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Journal articles on the topic 'Permanent sample plots'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Allen, Micky G., and Harold E. Burkhart. "A comparison of alternative data sources for modeling site index in loblolly pine plantations." Canadian Journal of Forest Research 45, no. 8 (2015): 1026–33. http://dx.doi.org/10.1139/cjfr-2014-0346.

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Site index curves are generally developed from one of three data sources: (i) permanent sample plots, (ii) temporary sample plots, or (iii) stem analysis data. Permanent sample plots are considered to be the best data source for modeling height–age relationships; however, due to time and cost constraints, analysts may consider using temporary sample plots or stem analysis data for equation fitting. Temporary sample plot and stem analysis data, although more quickly obtained, require assumptions that are often not met when modeling site index. The question becomes how models developed from temp

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2

Burgess, Darwin, and Craig Robinson. "Canada's oldest permanent sample plots — thinning in white and red pine." Forestry Chronicle 74, no. 4 (1998): 606–16. http://dx.doi.org/10.5558/tfc74606-4.

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Two of the oldest permanent sample plots (PSPs) in Canada were set up at Petawawa, Ontario (45° 57′ N, 77° 34′ W) to examine the effect of thinning on the development of natural white (Pinus strobus L.) and red pine (Pinus resinosa Ait). Field data were collected periodically, starting in 1918 when the stand was 40 years old and continuing for 71 years. Six thinning treatments were completed, beginning in 1918, and then in 1933, 1941, 1959, 1969 and 1989. The intensity of thinning varied through time with 14, 27, 38, 8, 30, and 7% of the basal area removed. The sawlog volume mean annual increm

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3

YAMAMOTO, Takeshi, Maho KUDOU, Koji FUJIMOTO, Norihiro KAJIHARA, and Mikihiro KAJIHARA. "Tree distribution pattern in the permanent sample plots of selection forests." Japanese Journal of Forest Planning 29 (1997): 77–84. http://dx.doi.org/10.20659/jjfp.29.0_77.

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4

Schmid-Haas, Paul. "Die Idee der Kontrollstichproben: ihre Entstehung und ihre Zukunft | The Swiss Continuous Forest Inventory: its genesis and its future." Schweizerische Zeitschrift fur Forstwesen 154, no. 3-4 (2003): 102–11. http://dx.doi.org/10.3188/szf.2003.0102.

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For planning and control we need information on the actual condition of the forest, its changes, increment and drain. Information on the actual condition is most often gained in an optimal way by mixed samples of temporary and permanent plots. For information on changes in the condition permanent sample plots are more efficient, for information on increment and drain permanent sample plots are necessary anyway. Permanent plots must be relocatable. For visible permanent plots,however, nobody knows if they are treated in exactly the same way as the rest of the forest. In the long run it becomes

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5

Xu, Yun, Feng Ri Li, and Shi Lei Jiang. "Study on Diameter Distribution of Natural Secondary Forest." Advanced Materials Research 402 (November 2011): 758–65. http://dx.doi.org/10.4028/www.scientific.net/amr.402.758.

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This study used 45 permanent sample plots investigated in 2007 and 6 permanent sample plots investigated in 2008 in Mao’er Mountain natural secondary forest area and 68 permanent plots investigated in 2008 in Niuxinshan institute in Muling. Through making the chat of diameter distribution histogram the analysis of diameter distribution, use a variety of distribution functions to fit the transformation regularities, set up parameter regression model. Research results show: the fitting effects of exponential distribution and Weibull distribution are good, and exponential distribution is better.

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Siddqui, Asm, and Akramul Islam. "Population Dynamics of major Mangrove species in the Sundarbans, Bangladesh." Indian Journal of Forestry 42, no. 4 (2019): 317–22. http://dx.doi.org/10.54207/bsmps1000-2019-8l2tin.

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Growth dynamics of major mangrove species in three salinity zones of the Sundarbans was conducted by establishing permanent sample plots (PSPS) by the Mangrove Silviculture Division of the Bangladesh Forest Research Institute. Multistage sampling process was applied to collect data from 33 Permanent Sample Plots (PSPs), area of each PSP being 400 m2. Total number of seedlingh, saplings in each saline zone and total regeneration percentage of each species in the PSPs was worked out.

