Study on DBH-tree Height Growth Model of Poplar Plantations in Tianmen,Qianjiang and Xiantao
Poplar plantations in Tianmen,Qianjiang and Xiantao was taken as the research object,and data from 48 sam-ple plots in 2022 were collected,measuring the growth of 731 poplar trees as modeling data.Nine commonly used DBH-tree height models were fitted using the R software.The best model was determined based on six evaluation indicators:co-efficient of determination(R2),root mean square error(RMSE),sum of squared residuals(SSE),mean absolute error(MAE),mean relative error(MRE),and Akaike information criterion(AIC).The predictive ability of the best model was tested using DBH and tree height data from 10 fixed plots in Poplar plantations in Tianqianmian area in 2021,which had similar site conditions and initial stocking density.The results showed that among 1 to 9 models,the 4th model(quadratic polynomial)provides the best fitting result.The expression of this model was H=1.041 0D-0.012 2D2.It can serve as the fundamental model for diameter-height relationship in poplar plantations in Tianmen,Qianjiang and Xiantao.
PoplarDBHtree heightgrowth modelTianmen,Qianjiang and Xiantao
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