| 生物土壤与生态 |
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| Simulation Method of Vegetation Coverage in Arid Sandy Grassland: Ⅱ. Application |
MO Zhen-zhen1, HE Li-min2, LI Zhen-shan1,2
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| 1.The Key Laboratory for Environmental and Urban Sciences, Shenzhen Graduate School, Peking University, Shenzhen 518055, China; 2.Department of Environmental Engineering, Peking University; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China |
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Abstract A mechanism model is set up based on the characteristics of vegetation cover change on sandy grassland in arid region. The study on the sandy grassland in the lower reaches of the Manas River in Xinjiang Autonomous Region was made by using this model. The simulation included changes of soil water supply and vegetation cover in the term from July, 1999 to July, 2000. The results are verified by NOAA/AVHRR satellite data and GIS technology. The average vegetation coverage of the study area varies from 10% to 35%. The lowest value appears in April with the value lower than 10%, and the highest value appears in July with an average above 30%. Areas with high vegetation coverage are mostly distributed in south and east part of the study area as well as the low edge of the desert. The most of the study area, with a portion of 63.73 percent, has the vegetation coverage value between 10%~30%, and other classes of vegetation coverage value have a portion of around one tenth of the study area. Compared with the remote sensing data, the model is proved to be practical. The simulation results can reflect the real change of vegetation coverage.
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Received: 26 July 2007
Published: 20 May 2008
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2008, Vol. 28 
