长江科学院院报 ›› 2009, Vol. 26 ›› Issue (2): 18-22.

• 水土保持与生态建设 • 上一篇    下一篇

基于GIS和BP神经网络模型的长江中上游地区石漠化危险性评价

丁文峰   

  • 出版日期:2009-02-01 发布日期:2012-07-02

Risk Assessment of Rocky Desertification in Upstream and Middle stream of Yangtze River Based on GIS and BP Neural Networks Model

 DING  Wen-Feng-   

  • Online:2009-02-01 Published:2012-07-02

摘要: 通过构建的长江中上游地区石漠化危险性评价指标体系及模型,对长江中上游地区50个市(县)的石漠化危险性进行了评价,利用GIS中的空间插值法对长江中上游地区的石漠化危险程度进行了分区。结果表明:长江中上游地区的石漠化危险程度呈现出从西部向东部逐渐减轻的大致趋势。其中,重度石漠化危险区大致分布于贵州西南部及云南东部一带,甘肃东南部嘉陵江上游地区及重庆的部分地区也有少量分布。石漠化危险程度属于中度的区域大致分布于西南地区的四川东南部、四川东部、重庆西部、贵州大部以及嘉陵江中上游部分地区。轻度石漠化危险区域主要分布于四川盆地及其周围山地丘陵区、陕西南部部分地区、重庆东部以及湖北、湖南的西部地区。无石漠化危险地区主要分布于湖北北部、东部、湖南东部及江西大部分地区。研究结果为长江中上游地区今后大规模开展石漠化防治工作提供了理论依据。

Abstract: On the basis of the model and rocky desertification risk assessment index system,the rocky desertification risks of 50 counties in upstream and middle stream of Yangtze River were assessed. With the aid of the space analysis module of Arcview software, the rocky desertification risk ranking spatial differentiation status in this region was analyzed. The results demonstrate as follows: The rocky desertification risk grade of this area presents a trend of decrease from west to east. Serious rocky desertification risk regions are widespread in the southwest of Guizhou Province and east of Yunnan Province, thinly distributed in upstream of Jialing River in south-east of Gansu Province and part of Chongqing City. The middle degree areas of rocky desertification risk mainly are distributed in the south-east of Sichuan Province, the east of Sichuan Province, the west of Chongqing City, most part of Guizhou Province and a part of mid-and up-stream of Jialing River. The light regions of rocky desertification risk mainly are distributed in Sichuan basin and hilly mountain area, a part of south of Shaanxi province, the east of Chongqing City and west of Hunan and Hubei provinces. No rocky desertification risk regions mainly are distributed in the north and the east of Hubei Province and most part of Jiangxi Province. Results can be served as a basis for integrated rocky desertification control in up and middle stream of Yangtze River for the future.