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FOREST RESOURCES WANAGEMENT ›› 2021›› Issue (2): 124-130.doi: 10.13466/j.cnki.lyzygl.2021.02.017

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Research on Developing Stand Volume,Biomass and Carbon Stock Models for Major Forest Types in Beijing

YANG Xueyun(), ZENG Weisheng(), CHEN Xinyun   

  1. Academy of Inventory and Planning,National Forestry and Grassland Administration,Beijing 100714,China
  • Received:2021-01-06 Revised:2021-03-08 Online:2021-04-28 Published:2021-06-03
  • Contact: ZENG Weisheng E-mail:yxy0892@126.com;zengweisheng0928@126.com

Abstract:

Stand-level volume,biomass and carbon stock models are quantitative tools for implementing forest resource management.Based on data of 1 425 permanent plots from forest inventory in 2016 in Beijing,and through approaches including independent nonlinear regression (INR),simultaneous error-in-variable equations (SEIVE),and SEIVE with dummy variable modeling,this study works out the stand-level volume,biomass and carbon stock models for ten major forest types,including Chinese pine (Pinus tabuliformis),cypress (Platycladus orientalis),oak (Quercus spp.),birch (Betula spp.),elm (Ulmus spp.),locust (Robinia pseudoacacia),poplar (Populus spp.),other hardwood broadleaved,other softwood broadleaved,and economic arboreal forest.The results show that the coefficients of determination (R2)of the stand-level volume,biomass and carbon stock models for 10 forest types are more than 0.93,the total relative errors (TREs)and average systematic errors (ASEs)are within ±3% and most of them are close to zero.The mean prediction errors (MPEs)are less than 5%,and the mean percent standard errors (MPSEs)are almost less than 15%.The following conclusions can be achieved that the volume stock per hectare of different forest types mainly depend upon basal area and average tree height of the forest stands,and the biomass stock mainly relate to volume stock and average tree height.The SEIVE with dummy variable modeling approach is a feasible method for developing stand-level stock models.The developed volume,biomass and carbon stock models for 10 forest types in Beijing in this study meet the need of precision requirements to the relevant regulation and can be applied on trial in practice.For improving the accuracy of the developed models,volume and biomass data of plot samples calculated by two-variable models need be used to further modify the models.

Key words: volume, biomass, carbon stock, dummy variable model, simultaneous error-in-variable equations

CLC Number: