祁连山大野口流域青海云杉种群空间格局及其关联性

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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3. 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格局。A, 径级I (幼树)。B, 径级II (小树)。C, 径级III (中树)。D, 径级IV (大树)。r, 以目标树为圆点的取样圆半径; ?g_obs(r), 单变量成对相关函数g(r)的函数值; g_theo(r), g(r)函数的期望值; 灰色阴影部分为99%的置信区间。

Fig. 3. Spatial distribution pattern of Picea crassifolia individuals with different diameter at breast height (DBH) in the forest dynamics plot in Dayekou Basin of Qilian Mountains, northwestern China. A, DBH class I (saplings). B, DBH class II (small trees). C, DBH class III (medium trees). D, DBH class IV (big trees). r, the radius of the sampling circle with the target tree as the centroid; ?g_obs(r), the function value of the pair-correlation function (g(r)); g_theo(r), the expected value of the g(r) function; the gray shaded part is the 99% confidence interval.