Development of TRIPLEX-Management model for simulating the response of forest growth to pre-commercial thinning |
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Authors: | Weifeng WangChanghui Peng SY ZhangXiaolu Zhou Guy R LarocqueDaniel D Kneeshaw Xiangdong Lei |
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Institution: | a Institut des Sciences de l’Environnement, Département des Sciences Bioloqiues, Université du Québec à Montréal (UQAM), Montréal, QC H3C 3P8, Canada b FPInnovations, Forintek Division, 2665 East Mall, Vancouver, BC V6T 1W5, Canada c Natural Resources Canada, Canadian Forest Service, Laurentian Forestry Centre, PO Box 3800, 1055 du P.E.P.S., Stn. Sainte-Foy, Quebec, QC G1V 4C7, Canada d Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China |
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Abstract: | In order to simulate forest growth response to pre-commercial thinning (PCT), TRIPLEX1.0 - a process-based model designed to predict forest growth as well as carbon (C) and nitrogen (N) dynamics - was modified and improved to also simulate managed forest ecosystem thinning practices. A three-parameter Weibull distribution model was integrated to simulate thinning treatments within the newly developed TRIPLEX-Management model. The thinning intensity component within the model allows users to simulate thinning treatments by applying basal area, stand density and volume to quantify thinning intensity. Natural mortality decreased following thinning due to an increase in growing space for residual stems. Predicted litterfall pools also increased after thinning events took place. The TRIPLEX-Management model was tested against published observational data for Jack Pine (Pinus banksiana Lamb.) stands subjected to PCT in Northwestern Ontario, Canada. The coefficients of determination (R2) between the predicted and observed variables including stand density, mean DBH (diameter at breast height), the quadratic mean DBH, total volume and merchantable volume as well as belowground, aboveground, and total biomass ranged from 0.50 to 0.88 (n = 20, P < 0.001) with the exception of mean tree height (R2 = 0.25, n = 20, P < 0.05). Overall, the Willmott index of agreement between predicted and observed variables ranged from 0.97 to 1.00. Results show that the TRIPLEX-Management model is generally capable of simulating growth response to PCT for Jack Pine stands. |
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Keywords: | Biomass Diameter distribution Forest management Timber yield Weibull distribution |
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