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Rachana, A. G. Koppad, Dinesh CV, Pracheeka J. Shetty, and Gowri B. Gowda. "Evaluating Annual Growth Dynamics Across Forest Types Using Permanent Sample Plots in Yellapur Forest Division, Karnataka, India." Journal of Scientific Research and Reports 31, no. 1 (2025): 145–52. https://doi.org/10.9734/jsrr/2025/v31i12753.

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Annual tree increment requires repeated assessments on permanent sample plots, which are crucial for evaluating changes in tree size and stem volume. These plots enable long-term monitoring to estimate timber production and analyse growth dynamics. This study examines the current annual increment of growth parameters like tree height, GBH, basal area, and volume in dry, moist deciduous, and semi-evergreen forests within the Yellapur Forest Division, Uttara Kannada, Karnataka. The Permanent sample plots were utilized to assess growth patterns across various forest types. Total of nine one-hecta

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8

Yim, Jong-Su, Rae Hyun Kim, Sun Jeoung Lee, and Yeong Mo Son. "Land-use Change Assessment by Permanent Sample Plots in National Forest Inventory." Journal of Climate Change Research 6, no. 1 (2015): 33. http://dx.doi.org/10.15531/ksccr.2015.6.1.33.

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9

Chagneau, P., F. Mortier, and N. Picard. "Designing permanent sample plots by using a spatially hierarchical matrix population model." Journal of the Royal Statistical Society: Series C (Applied Statistics) 58, no. 3 (2009): 345–67. http://dx.doi.org/10.1111/j.1467-9876.2008.00657.x.

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10

Puri, L., H. Meilby, S. Rayamajhi, et al. "Growth and volume based on permanent sample plots in forests managed by communities." Banko Janakari 22, no. 2 (2013): 11–18. http://dx.doi.org/10.3126/banko.v22i2.9194.

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In order to monitor the woody biomass yield 241 permanent sample plots wereestablished in four forests (total 2017 ha) across three physiographic regionsof Nepal. Tree species identification, tree positioning and diameter at breastheight (DBH) for all trees and height for a sample of trees were measured in2005 and 2010. Results presented are density and volume by forest, speciesand diameter class in 2010 and the species-wise increment between 2005and 2010 by forest. Standing volumes were between 134 and 311 m3ha-1, andannual volume increment was 2.5-7.6 m3ha-1. These plots may be utilized forf

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Whitmore, T. C. "Guidelines to Avoid Remeasurement Problems in Permanent Sample Plots in Tropical Rain Forests." Biotropica 21, no. 3 (1989): 282. http://dx.doi.org/10.2307/2388658.

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12

Dubenok, N. N., A. V. Lebedev, and S. A. Chistyakov. "Age changes of birch stands on the permanent sample plots of the Kologrivsky Forest Nature Reserve." Timiryazev Biological Journal, no. 1 (June 13, 2024): 6–21. http://dx.doi.org/10.26897/2949-4710-2024-2-1-6-21.

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The actual patterns of forest stand dynamics can be revealed only if observational data on permanent sample plots are available. The aim of the study is to identify the characteristics of the age changes of stand indicators in permanent birch sampleplots of the Kologrivsky Forest Nature Reserve (Kostroma Region). The object of the study was forest stands in birch stands located in the core of the Kologrivsky Forest Nature Reserve. At present they are represented by mature and over-mature birch stands with the predominance of spruce undergrowth in narrow clearings of 1928 with a width of 100‑15

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13

Nielsen, Cathy, Olesia Van Dyke, and John Pedlar. "Effects of past management on ice storm damage in hardwood stands in eastern Ontario." Forestry Chronicle 79, no. 1 (2003): 70–74. http://dx.doi.org/10.5558/tfc79070-1.

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The 1998 ice storm caused damage to forests across much of eastern North America. One of the information needs expressed by landowners and the broader forest community in eastern Ontario was an assessment of the effect of past management on degree of damage in hardwood stands. Ice storm damage was assessed in managed and unmanaged permanent sample plots established prior to the ice storm. In addition, 1587 temporary sample plots established after the 1998 ice storm were used to examine the effect of basal area, stand composition, stand location and tree size on degree of ice damage. Permanent

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14

Kiviste, Andres, Maris Hordo, Ahto Kangur, et al. "Monitoring and modeling of forest ecosystems: the Estonian Network of Forest Research Plots / Metsaökosüsteemide seire ja modelleerimine metsa kasvukäigu püsiproovitükkide võrgustiku abil." Forestry Studies 62, no. 1 (2015): 26–38. http://dx.doi.org/10.1515/fsmu-2015-0003.

