上海农业学报2016，Vol.32Issue(6)：138-142,5.DOI:10.15955/j.issn1000-3924.2016.06.25
刺槐立木地上生物量方程模型研建
Research and establishment of the aboveground biomass model of Robinia pseudoacacia L
摘要
Abstract
Taking 288 strains of 4 years old Robinia pseudoacacia L.planted in East Mountain in Pingquan County of Hebei Province as materials,with the growth factors such as tree height,ground diameter,crown diameter and the product of ground diameter’s square and tree height as independent variable,aboveground biomass (without leaves)dried by natural air as dependent variable,the data were regression analyzed statistically by SPSS 1 7.0 software and the biomass estimation model was established.The 20 estimation models of primarily selection were tested the model fitting effect by R2 and SEE values,and 4 estimation models were optimized.The 4 estimation models are verified by the total relative error (RS),the average relative error (EE),the average absolute value of relative error (RMA)and the prediction accuracy (P),and finally the optimal estimation model was determined.The results showed that the 4 optimized estimation models were linear equations y=4.746x-8. 278,power function y =0.451 x2.309,logarithmic function y =1 4.867ln (x)-1 0.21 0,whose independent variable was crown diameter,and compound function y=1 .426 ×1 .252x whose independent variables was ground diameter.The above-ground (without leaves)biomass of Robinia pseudoacacia L.could be predicted with the 4 models by RS,EE,RMA,P prediction accuracy verification.The power function y =0.451 x2.309 whose independent variable was crown diameter was more accurate with higher prediction accuracy,and linear equation y=4.746x-8.278 secondly.Correlation and regression analysis showed that there were significantly positive correlation among the growth factor of tree height,ground diameter,crown diameter.The correlation coefficient between the ground diameter and crown diameter was up to 0.905,the correlation coefficient between crown diameter and tree height is 0.695,which is the lowest.The linear equation y =0.282x +1 .296 was high reliability,and could predict the crown diameter,whose independent variable was diameter,dependent variable was crown diameter,because the R2 value of the linear equation was bigger than 0.8,the SEE value was also very small.关键词
刺槐/树高/地径/冠幅/地上生物量/回归模型Key words
Robinia pseudoacacia L./Tree height/Ground diameter/Crown diameter/Aboveground biomass/Regression model分类
农业科技引用本文复制引用
周玲,朱镝,李忠喜,吕学华,翟晓巧..刺槐立木地上生物量方程模型研建[J].上海农业学报,2016,32(6):138-142,5.基金项目
“十二五”农村领域国家科技计划课题 （）
