JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (8): 1315-1322.

### 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

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.

CLC Number:

• S158.1