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| The Spatial and Temporal Pattern of Desertification in 1999-2010 in the Shanxi-Gansu-Ningxia Region |
| Wei Zhenfeng1,2, Ren Zhiyuan1, Zhang Chong1, Zhang Jiaqi1 |
1. College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China;
2. Guangxi University of Finance and Economics, Nanning 530003, China |
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Abstract Desertification is one of the main ecological environment problems in current. The paper discussed development situation of desertification in the Shanxi-Gansu-Ningxia Region from 1999 to 2010 and the role of human activities on land degradation, discussed the reverse of desertification problem based on the long time series of NDVI remote sensing data, focused on the characteristics of its annual dynamic change, selected the vegetation precipitation utilization as evaluation index by using time series analysis and residuals method.The results showed that most areas the vegetation function is significantly enhanced, and the ecological environment improved in nearly 12-years, especially in the middle area of Shanxi-Gansu-Ningxia region, only a handful areas appeared degradation phenomenon. The annual precipitation in 300-500 mm is suitable for vegetation ecological function in the most areas of Shanxi-Gansu-Ningxia Region. The main human activities present positive influence, the negative effect is less and account for only 1.65%. It's easy to improperly judge reversion of the desertification because the arid and semi arid desert line is not stable. Therefore, the reversion of the desertification need to be discussed in a specific time and space scales. At the same time, It is necessary to combine the climate and human activity factors.
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Received: 03 November 2013
Published: 20 September 2014
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Corresponding Authors:
任志远（Email：renzhy@snnu.edu.cn）
E-mail: renzhy@snnu.edu.cn
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2014, Vol. 34 
