地理学报 ›› 2006, Vol. 61 ›› Issue (9): 911-918.doi: 10.11821/xb200609002

• 青藏高原气候环境 • 上一篇    下一篇

西藏冻融侵蚀分级评价

张建国1, 刘淑珍2, 杨思全3   

  1. 1. 南通大学地理科学学院,南通 226007;
    2. 中国科学院成都山地灾害与环境研究所,成都 610041;
    3. 民政部国家减灾中心,北京 100053
  • 收稿日期:2006-05-18 修回日期:2006-07-18 出版日期:2006-09-25 发布日期:2010-09-01
  • 作者简介:张建国 (1973-), 男, 甘肃陇西人, 博士, 讲师, 主要研究方向为生态环境动态监测。E-mail: sezjg@yahoo.com.cn
  • 基金资助:

    国家重大基础研究前期研究专项 (2004CCA03600)

Classification and Assessment of Freeze-thaw Erosion in Tibet

ZHANG Jianguo1, LIU Shuzhen2, YANG Siquan3   

  1. 1. School of Geography, Nantong University, Nantong 226007, Jiangsu, China;
    2. Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China;
    3. National Disaster Reduction Center, MCA, Beijing 100053, China
  • Received:2006-05-18 Revised:2006-07-18 Online:2006-09-25 Published:2010-09-01
  • Supported by:

    Early-Stage Research on Key Basic Research Projects of China, No.2004CCA03600

摘要:

冻融侵蚀是仅次于水蚀和风蚀的第三大土壤侵蚀类型,由于受诸多因素限制,到目前为止,国内外对其研究甚少,有关其强度分级评价方面的研究则更为鲜见。本文在综合分析冻融侵蚀影响因子的基础上,选取气温年较差、坡度、坡向、植被、年降水量、土壤等六个因子作为西藏冻融侵蚀分级评价指标,用加权加和的方法建立了适合西藏自治区的冻融侵蚀相对分级评价模型,并在地理信息系统软件的支持下实现了西藏自治区冻融侵蚀相对分级。最后,利用分级结果对西藏自治区冻融侵蚀进行了综合评价。结果表明,西藏冻融侵蚀具有分布范围广,不同强度冻融侵蚀空间分异明显,冻融侵蚀地区分布差异明显等特点。

关键词: 西藏, 冻融侵蚀, GIS, 分级评价

Abstract:

Freeze-thaw erosion is the third largest soil erosion type after water erosion and wind erosion. Up to now, being restricted by many factors, few researches on freeze-thaw erosion have been done at home and abroad, especially on the assessment method of freeze-thaw erosion. Based on the comprehensive analysis of impact factors of free-thaw erosion, this paper chooses six indexes, including the annual temperature range, annual precipitation, slope, aspect, vegetation and soil, to build the model for relative classification of freeze-thaw erosion using weighted and additive methods and realizes the relative classification of the freeze-thaw erosion in Tibet with the support of GIS software. Then a synthetic assessment of freeze-thaw erosion in Tibet has been carried out according to the relative classification result. The result shows that the distribution of freeze-thaw erosion area is very extensive, accounting for 55.3% of the total land area of Tibet. The spatial differentiation of freeze-thaw erosion with different intensities is obvious and the difference in distribution among different freeze-thaw areas is also obvious.

Key words: Tibet, freeze-thaw erosion, GIS, classification and assessment