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Abstract Forest research has long traditions in Estonia that can be traced back to the 19th century. Data from long-term forest experiments are available since 1921. The first studies mainly focused on silvicultural treatments and application of such data for understanding and modeling ecological processes was limited. The Department of Forest Management of the Estonian University of Life Sciences started to develop the Estonian Network of Forest Research Plots (ENFRP) in 1995. Since then, plots have been continuously re-measured with 5-year interval. Approximately 100-150 permanent sample plo

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15

Lang, Mait, Tauri Arumäe, Diana Laarmann, and Andres Kiviste. "Estimation of change in forest height growth." Forestry Studies 67, no. 1 (2017): 5–16. http://dx.doi.org/10.1515/fsmu-2017-0009.

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AbstractForest height increment rate is related to the forest growth conditions. Data bases of previous forest inventories contain information about forest heightage relationship on large number of forest stands while repeated measurements of permanent sample plots provide an excellent reference for comparison. Repeated airborne laser scanning of forest stands is an additional source for the estimation of change in forest structure. In this study, height growth of middle-aged and older forest stands for about 10 year period was compared to an algebraic difference model on permanent sample plot

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16

Winzeler, Klemens. "Weiterentwicklung der Kontrollstichproben am Beispiel des Kantons Glarus | Further development of permanent forest inventory; the example of Canton Glarus." Schweizerische Zeitschrift fur Forstwesen 154, no. 3-4 (2003): 112–16. http://dx.doi.org/10.3188/szf.2003.0112.

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In accordance with the revision of the forest law, a planning concept and new regulations for forestry planning have been drawn up for Canton Glarus. Owing to the size of Canton Glarus forest inventory is established at a cantonal level so that it can be related to other planning issues. The cantonal forest inventory is drawn up on the basis of previous inventories. From 1975 to 1993 a total of 3500 permanent sample plots were set up over three acres. In the follow-up inventory at a cantonal level the goal was to gather and analyse 30 important characteristics (growing stock, increment) of a s

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17

Ter-Mikaelian, Michael T., Stephen J. Colombo, and Jiaxin Chen. "Amount of downed woody debris and its prediction using stand characteristics in boreal and mixedwood forests of Ontario, Canada." Canadian Journal of Forest Research 38, no. 8 (2008): 2189–97. http://dx.doi.org/10.1139/x08-067.

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We analyzed data on downed woody debris (DWD) from 435 permanent sample plots in boreal and mixedwood forests of Ontario seeking empirical relationships to predict DWD quantity from stand attributes. In each permanent sample plot, data were collected along three transects, including diameter, tree species, and degree of decomposition of DWD pieces with diameter greater than or equal to 7.5 cm at the point of intersection with the transect. Amounts of DWD in sample plots ranged from 0.7 to 402.7 m3·ha–1 and from 0.1 to 103.4 t·ha–1. Mean DWD values were 65.4 m3·ha–1 and 15.9 t·ha–1 in softwood-

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18

Jankov, J., and K. Gubka. "Functional efficiency of stand with soil-conservation erosion control function on the forest unit Banská Bystrica – Uľanka." Beskydy 7, no. 1 (2014): 47–58. http://dx.doi.org/10.11118/beskyd201407010047.

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The paper analyses functional efficiency of stand with soil-conservation erosion control function. The object of research was the subcompartment 1160 d on the forest unit Banská Bystrica – Uľanka. In the stand was established the network of six permanent sample plots, where the basic characters of structure were recorded and functional efficiency of trees was estimated. The subject of the research was also an analysis of abundance of natural regeneration. As follows from the research, the stand fulfils the requirement placed on ecosystems with the preferential soil-conservation erosion control

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19

KAJIHARA, Mikihiro, Norihiro KAJIHARA, Koji FUJIMOTO, and Takeshi YAMAMOTO. "Stand volume increment in the permanent sample plots of selection forest at Imasu, Gifu Prefecture." Japanese Journal of Forest Planning 27 (1996): 43–52. http://dx.doi.org/10.20659/jjfp.27.0_43.

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20

Kaitera, Juha, Jarkko Hantula, and Seppo Nevalainen. "Distribution and frequency of Cronartium flaccidum on Melampyrum spp. in permanent sample plots in Finland." Scandinavian Journal of Forest Research 26, no. 5 (2011): 413–20. http://dx.doi.org/10.1080/02827581.2011.579153.

