| 沙漠与沙漠化 |
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| Study on Land Desertification Process in Hunshandake Sandy Land |
| LIU Shu-lin, WANG Tao |
| Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences; Key Laboratory of Desert and Desertification, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract This paper conducted preliminary study on land desertification process of Hunshandake Sandy Land, using TM/ETM+ images from 1987 to 2005 and GIS software, and combining with field investigation, observation experiments and laboratory analysis. The results show that aeolian desertification was strongly developing in Hunshandake Sandy Land during the past 50 years. The desertified lands of Zhenglan Qi located in the middle of the Sandy Land expanded from 5 593.8 km2 in 1987 to 6 015.3 km2 in 2000, with the development rate of 32.4 km2·a－1. The “Sandstorm Source Control Project In and Around Beijing and Tianjin” was implemented since 2000, which restrained the developing tendency of desertification to some extent. There were 5 950.4 km2 of desertifed lands in Zhenglan Qi in 2005, and about 330.7 km2 of desertifed lands were controlled and reversed. Although the other aeolian desertified lands also were improved at different degrees, in only 5 years can not get essential change. Aeolian desertification processes of Hunshandake Sandy Land are both the process that original vegetation was replaced by psammophytes and pioneer desert plants and the process that soil coarsening toward barren and spatial redistribution. Along with the desertification degree increasing, the threshold wind velocity declined and sand transporting intensity increased, and relative high wind energy condition occurred in surface boundary layer of sandy land. The main aeolian desertification process in Hunshandake Sandy Land is reactivation of fixed\|dunes. Fixed and semi\|fixed dunes were reactivated widely through three developing types: horseshoe wind\|eroded depression, fishhook\|shaped sand dunes and catenated wind\|eroded slot, which ultimately resulted in very fragmented landscapes and shifting dunes conjoining each other in many areas. Also, wind erosion resulted from soil cultivation can not be ignored.
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Received: 07 June 2006
Published: 20 September 2007
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2007, Vol. 27 
