Binary Standing Volume Model for Pinus amandii in Yunnan Province
Ten binary standing timber volume candidate models for Pinus amandii were selected,and the modeling data was input into the candidate models to calculate the estimated parameters of the candidate models.Based on parameter estimation values,the DBH and tree height in the modeling samples were re-spectively substituted into 10 candidate models to calculate the binary theoretical volume of the single plant.The binary theoretical volume of single plant was fitted and analyzed with the measured volume to obtain six evaluation indicators,including sum of squares for regression(SSR),correlation coefficient(R2),total relative error(RS),mean relative error(REA),absolute mean relative error(REAA),and estimation accuracy.The comparative analysis of evaluation indicators showed that the model V=c0Dc1Hc2 had significantly better indicators than other models.Residual tests and F-tests were conducted on the model,and all indicators met the relevant technical standards.Based on comprehensive analysis,the model V=0.0000710744×D1.852583×H0.975667 could be selected as the binary timber volume table compil-ation and forest volume investigation model for Pinus amandii plantation;the model V=0.0000891114×D1.838706×H0.891723 could be selected as the binary standing timber volume table compilation and forest volume investigation model for Pinus amandii natural forests.
Pinus amandiibinary standing timber volume modelapplicability testingcompilation of forestry data tableYunnan Province
NETL
NSTL
万方数据
