桂西北喀斯特地区脆弱生态环境空间差异性分析

Analysis of Spatial Differences of Fragile Karst Eco-environment in Northwest of Guangxi Province

我国西南喀斯特地区是世界著名的脆弱生态区,受地质地貌、气候、水文等生态因子和人类不合理开发利用等人为因素的影响,生态系统稳定性差,各种生态问题突出,区域差异尤为明显,制约着区域的协调持续发展。本文以桂西北河池地区为研究对象,从分析研究区的脆弱生态特征和主要生态因子入手,运用统计软件SPSS11.5对相关因子进行关联度分析来确定指标和权重,以算得的生态环境脆弱度为基础,把河池地区划分为轻度脆弱类型、中度脆弱类型区、强度脆弱类型和极强度脆弱类型四种生态类型,针对各生态脆弱类型的特征进行空间差异性分析,并提出相应的开发治理措施。

The Karst Region of Southwest China is the famous fragile ecosystem in the world. Be affected by the special geology and topographic features,weather conditions and fluvial erosion,the Karst ecosystems are gradually forfeiting its stability,and the spatial differemce of regions is obviously. For a long time,human activities also have exerted adverse effect on the sustainability of regional development. As a study case,Hechi city locates in the Northwest of Guangxi in China. This paper firstly analyzes the main factors of the ecological environment and system. The technique of ＂grey incidence degree＂and the software SPSSll.5 are used to analyze determines the target and the weight.Then we get fragility degrees of the karst ecological environment for each unit at county（city）level. The analysis shows that the whole province consists of 4 major types of the karst ecological environment fragility in this region,i.e. intensen fragility,medium fragility,slight fragility and latend fragility.Then the paper analyzes the differences of every space based on the characters of each fragiliy type. At last,the author puts forward a series of directions and measures of development-management.