桂西北喀斯特地区水土流失敏感性评价

长江流域资源与环境 >> 2009, Vol. 18 >> Issue (6): 579-.

桂西北喀斯特地区水土流失敏感性评价

罗 |俊^1|2|3,王克林^1,2|陈洪松^1|2|张 |伟^1|2

（1.中国科学院亚热带农业生态研究所|湖南长沙 410125；2.中国科学院环江喀斯特农业生态试验站|广西环江 547100；3.中国科学院研究生院|北京 100049）

出版日期:2009-06-20

SENSITIVITY OF WATER AND SOIL LOSS OF NORTHWEST KARST AREA IN GUANGXI PROVINCE

LUO Jun^1,2,3|WANG Kelin^1,2|CHEN Hongsong^1,2,ZHANG Wei1,2

(1.Institute of Subtropical Agriculture〖QS〗|Chinese Academy of Sciences〖QS〗|Changsha |410125〖QS〗|China〖QS〗；2.Huanjiang Experimental Station of Karst Ecosystem〖QS〗|Chinese Academy of Sciences〖QS〗|Huanjiang 547100〖QS〗|China〖QS〗；3.Graduate University of Chinese Academy of Sciences〖QS〗|Beijing 100049〖QS〗|China)

Online:2009-06-20

摘要/Abstract

摘要：

由于碳酸盐岩的可溶蚀性、所形成土壤的不稳定性及碳酸盐岩植被的脆弱性等特征，在碳酸盐岩区水土流失的风险较非碳酸盐岩区更大，水土流失敏感性受岩性的影响比非碳酸盐岩地区更明显。作为生态功能区划的基础性工作，针对桂西北喀斯特地区生态环境特征，以河池市为例，分别建立了碳酸盐岩区域和非碳酸盐岩区域水土流失敏感性评价指标体系。以碳酸盐岩区岩性的差异为主导指标，在GIS技术支持下，对研究区水土流失敏感性进行评价，并分析其空间分布格局。结果显示：桂西北河池市水土流失敏感区面积比例在99%以上，其中碳酸盐岩区域水土流失敏感性明显高于非碳酸盐岩区域；从全市来看，水土流失敏感程度较高，其中高度敏感和极度敏感面积比例分别达到了31%和237%；水土流失重要敏感区主要分布于河池市南部的都安大化和中北部岩溶山原区，这些地区应加强生态环境防护措施。

关键词: 喀斯特/水土流失敏感性/空间分布/桂西北

Abstract:

Because of the solubility of carbonate rock,the instability of karst soil and the vulnerability of karst vegetations,the risk of water and soil loss is bigger in carbonate rock areas than in noncarbonate rock areas.The effects of lithology to sensitivity of water and soil loss are stronger in carbonate rock areas than noncarbonate rock areas.This paper is the basic study of ecological function division.To these facts and the ecological characters of karst area,considering the difference of lithology as the dominant factor,the accountable factors were identified as the assessment indices respectively in carbonate rock areas and noncarbonate rock areas,and the possibly sensitivity degree and distribution law of water and soil loss were analyzed based GIS technology.The results showed that the sensitivity assessment of water and soil loss sensitivity in northwest of Guangxi could reflect the fact on the whole.The areas percentage of water and soil loss sensitivity was above 99%,and there is a visible higher sensitivity degree in karst areas than in nonkarst areas.To the whole region,the integrated sensitivity degree of water and soil loss was higher,and the area percentage of intense and extreme reached 31% and 237%,respectively.These area mainly distributed in Duan and Dahua in the south of Hechi region and karst mountain area in the middle and north of Hechi region.To different sensitivity degree,water and soil loss types and distribution characteristics,this paper put forward relevant measures of developmentmanagement,in order to provide references of ecosystem restoration and sustaining development in the karst regions.

Key words: karst/water and soil loss sensitivity/spatial distribution/northwest of Guangxi

罗, 俊| 王克林, 陈洪松, 张, 伟. 桂西北喀斯特地区水土流失敏感性评价[J]. 长江流域资源与环境, 2009, 18(6): 579-.

LUO| DUN | Wang-Ke-Lin, CHEN Hong-Song, ZHANG| WEI . SENSITIVITY OF WATER AND SOIL LOSS OF NORTHWEST KARST AREA IN GUANGXI PROVINCE[J]. RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN, 2009, 18(6): 579-.

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