首页|Soil Erosion and Its Basic Characteristics at Karst Rocky-desertified Land Consolidation Area: A Case Study at Muzhe Village of Xichou County in Southeast Yunnan,China
Soil Erosion and Its Basic Characteristics at Karst Rocky-desertified Land Consolidation Area: A Case Study at Muzhe Village of Xichou County in Southeast Yunnan,China
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Xichou County of Wenshan Zhuang and Miao Autonomous Prefecture in southeast Yunnan is one of the karst mountainous areas in southwest China showing typical rock desertification.During this study,we set up three soil erosion contrast test spots at Muzhe Village,Benggu Township,Xichou County,which was the birthplace of the Xichou rock-desertified land consolidation mode.The three spots included the terrace land spot(already consolidated land),sloping land spot(unconsolidated sloping land under rock desertification),and standard runoff spot(bare land spot).In 2007,a whole-year complete observation was conducted during the rainy season and"rainfall-erosion"data were obtained for39 times.Our analysis showed that during the entire observation period,the number of the rainfalls that led to soil erosion accounted for 34.04% of the number of all rainfalls and the amount of the rainfalls that led to soil erosion accounted for 84.17% of the total amount of all rainfalls.The average erosive rainfall standard in the three test spots was 11.0 mm,slightly higher than the 10 mm standard that has been adopted all over China,but lower than the 12.7 mm standard of the US and the 13.0 mm standard of Japan.According to single-factor analysis,the soil loss in the sloping land spot(L2)and that in the bare land spot(L3)are correlated to certain extent to many other factors,including the single precipitation(P),rainfall intensity during the maximum ten minutes(I10),rainfall intensity during the maximum 20minutes(I20),rainfall intensity during the maximum30 minutes(I30),rainfall intensity during the maximum 40 minutes(I40),and rainfall intensity during the maximum 6o minutes(I60).Among these factors,they are of the highest relativity with I60.According to double-factor analysis,both L2and L3are of good relativity with P and I60.According to multi-factor analysis,L2 and L3 are also of good relativity with seven rainfall indexes,namely,P,Ia(average rainfall intensity),I10,I20,I30,I40,and I60,with their related coefficient R reaching 0.906 and0.914,respectively.The annual soil losses in the three terrace land spot,which indicates a low-level erosion;(unconsolidated spot),some 12.5 times than that in the terrace land spot,which indicates an bare land spot,some 18.9 times than that in terrace land spot,indicating an acute erosion.These figures fully show that the Xichou rock-desertified land consolidation mode plays a significant role in soil conservation.
karst mountainous arearock desertificationland consolidationsoil erosiontest spotXichou County
YANG Zisheng、YANG Longfei、ZHANG Bosheng
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Institute of Land & Resources and Sustainable Development,Yunnan University of Finance and Economics,Kunming 650221,China
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