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21

Picard, Nicolas, Steen Magnussen, Ludovic Ngok Banak, Salomon Namkosserena, and Yves Yalibanda. "Permanent sample plots for natural tropical forests: A rationale with special emphasis on Central Africa." Environmental Monitoring and Assessment 164, no. 1-4 (2009): 279–95. http://dx.doi.org/10.1007/s10661-009-0892-y.

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22

Weiguang, Gong, and Peter L. Marshall. "Establishment of permanent sample plots and analysis of stand characteristics for interior Douglas-fir forests." Journal of Forestry Research 8, no. 1 (1997): 23–26. http://dx.doi.org/10.1007/bf02864934.

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23

Hynynen, Jari, and Risto Ojansuu. "Impact of plot size on individual-tree competition measures for growth and yield simulators." Canadian Journal of Forest Research 33, no. 3 (2003): 455–65. http://dx.doi.org/10.1139/x02-173.

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The study addresses the effect of sample plot size on the bias related to measured stand density. We analyzed the effect of plot size on model coefficients and model performance in the simulation. Alternative growth models were developed for Norway spruce (Picea abies (L.) Karst.) on the basis of data obtained from permanent inventory sample plots of varying size. The competition measures were estimated from small plots with an average radius of 6 m, large plots with an average radius of 10 m, a cluster of three small plots within a stand, and a cluster of three large plots within a stand. The

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24

Surina, Elena A., and Nikolay S. Minin. "Efficiency of Thinning in Deciduous-Spruce Forest Stands in the Northern Taiga Forest Region of the European Part of the Russian Federation." Lesnoy Zhurnal (Forestry Journal), no. 5 (November 1, 2023): 103–14. http://dx.doi.org/10.37482/0536-1036-2023-5-103-114.

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Research on permanent sample plots (Arkhangelsk, Northern district forestry, Obozerskoye forestry) in birch and spruce stands with an understory layer of spruce was carried out. The sample plots were established since 1966 and differed in the intensity of thinning. The results were analyzed by correlating them with the data of 6 previously conducted surveys (in 1966, 1974, 1986, 2001, 2010, 2020) for permanent sample plots 1K and 2RU and 5 surveys (1974, 1986, 2001, 2010, 2020) for permanent sample plot 19. In the absence of maintenance in young stands aged 20-30 years (permanent sample plot 1

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Stefanović, Tomislav, Renata Gagić-Serdar, Ilija Đorđević, et al. "Studies of defoliation on ICP sample plots level I in Republic of Serbia." Sustainable Forestry: Collection, no. 75-76 (2017): 41–56. http://dx.doi.org/10.5937/sustfor1775041s.

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Project of forests condition monitoring (ICP Forests) operates as an international European project in which, on grid of ICP sample plots (bioindication points) condition of forests has been monitored annually in continuity, including recording data on defoliation with evidencing any damage to the trees. The main goal of the program is monitoring of condition of forests on a permanent, representative surfaces, arranged in a systematic grid distributed on the territory of of Europe. This paper analyzes the data on defoliation as part of the results of the forest conditions monitoring on ICP sam

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Metsaranta, J. M., and V. J. Lieffers. "Using dendrochronology to obtain annual data for modelling stand development: a supplement to permanent sample plots." Forestry 82, no. 2 (2009): 163–73. http://dx.doi.org/10.1093/forestry/cpn051.

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Spirydovich, A. V., N. B. Vlasava, A. D. Ahabalayeva та ін. "Сomparative analysis of the species abundance and structure of plant communities involving <i>Rhamnus cathartica</i> in Belarus and in the midwestern regions of the USA". Doklady of the National Academy of Sciences of Belarus 67, № 5 (2023): 399–409. http://dx.doi.org/10.29235/1561-8323-2023-67-5-399-409.

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The history of intentional introduction of Rhamnus cathartica L. into the Midwestern regions of the USA is briefly described. The species abundance and structure of plant communities, in which Rhamnus cathartica, a native species for Belarus and invasive in the USA grows, has been studied. We compared the studied parameters (floristic description of the monitoring plots, field enumeration of Rhamnus cathartica individuals, average height, projective coverage of the accompanying herb species) at two permanent sample plots in Belarus and three permanent sample plots in the Midwestern regions of

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Kadetov, Nikita G., Svetlana P. Urbanavichute, Angelina E. Gnedenko, and Ekaterina N. Andryushkevich. "Dynamics of plant species number in postpyrogenic phytocoenoses of the Kerzhensky reserve." Anthropogenic Transformation of Nature 10, no. 2 (2024): 6–12. https://doi.org/10.17072/2410-8553-2024-2-6-12.

