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《Journal of Anhui Agricultural Sciences》 2009-08
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Changes of Soil Physical Properties during Karst Rocky Desertification

LU Hong-mei et al(School of Chemical Engineering,Guizhou University,Guiyang,Guizhou 550008)  
[Objective] The research aimed to discuss the changes of soil physical properties in the process of rocky desertification in Huajiang small watershed.[Method] Within the small watershed of continuous limestone area in Huajiang,Guizhou,the changes of soil physical properties during rocky desertification under the interference patterns of wood chopping and reclamation were researched.[Result] The soil of researched area was in clayey texture but in good structure,the average content of the particles,whose particle diameters were smaller than 0.001 mm,were 49.7% and the contents of water-stable aggregate,whose diameters were bigger than 0.25 mm,were higher than 60%.The soil densities of wood chopping rocky desertification were lower than 2.6 g/cm3 while that of reclamation rocky desertification were higher than 2.6 g/cm3.All the soil physical properties of wood chopping rocky desertification were superior to that of reclamation ones at the same grades,which resulted in that the resistance to washing and crushing of rain or flowing water was stronger than that of reclamation rocky desertification.The fractal dimension,mean weight diameter,structure damage rate and aggregate stability were good indexes to evaluate calcareous soil structure.[Conclusion] Along with the increasing of human disturbance,the rocky desertification grade was increased,the soil density and soil structure damage rate showed an increasing trend,and aggregate stability showed a decreasing tendency.
【Fund】: 贵州大学博士基金资助项目(X065010);; 中国科学院创新团队国际合作伙伴计划;; 科技支黔工程项目以及知识创新前沿领域项目
【CateGory Index】: S152
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