新疆野杏天然更新幼株的个体特征及空间分布格局

石荡, 郭传超, 蒋南林, 唐莹莹, 郑凤, 王瑾, 廖康, 刘立强

Characteristics and spatial distribution pattern of natural regeneration young plants of Prunus armeniaca in Xinjiang, China

SHI Dang, GUO Chuan-Chao, JIANG Nan-Lin, TANG Ying-Ying, ZHENG Feng, WANG Jin, LIAO Kang, LIU Li-Qiang

表3 新疆野杏种群各指标计算公式

Table 3 Calculation formula for each index of Prunus armeniaca populations in Xinjiang

$\bar{X}$ ${{S}^{2}}$ C I m* PAI Ca K Iδ $\frac{\mathop{\sum }_{i}^{N}{{x}_{i}}}{N}$ $\frac{\mathop{\sum }_{i}^{N}{{({{x}_{i}}-\bar{X})}^{2}}}{N1}$ $\frac{{{S}^{2}}}{{\bar{X}}}$ $\frac{\sum_{i}^{N}{{X}^{2}}-{\sum }_{i}^{N}X}{{{({\sum }_{i}^{N}\bar{X})}^{2}}-{\sum }_{i}^{N}\bar{X}}$ $\bar{X}+(\frac{{{S}^{2}}}{{\bar{X}}}-1)$ $\frac{{{m}^{*}}}{{\bar{X}}}~$ $\frac{{{S}^{2}}-\bar{X}}{{{{\bar{X}}}^{2}}}$ $\frac{{{{\bar{X}}}^{2}}}{({{S}^{2}}-\bar{X})}$ $\frac{n(\mathop{\sum }_{i}^{n}fx_{i}^{2}-N)}{N(N-1)}$