中文摘要：

生态系统的脆弱性评价对于生态系统管理具有莆要作用。存分析岩溶生态系统脆弱性特征和影响因素的基础上，构建了针对岩溶自然系统的脆弱性评价指标体系，涵盖了岩溶生态系统的结构脆弱性、生态过程脆弱性、生态功能脆弱性和人为胁迫脆弱性4个方面，评价指标分别是结构稳定性、多样性生境、能量利用和积累、直接使用价值、石漠化程度和速率等。以不同类型的原生岩溶生态系统的生态基准值作为比较基础，评价系统将现有的退化岩溶生态系统的脆弱性划分为轻微脆弱、中度脆弱、重度脆弱以及系统崩溃4级。

英文摘要：

Assessment on the frangibility of ecosystem plays an important role in ecosystem management. In this paper the characteristics and influence factors of karst ecosystem are analyzed, an index system for evaluating the frangibility of natural karst ecosystems is constructed, which covers structure, processes, function and man - made menace. The indexes include structure stability, diversity of microhabitat type, energy utility and accumulation, direct use value, the degree and speed of karst rocky desertification, etc. In the assessment system the frangibility of degraded karst ecosystems is classified into four levels： slight, medium, severe and ecosystem collapse, as compared with the primitive karst ecosystem.