林分物种多样性指标体系的研究

为了全面评价林分物种多样性状况,利用层次分析法,构建了包含乔木、灌木、草本和地被植物的物种多样性指标体系.该指标体系按指标性质分为物种多样性综合指数和濒危植物综合指数.多样性综合指数中用修正后的Mo指数作物种丰富度指标,用Shannon-Wiener指数计算乔木蓄积、直径分布、灌草盖度和高度等作多样性指标,同时考虑了更新幼苗和枯木等多样性因子.在濒危植物综合指数中,引入了稀见种的概念,以增强对多样性的预测.在多样性指标体系的应用上,采取两个综合指数同时控制的办法.

Synthetic indices for stand species diversity.

This paper sets up an index system for species diversity, which including tree layer, shrub layer, grass layer and ground layer, using the method of Analytic Hierarchy Process (AHP). This index system includes stand species diversity synthetic index (SSDSI) and stand endangered plant synthetic index (SEPSI) according to the characters of indicators. SSDSI selects Mo index as species richness index, selects Shannon Wiener as species diversity index. SSDSI reflects the diversity factors such as volume, stand diameter distribution, coverage and height of shrub and grass, floristic composition, young plant and dead plant etc. SEPSI puts forward a formula estimating endangered situation, which can be used to forecast the change of species diversity. Finally this paper suggests that both SSDSI and SEPSI should be considered at the same time when they are applied to judge the stand species diversity.