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An overview of changes in the herb-shrub layer number of species on permanent sample plots established in the Kerzhensky Reserve after the wildfires of 2010 is provided. It is shown that the nature of the change in this indicator is influenced by both the type of fire and the shape of the mesorelief to which the permanent sample plot is confined. The presence of maxima and minima in the number of species was noted. The similarity in the type of changes in the number of species for areas with crown and intense ground fires is shown.

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Ung, Chun-Huor, and François Bertrand. "Analyse qualitative des équations différentielles d'un modèle de croissance pour l'érablière à sucre." Canadian Journal of Forest Research 17, no. 7 (1987): 588–93. http://dx.doi.org/10.1139/x87-099.

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This paper describes a growth model based on the Weibull function. An estimation of the model parameters is made from data of 89 permanent sample plots provided by the Quebec Department of Energy and Resources. Sugar maple represents more than 75% of the total basal area in each sample plot. Qualitative analyses is used to study completely the mathematical behavior of the model.

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Bernard, Charles-Etienne, Arnaud Delcoigne, Gilles Thébaud, Camille Roux, and Renée Skrzypczak. "Suivi permanent de l’évolution de la flore et des habitats naturels de la région clermontoise (territoire de Clermont Communauté) : état initial / Permanent monitoring of the evolution of flora and natural habitats in the Clermont-Ferrand area : initial status." Revue des sciences naturelles d'Auvergne 77, no. 1 (2013): 43–74. https://doi.org/10.3406/rsna.2013.1098.

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There is a remarkable diversity of natural environment in the Clermont-Ferrand area, thanks to the altitudinal gradient, the geological diversity, the topography etc. Previous studies in this region reported the distribution of priority habitats in the territory, and allowed us to select sites for the implementation of a long term monitoring of flora and vegetation. Nine sites were selected, each with their particularities, on which different methodologies were applied, like permanent sample plots or PhytoSocio-Ecological Toposequence (PSET) We report here the initial status of the monitoring,

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Johansson, Per, and Göran Thor. "Lichen species density and abundance over ten years in permanent plots in inland Dronning Maud Land, Antarctica." Antarctic Science 20, no. 2 (2008): 115–21. http://dx.doi.org/10.1017/s0954102007000855.

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AbstractIn the austral summer of 1991–92, 120 sample plots were established along 11 transects at various distances from the Swedish research stations Wasa and Svea in Dronning Maud Land, Antarctica. These plots were re-examined in 2001–02 to evaluate overall changes and possible local impact from human activities around the research stations on the terrestrial vegetation, formed by lichens and mosses. The results showed high consistencies over the ten years, but nevertheless suggest a slight overall increase in both lichen species density and abundance, measured as the number of lichen record

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García, Oscar. "Comparing and Combining Stem Analysis and Permanent Sample Plot Data in Site Index Models." Forest Science 51, no. 4 (2005): 277–83. http://dx.doi.org/10.1093/forestscience/51.4.277.

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Abstract Most site index models are built either from repeated measurements on permanent sample plots or by using data obtained by stem analysis. Sometimes both types of data are available. It is then of interest to test them for consistent height-age trends, and to estimate model parameters using all the data. Efficient procedures should take into account the difference in error patterns between the two data sources. A stochastic differential equation model is proposed in which trend and error parameters can take either different or common values for various data groups. All parameters are si

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Rupšys, Petras. "Parametrų įvertinimas L1 normos metodu stochastiniame tiesiniame su vėlinimu augimo modelyje." Lietuvos matematikos rinkinys 46 (September 21, 2023): 397–404. http://dx.doi.org/10.15388/lmr.2006.30772.

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This paper considered deterministic and stochastic delayed linear growth laws for the modeling of the process of growth. For the estimation of parameters the L1 distance procedure was proposed. As an illustrative experience was used a real data set from repeated measurements on permanent sample plots of pine stands in Lithuania.

