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.
BAI Xiao-yong, WANG Shi-jie
. Relationships between Soil Loss Tolerance and Karst Rocky Desertification[J]. JOURNAL OF NATURAL RESOURCES, 2011
, 26(8)
: 1315
-1323
.
DOI: 10.11849/zrzyxb.2011.08.012
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