广西灌江流域岩溶生态环境敏感性分析

灌江流域作为一个典型的岩溶环境单元,具有地表崎岖破碎、植被生长困难、生态系统脆弱、环境承载量低、环境变化敏感的特点。本文根据地表水系将流域划分为22个子流域,并利用层次分析法对生态环境敏感度进行分析评价,目的是为有关政府部门提供宏观依据,以便合理而有效地进行流域开发与环境整治。从整体上看,流域的生态环境为一般敏感,但在流域的不同区段,生态环境的敏感度仍存在着较大差异。白宝以南,两河以北地区的生态环境最为敏感,枧塘、文市、水车和新圩等地区次之,西山、洞井以北等地生态环境的敏感程度相对较低。 

ANALYSIS ON SENSITIVITY OF KARST ENVIRONMENT IN GUANJIANG BASIN, GUANGXI

As a typical karst environmental unit,Guanjiang basin possesses such characteristics as low carrying capacity,bumpy surface,and difficulty in plants growth,vulnerable ecology systems and sensitive to environmental changes.The basin is divided into 22 sub-basins according to the surface water systems and then the environmental sensitivity of each sub-basin is evaluated with AHP(Analytic Hierarchy Process),which aims to provide macroscopic foundation for government to carry out basin development and environmental renovation reasonably and effectively.On the whole,the sensitivity of environment in the basin keeps an ordinary level,however great differences of which exist in each part of the basin. The region from the south of Baibao and that from the north of Lianghe present most sensitive environment,while Jiantang,Wenshi,Shuiche and Xinxu take second place and Xishan,north from Dongjing remains relatively lower.