基于根系发育分级的砂壤土下成熟林木根系构型分析

祝维,余立璇,赵德海,贾黎明

Architectural analysis of root systems of mature trees in sandy loam soils using the root development classification

ZHU Wei,YU Li-Xuan,ZHAO De-Hai,JIA Li-Ming

表4 毛白杨与刺槐根系基径、长度、数量与根系等级的拟合结果

Table 4 Results of fitting regression models of Populus tomentosa and Robinia pseudoacacia—regressing root diameter, length, and numbers (y) on root orders (x), respectively

根形态指标 Root morphological characteristics 根系系统 Root system 方程 Regression model 拟合优度 R2 样本量 n 基径 Basal diameter 纯林毛白杨 P. tomentosa in pure forest y = 0.86381 + 99.24471exp(-2.32112x) 0.484 0 940 混交林毛白杨 P. tomentosa in mixed forest y = 0.70036 + 157.41951exp(-2.77342x) 0.414 9 1 527 混交林刺槐 R. pseudoacacia in mixed forest y = 0.80671 + 91.76619exp(-2.63586x) 0.374 7 541 长度 Length 纯林毛白杨 P. tomentosa in pure forest y = 67.63168 + 1098.3759exp(-3.32236x) 0.014 6 940 混交林毛白杨 P. tomentosa in mixed forest y = 39.71891 + 1313.84526exp(-1.98679x) 0.117 2 1 527 混交林刺槐 R. pseudoacacia in mixed forest y = 92.10741 + 477664.65953exp(-8.10278x) 0.079 5 541 数量 Numbers 纯林毛白杨 P. tomentosa in pure forest y = 5.97738 + 396.37817exp(-0.5((x-2.93757)/0.90608)2) 0.989 5 7 混交林毛白杨 P. tomentosa in mixed forest y = 22.41349 + 474.80796exp(-0.5((x-3.28655)/1.13184)2) 0.912 7 8 混交林刺槐 R. pseudoacacia in mixed forest y = 5.83356 + 196.21954exp(-0.5((x-2.79311)/1.01443)2) 0.936 7 8