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Kučera, Aleš, Ladislav Holík, Karel Marosz, Antonín Martiník, and Dušan Vavříček. "Changes in forms of available nitrogen and respiration in soil of beech forest as a reaction to a deforestation resulting from wind storm." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 61, no. 1 (2013): 107–13. http://dx.doi.org/10.11118/actaun201361010107.

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The article deals with the reaction of soil environment to a violent deforestation resulting from a wind storm. As a material, permanent inventory plot located in Training Forest Enterprise Masaryk Forest Křtiny was selected. The plot represents beech high forest, where soil was sampled from four types of sample plots: (1) maternal forest representing situation before the storm; (2) zone of transition from the maternal forest to the open area; (3) reafforested clearing; (4) natural evolution. From each sample plot type, 6 mixed samples of Ah horizon were analysed to assess N-ammonium (N-NH4+)

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Дубенок, Н. Н., А. В. Лебедев, and С. А. Чистяков. "Dynamics of Silvicultural and Taxation Indicators of Forest Stands on Permanent Sample Plots in Native Spruce Forests of the Kologrivsky les Nature Reserve." Лесохозяйственная информация, no. 2 (June 14, 2024): 37–46. http://dx.doi.org/10.24419/lhi.2304-3083.2024.2.03.

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Приведены особенности лесоводственно-таксационных показателей древостоев на постоянных пробных площадях в коренных ельниках заповедника «Кологривский лес» (Костромская обл.). Исследования проведены на 5 пробных площадях (0,25–1,0 га), заложенных в 1981–1984 гг. сотрудниками Костромской лесной опытной станции и Московского государственного университета леса в памятнике природы «Кологривский лес». С 2014 по 2019 г. проведены работы по восстановлению этих пробных площадей. По данным наблюдений на пробных площадях проанализирована динамика лесоводственно-таксационных показателей (средние высота и

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Kuberskaya, O. V. "SPATIAL DISTRIBUTION AND REALIZATION OF THE LIFE CYCLE OF THE GROUND BEETLE PTEROSTICHUS ADSTRICTUS ESCHSCHOLTZ, 1823 (COLEOPTERA, CARABIDAE) IN THE KOMSOMOLSKY NATURE RESERVE, KHABAROVSKY KRAI." A.I. Kurentsov's Annual Memorial Meetings 33 (July 12, 2022): 121–28. http://dx.doi.org/10.25221/kurentzov.33.11.

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The spatial distribution of the ground beetle Pterostichus adstrictus Eschscholtz, 1823 in the Komsomolsky Nature Reserve on five forest permanent sample plots in 2017–2019 are examined. It is shown that the species in this protected area implements a one-year monovoltine life cycle with a spring-summer type of reproduction and imaginal diapause in winter.

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Иванов, Sergey Ivanov, Коротков, et al. "To the trends in the forest forming process in northeastern Moscow region." Forestry Engineering Journal 5, no. 3 (2015): 41–53. http://dx.doi.org/10.12737/14152.

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Case studies of 75 permanent sample plots examine the directions of species composition change in different tree formations in case of normal evolution of biocoenoses and mass spruce decline. In case of natural development of forest biocoenoses, only on 5 plots of total 75 species composition of new tree generations is similar to that of the upper tree layer. On other 5 plots, the restoration of conditionally indigenous mixed spruce and lime forests proceeds. In all other cases, the forests develop towards the formation of broad-leaved communities with the predomination of lime. The expansion

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Feshchenko, Roman, Yaroslav Kovbasa, Raisa Matashuk, Svitlana Bilous, Olena Naumovska, and Andrii Bilous. "Current increment of ecosystem services in permanent sample plots within the forest stands of the Feofania park-monument." Ukrainian Journal of Forest and Wood Science 14, no. 4 (2023): 88–102. http://dx.doi.org/10.31548/forest/4.2023.88.

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Despite the fact that forests in nature conservation areas are of mature and over-mature age, they have a leading role in the production of ecosystem services, in particular in ensuring biodiversity. In the typical sense, at the mature and over-mature age of stands, the growth of live biomass and carbon sequestration almost stops, and the death of trees leads to a negative change in the stock. The purpose of the study is to substantiate the ability of over-mature forests to accumulate live biomass under the condition of the formation of multi-tiered and different-age stands. The research was c

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Sharma, Mahadev, John Parton, Murray Woods, et al. "Ontario's forest growth and yield modelling program: Advances resulting from the Forestry Research Partnership." Forestry Chronicle 84, no. 5 (2008): 694–703. http://dx.doi.org/10.5558/tfc84694-5.

