祁连山大野口流域青海云杉种群空间格局及其关联性

[an error occurred while processing this directive]

拓锋¹^,², 刘贤德¹^,²^,^*(

), 刘润红³, 赵维俊², 敬文茂², 马剑², 武秀荣², 赵晶忠², 马雪娥²

Spatial distribution patterns and association of Picea crassifolia population in Dayekou Basin of Qilian Mountains, northwestern China

TA Feng¹^,², LIU Xian-De¹^,²^,^*(

), LIU Run-Hong³, ZHAO Wei-Jun², JING Wen-Mao², MA Jian², WU Xiu-Rong², ZHAO Jing-Zhong², MA Xue-E²

图4. 祁连山大野口流域10.2 hm²森林动态监测样地内青海云杉种群不同径级个体间的空间关联性。A, 幼树与小树。B, 幼树与中树。C, 幼树与大树。D, 小树与中树。E, 小树与大树。F, 中树与大树。r, 以目标树为圆点的取样圆半径; ?g^obs(r), 双变量成对相关函数g₁₂(r)的函数值; g^theo(r), g₁₂(r)函数的期望值; 灰色阴影部分为99%的置信区间; 1-4表示4个径级。

Fig. 4. Spatial association of Picea crassifolia individuals with different diameter at breast height in the forest dynamics plot in Dayekou Basin of Qilian Mountains, northwestern China. A, Saplings and small trees. B, Saplings and medium trees. C, Saplings and big trees. D, Small trees and medium trees. E, Small trees and big trees. F, Medium trees and big trees. r, the radius of the sampling circle with the target tree as the dot; ?g^obs(r), the function value of the bivariate pair-correlation function (g₁₂(r)); g^theo(r), the theoretical value of the g₁₂(r) function; the gray shaded part is the 99% confidence interval; 1-4 indicate four different diameter classes.