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《Acta Ecologica Sinica》 2005-08
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Evolution characteristics of the artificially re-vegetated shrub ecosystem of arid and semi-arid sand dune area

WANG Xin-Ping, LI Xin-Rong, XIAO Hong-Lang, ZHANG Jing-Guang, ZHANG Zhi-Shan (Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, 260 Donggang West Rd. Lanzhou 730000, China).  
The artificially established rainfed vegetation for stabilizing the shifting sand dunes in Shapotou area since 1956, using mainly the shrubs of Caragana korshinskii, Hedysarum scoparium and Artemisia ordosica at Shapotou Desert Experimental Research Station near Lanzhou has established a dwarf-shrub and microbiotic soil crust cover on the stabilized sand dunes. Soil particle size getting thinner and fertility, the depth of microbiotic soil crust as well as the subsoil, and the volumetric soil moisture in the shallow soil profiles increased remarkably associated with the process of sand dune stabilization. On the other hand, the number of microbe, the vegetation cover and the plant species attained a maximum degree when the dunes stabilized for 40 years. The shrub numbers and the community biomass decreased when the dunes stabilized for 17 years. There is a significant positive correlation between soil particle fractal dimension and the clay content of the shallow soil profile in the artificially stabilized sand dunes, the longer the dune being stabilized, the greater the soil clay content in the shallow soil profiles (0~3 cm), the greater the soil particle fractal dimension (D=2.4083). It reflects the fact that during the re-vegetation processes, the soil structure is strengthening and tightening in the shallow soil profiles. Hence, the shifting sand dune (D=2.0484) getting more stabilized. Therefore, the fractal model could be used to describe the texture and fertility states, and the stability degree of the formerly shifting sand dune, and it could be used as an integrated quantitative index to evaluate the re-vegetation practice in the sand dune areas and its stabilization.
【Fund】: 国家自然科学基金资助项目(40301008 90202015);; 中国科学院“西部之光”人才培养计划资助项目;; 中国科学院知识创新工程重要方向资助项目(KZCX3-SW-324)~~
【CateGory Index】: Q948.1
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