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The province of Ontario holds approximately 70.2 million hectares of forests: about 17% of Canada’s and 2% of the world’s forests. Approximately 21 million hectares are managed as commercial forests, with an annual harvest in the early part of the decade approaching 200 000 ha. Yield tables developed by Walter Plonski in the 1950s provide the basis for most wood supply calculations and growth projections in Ontario. However, due to changes in legislation, policy, and the planning process, they no longer fully meet the needs of resource managers. Furthermore, Plonski`s tables are not appropriat

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Hébert, Rémi. "Méthodologie pour l'analyse des données forestières historiques : le cas de la forêt expérimentale du Lac Édouard, Québec." Forestry Chronicle 80, no. 4 (2004): 469–72. http://dx.doi.org/10.5558/tfc80469-4.

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Permanent sampling plots in experimental forests have generated large quantities of data over the past decades. Methods used to collect certain of these data have often varied over the course of the sampling. The objective of this study was to develop a process to evaluate sampling differences in historical forest data. The proposed approach is to: (1) examine available data and seek out the missing ones in archives of the concerned organizations; (2) regroup data by inventory periods; (3) search for the sampling methodology in each of the different inventory periods; and (4) evaluate the impa

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Pokharel, Bharat, Jeffery P. Dech, and Peter Uhlig. "A tool for converting forest ecosystem classifications for permanent or temporary growth plots into the new provincial Ecological Land Classification (ELC) system in the boreal regions of Ontario." Forestry Chronicle 88, no. 1 (2012): 49–59. http://dx.doi.org/10.5558/tfc2012-010.

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Forest Ecosystem Classification (FEC) systems were originally developed and used in the Province of Ontario at regional levels with the objective of classifying forest ecosystems to support silvicultural decision-making in an operational setting. A new provincial Ecological Land Classification (ELC) system has been developed, which integrates the regional systems into a single consistent framework. To make continued use of data and knowledge gained from long-term forest monitoring plots classified under the old FEC system, such as Permanent Growth Plots (PGPs), Permanent Sample Plots (PSPs) an

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Kuswandi, Relawan. "THE EFFECT OF SILVICULTURAL TREATMENT ON STAND GROWTH OF LOGGED-OVER FOREST IN SOUTH PAPUA." Indonesian Journal of Forestry Research 1, no. 2 (2014): 117–26. https://doi.org/10.59465/ijfr.2014.1.2.117-126.

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Forest stand structure could be used as one of the variables in deciding the possibility to harvest forest product. On logged-over forests, data and information over stand structure could become the basis for decision making for harvesting. To measure and analyze yield on logged-over forest, each forest management unit (IUPHHK) is obligated to establish Permanent Sample Plots (PSPs) for monitoring the growth and yield of the managed stand. In some of the plots, maintenances and thinning treatments are applied while other plots are not treated. The results, after several years of observations,

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Parish, Roberta, Joseph A. Antos, Peter K. Ott, and C. Mario Di Lucca. "Snag longevity of Douglas-fir, western hemlock, and western redcedar from permanent sample plots in coastal British Columbia." Forest Ecology and Management 259, no. 3 (2010): 633–40. http://dx.doi.org/10.1016/j.foreco.2009.11.022.

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Palát, Milan. "Modelling of biomass fractions and radial increment of the selected Norway spruce forest stands in the region of the Moravian-Silesian Beskids." Beskydy 8, no. 1 (2015): 9–25. http://dx.doi.org/10.11118/beskyd201508010009.

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Norway spruce (Picea abies /L./ Karst.) appears to be the most important conifer species in our mountain regions. Statistically significant differences were determined in the diameter and height increments for particular types of branching. There were verified regression functions for estimation biomass fractions. Using model calculations, fractions of above-ground and underground biomass were determined for selected permanent sample plots of the Moravian-Silesian Beskids from lower altitudes. Statistically significant differences were determined in the diameter and height increments for parti

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kuswandi, Relawan, and Agustinus Murdjoko. "POPULATION STRUCTURES OF FOUR TREE SPECIES IN LOGGED-OVER TROPICAL FOREST IN SOUTH PAPUA, INDONESIA: AN INTEGRAL PROJECTION MODEL APPROACH." JOURNAL OF FORESTRY RESEARCH 2, no. 2 (2015): 93–101. https://doi.org/10.20886/ijfr.2015.2.2.93-101.

