缙云山针阔混交林更新层物种多样性林隙梯度变化初探

根据对缙云山针阔混交林群落更新层的样带调查数据，采用Margalef物种丰富度指数（R）、Simpson多样性指数（D）、Shannon-Wiener指数（H）、Pielou均匀度指数（J）及Alatolo均匀度指数（E）来研究更新层物种多样性的林隙梯度变化。结果表明：从非林隙到林隙中心，更新层物种多样性逐渐升高，即非林隙＜林隙边缘＜林隙近中心＜林隙中心；物种丰富度变化与其一致，而均匀度变化则表现为两端高中间低的现象；更新层物种多样性林隙梯度变化程度受林隙发育阶段的影响较大，随着林隙的发育，变化程度为早期林隙＞中期林隙＞晚期林隙。

Preliminary research on species diversity change of the regeneration layer in gap gradient in a coniferous-broadleaved forest in Jinyun Mountain

To research the species diversity change of the regeneration layer in gap gradients, we computed the Margalef index, Simpson diversity index, Shannon-Wiener index, Pielou evenness index and Alatolo index with the data from transects through the regeneration layer in a coniferous-broadleaved forest in Jinyun Mountain. Species diversity of the regeneration layer gradually increased from non-gap to the gap central area, such that: Non-gap Middle phase gap > Late phase gap.