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| Effects of biological soil crusts on soil air permeability and water conductivity |
| Wang Weihua1, Li Jianbo1, Wu Xiangbo2, Wang Quanjiu3,4 |
| 1.Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, China; 2.Inner Mongolia Water Resources and Hydropower Survey and Design Insitute, Huhhot, Inner Mongolia 010000, China; 3.Institute of Water Resources and Hydrologic Engineering, Xi′an University of Technology, Xi′an, Shaanxi 710048, China; 4.State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yang-ling, Shaanxi 712100, China |
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Abstract Biological soil crusts(BSCs), which develop in the semiarid water-wind erosion crisscross region of the Loess Plateau, north of Shaanxi Province, China, have great influence on soil air permeability and water conductivity. This study aims to assess the effects of biological soil crusts on soil air permeability, soil water storage capacity and infiltration rate of four types of biological crusts(no crust, BSC removed, 3 year crust and 7 year crust). The results showed that the same saturated water content corresponding to different soil air permeability, throughout the process of soil saturated water content increased and decreased, scilicet, soil air permeability in the process of water content decreased was significantly higher than the increased phase. Soil air permeability was significantly reduced by BSCs. Owingto the presence of biological soil crusts, soil total porosity and capillary porosity were increased significantly. Then soil water storage capacity was increased, but soil water permeability was declined. With the biological crust growing longer, the infiltration capacity declined more signifi-cantly. By comparing the three types of infiltration model, the coefficient of determination, R2, of Horton model was greater than that of other models, showing that Horton model fitted values are much closer to the measured values, and can better describe the soil infiltration characteristics under the co-verage of BSC in this study area.
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Received: 28 April 2015
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