| 沙漠与沙漠化 |
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| HulunBuir Sandy Grassland Blowouts (Ⅲ): Influence of Soil Layer and Microrelief |
| ZHANG A MungkDalai1,2, WANG Xiao-ke1, U. Hurrle3, FENG Zong-wei1 |
| 1.Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 2.Bureau of Land and Resources of HulunBuir City, HulunBuir 021008, Inner Mongolia, China; 3.Primary Education College of HulunBuir University,HulunBuir 021000, Inner Mongolia, China |
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Abstract Thickness, compactness and grain composition of top soil layer were tested along sections across west Hailar, HulunBuir sandy grassland to determine how blowouts are controlled by microrelief and top soil layer. It was discovered that when west wind prevails, blowouts mostly develop in the upper to middle parts of SW and S slopes. Blowouts could also develop in flat sandy grasslands, N and E slopes, and even in low lands when initiated by human activities of plowing and motor vehicle natural roads which cut soil layer and let the underlying sand expose to and gain energy from strong wind. There is a coarsened layer in middle of top soil layer that is considered to be the result of an ancient aeolian erosion process. The coarsened layer, loose and low in compactness, is vulnerable to wind erosion and easy to form sand flow to break the calcic horizon the bottom soil, crucial to sandy grassland blowout formation. Sandy grassland is fragile geo-ecosystem. The middle and upper parts of W, SW, and S slopes, ridges and hillocks on grasslands are dangerous regions for aeolian erosion. The top soil layer is the rarest natural resource, and the soil-root layer is the most precious ecosystem on arid and semiarid sandy grasslands. The protection of top soil layer has utter most importance in protection of grassland resources and ecosystem, and in prevention of sandy desertification.
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Received: 08 July 2005
Published: 20 January 2007
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2007, Vol. 27 
