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《Transactions of the Chinese Society of Agricultural Engineering》 2007-12
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Effects of biological soil crust on saturated hydraulic conductivity in water-wind erosion crisscross region,North of Shaanxi Province,China

Xiao Bo1,2,Zhao Yunge1,Shao Ming'an1(1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Northwest Agriculture and Forestry University,Yangling 712100,China;2.Graduate University of the Chinese Academy of Sciences,Beijing 100039,China)  
Biological soil crust(BSC) develops extensively in water-wind erosion crisscross region on the Loess Plateau,northern Shaanxi Province of China.There are two types of BSC developing above soil surface(hypermorphs) and at soil surface(perimorphs) respectively in the region.The soil saturated hydraulic conductivity Ks of BSC and three types of control(no any crust,physical crust and removed BSC) were measured by tension infiltrometer to explore the effects of BSC on soil water infiltration and conductivity.The results show that,both two types of BSC decrease Ks remarkably compared with no crust,and the Ks between BSC and removed BSC has no significant differences. But compared with physical crust,the decrease of Ks by perimorphs is insignificant and hypermorphs is significant.It is indicated that both two types of BSC may hinder vegetation recovery and eco-environmental construction by increasing runoff and decreasing infiltration in rainfall.It is also included that the effects of BSC on soil saturated hydraulic conductivity are different compared with the different controls,which will explain the contradiction of results reported in past few years about the BSC's effects on soil water infiltration at some extent.
【Fund】: 中国科学院“西部之光”人才培养计划项目;; 国家自然科学基金青年基金(40401026、40301028);; 中国科学院“百人计划”项目
【CateGory Index】: S154
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