50

Zamora-Ledezma, Ezequiel. "Evidences for an indirect effect of root functional traits and plant composition on soil microbial activities in Mediterranean rangelands : a spatial and temporal approach." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20176/document.

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Il est de plus en plus admis que pour comprendre le fonctionnement des écosystèmes, une approche aérienne associée à une approche souterraine est nécessaire en raison des rétroactions entre plantes et sol. La structure des communautés végétales peut affecter le fonctionnement du sol en altérant la quantité et la qualité des ressources intégrant le sol. Les contrôles abiotiques des processus microbiens du sol sont largement documentés, mais les potentiels effets de la composition de la communauté végétale et des traits racinaires sont peu connus. L'étude a été menée sur des prairies méditerrané
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