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Selective logging has been taking place in Papua for several decades. In contrast, very little is known about the stand structure in post-logged forest.  Hence, this paper investigates stand structures in logged-over area of tropical forest in South Papua. Four species were selected in three one-hectare permanent sample plots (PSPs): Vatica rassak, Syzygium sp, Litsea timoriana and Canarium asperum.  PSPs were located in the forest concession area of  PT. Tunas Sawaerma in Assiki, Boven Digul, in South Papua.  Data sets comprised measurements made in 2005 and 2012 consistin

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Dubenok, N. N., and A. V. Lebedev. "Dynamics of stand indicators of pine plantations according to the data of long-term observations." Rossiiskaia selskokhoziaistvennaia nauka, no. 4 (August 15, 2023): 48–51. http://dx.doi.org/10.31857/s2500262723040099.

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The purpose of the study is to study the dynamics of stand indicators (average height and diameter, the basal areas and stock) of pine forest plantations of different initial density over a 120-year period based on long-term observations on permanent sample plots. The object of the study was pine plantations on permanent trial plots of the Forest Experimental Station (Moscow). Course of Growth tables are among the simplest models that reflect the change in stand indicators of a collection of forest stands. A comparison of the growth and yield of forest stands on permanent test plots was carrie

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Nord-Larsen, Thomas. "Developing Dynamic Site Index Curves for European Beech (Fagus sylvatica L.) in Denmark." Forest Science 52, no. 2 (2006): 173–81. http://dx.doi.org/10.1093/forestscience/52.2.173.

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Abstract In base-age specific methodologies, assessment of base age and site index may be a problem when developing site curves from repeated measurements on permanent sample plot data. In most cases, such data will not contain measurements at any base age that is common for all the sample plots, and some sort of interpolation or even extrapolation would have to be applied to address this issue. Base-age invariant methodologies pose the desirable property of estimating the curves without prior arbitrary assumptions about values of the site indices. Presented here is the development of such bas

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Kalliokoski, Tuomo, Harri Mäkinen, Tapio Linkosalo, and Annikki Mäkelä. "Evaluation of stand-level hybrid PipeQual model with permanent sample plot data of Norway spruce." Canadian Journal of Forest Research 47, no. 2 (2017): 234–45. http://dx.doi.org/10.1139/cjfr-2016-0236.

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The evaluation of process-based models (PBM) includes ascertaining their ability to produce results consistent with forest growth in the past. In this study, we parameterized and evaluated the hybrid model PipeQual with datasets containing traditional mensuration variables collected from permanent sample plots (PSP) of even-aged Norway spruce (Picea abies (L.) Karst.) stands in Finland. To initialize the model in the middle of stand development and reproduce observed changes in Norway spruce crown structure, the built-in empirical relationships of crown characteristics were made explicitly dep

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Kuzmichev, V. V. "LIMIT LINE “AVERAGE DIAMETER - AVERAGE DISTANCE BETWEEN TREES” IN STANDS." Prirodoobustrojstvo, no. 5 (2024): 119–26. https://doi.org/10.26897/1997-6011-2024-5-119-126.

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The degree of space occupancy with woody plants has a certain limit associated with their biological characteristics and the level of soil fertility. The value of relative density in our country serves as a criterion for determining the intensity of thinning, while abroad the “index of forest density is used”. The purpose of the study is to substantiate the limit line “average diameter – average distance between trees” in stands of the main forest-forming species according to the data of long-term observations on permanent sample plots. The materials for the study were measurement data on perm

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SHEIL, DOUGLAS, STEPHEN JENNINGS, and PETER SAVILL. "Long-term permanent plot observations of vegetation dynamics in Budongo, a Ugandan rain forest." Journal of Tropical Ecology 16, no. 6 (2000): 865–82. http://dx.doi.org/10.1017/s0266467400001723.

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Species composition and turnover that have occurred in a series of permanent sample plots established during the 1930s and 1940s in Budongo, a semi-deciduous Ugandan forest, are reported. The plots were established as part of a sequence first used to describe forest succession, five of which have been maintained and which were last measured in 1992-1993. One plot (plot 7) provides 53 y of data from old-growth pristine forest. Plot 15 was established in wooded grassland at the forest edge and is now closed high forest. Evaluation of the remaining three plots is complicated by silvicultural inte

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