| 沙漠与沙漠化 |
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| Wind-breaking Effect of Various Conservation Tillage Measures during Fallow Period of Cropland |
LIU Mu-xing1,2,3, LIU Lian-you1,2,3, WANG Jing-ai1,4, YAN Ping1,2,3, YANG Xiu-chun1,2,3, QI Xing-fen5, SONG Yang1,2,3, HU Xia1,2,3
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| 1.Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education, Beijing Normal University, Beijing 100875, China; 2.College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China; 3.China Center for Desert Research, Beijing Normal University, Beijing 100875, China; 4.College of Geography and Remote Sensing Sciences, Beijing Normal University, Beijing 100875, China; 5.Department of Geography of Dezhou College, Dezhou 253023, Shandong, China |
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Abstract
Conservation tillage is essential for soil wind erosion control in the semi-arid area, whereas more studies are needed on the mechanism of different conservation tillage measures to prevent wind erosion. Through field test, we observed wind profiles of 0 to 4 m under seven kinds of conservation tillage, i.e. subsoil tillage, shallow ploughing, stalk mulch after ploughing, no till with tall rape stubbles, no till with short rape stubbles, no till with tall wheat stubbles, no till with short wheat stubbles, and conventional tillage and pasture for comparison. Five items of aerodynamic roughness, friction velocity, and absolute and relative fluctuation intensity of wind velocity were analyzed comparatively on all the underlying surfaces. The results indicated that remnant stubble could reduce soil erosion by reducing near surface wind shear stress. In addition, the height, density and perpendicularity of remnant stubble, straws and grass had influence on aerodynamic roughness and wind velocity fluctuation on different underlying surfaces.
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Received: 08 September 2005
Published: 20 January 2007
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2007, Vol. 27 
