自然资源学报 ›› 2011, Vol. 26 ›› Issue (8): 1315-1322.doi: 10.11849/zrzyxb.2011.08.006

• 资源利用与管理 • 上一篇    下一篇

岩溶区土壤允许流失量与土地石漠化的关系

白晓永1,2, 王世杰1,2   

  1. 1. 中国科学院 地球化学研究所, 环境地球化学国家重点实验室, 贵阳 55000;
    2. 中国科学院 普定喀斯特生态系统观测研究站, 贵州 普定 562100
  • 收稿日期:2010-11-24 修回日期:2011-01-19 出版日期:2011-08-20 发布日期:2011-08-20
  • 通讯作者: 王世杰(1966-),男,浙江温岭人,研究员,博士生导师,博士,主要从事岩溶生态环境研究。E-mail:wangshijie@vip.skleg.cn E-mail:wangshijie@vip.skleg.cn
  • 作者简介:白晓永(1978-),男,河北石家庄人,博士,助研,研究方向为岩溶环境与土地利用。E-mail:baixiaoyong@126.com
  • 基金资助:

    中国科学院战略性先导科技专项重大课题(XDA05070400);国家自然科学基金项目(41001162);贵州省社会发展科技攻关计划项目(黔科合SY字(2011)3076号);贵州省省长基金项目(黔省专合字2010-95)。

Relationships between Soil Loss Tolerance and Karst Rocky Desertification

BAI Xiao-yong1,2, WANG Shi-jie1,2   

  1. 1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, CAS, Guiyang 55000;
    2. Puding Monitoring and Research Station for Karst Ecosystem, CAS, Puding 562100, China
  • Received:2010-11-24 Revised:2011-01-19 Online:2011-08-20 Published:2011-08-20

摘要:

为了解岩溶区土壤允许流失量(T值)与土地石漠化的关系,根据岩溶土壤圈系统论,采用实地调查与GIS空间分析技术,结合贵州碳酸盐岩岩石组合类型测算了T值,并探讨了其对石漠化的影响。结果发现:①岩溶区的T值可分为三大类,在极纯、较纯和不纯的碳酸盐岩地区,T值分别为20、100和250 t·km-2·a-1,在无土可流、完全是石山的地区,T值只有几吨或更低;②在T=20、100和250 t·km-2·a的地区,石漠化发生率分别为29.86%、28.12%和23.25%,石漠化严重度分别为73.55%、60.57%和52.19%。因此,岩溶区的T值总体偏小,且具有多样性和异质性的空间分布特点;在相同社会背景下或不考虑人类活动的干扰差异,T值对石漠化的发生率和严重度有明显影响,T值越低,阈值越小,抗干扰能力越弱,石漠化的发生率越高,程度也越严重。

关键词: 土壤流失, 侵蚀, 岩溶, 土地石漠化

Abstract:

To understand the relationships between soil loss tolerance (T value) and karst rocky desertification (KRD), T value was calculated using digital-distribution map of carbonate rock assemblages types in this paper, based on pedospheric system theory. And the impacts of T value on KRD were discussed also based on GIS and field survey comprehensively. The results showed that: 1) T values in karst areas can be divided into three categories, which are 20,100 and 250 t·km-2·a-1 respectively in the purest, purer and nonpure carbonate rock areas but only less than 20 t·km-2·a-1 in rocky mountain region. 2) In the three carbonate areas where T=20,100 and 250 t·km-2·a-1 respectively, KRD incidence rates are 29.86%, 28.12% and 23.25% with KRD severity being 73.55%, 60.57% and 52.19%. Therefore, T value in karst areas is very low, and has such characteristics as diversity and heterogeneity in spatial distribution. T value has great impacts on incidence rate and severity of rocky desertified land. In the same social context, or neglecting the differences of human activities, the lower T value is, the smaller the threshold, the weaker anti-jamming capability is, the higher KRD incidence rate is, and the more KRD severity is.

Key words: soil loss, erosion, karst, karst rocky desertification

中图分类号: 

  • S158.1