| Ecology and Economics |
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| Vegetation Coverage Variations in Ningxia during 1999-2009 and Its Relationships with Climatic Factors |
| DU Ling-tong1,2, TIAN Qing-Jiu1 |
1.International Institute for Earth System Science, Nanjing University, Nanjing 210093, China;
2.Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in North-western China, Ningxia University, Yinchuan 750021, China |
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Abstract We calculated the vegetation coverage of Ningxia based on the 10-day SPOT VGT NDVI data from 1999 to 2009, and analyzed its variation by use of regression analysis and mean absolute deviation indices. The relationship between vegetation coverage and regional climate factors was also analyzed based on the meteorological observation data of the corresponding period. Results showed that the vegetation coverage was relatively high in the Liupanshan Mountains area of southern Ningxia and Yellow River irrigation area of northern Ningxia, and low in arid zone of middle Ningxia, but there was a large absolute deviation rate in the middle zone during 1999-2009. The vegetation coverage in most areas of Ningxia increased in the recent 11 years. The vegetation coverage variations are related to climatic factors. Firstly, the fluctuations of precipitation influence the vegetation coverage variations. Except in Liupanshan Mountains area and Yellow River irrigation area, there are significantly positive correlations between vegetation coverage and precipitation in the other areas of Ningxia. Secondly, the increase of effective accumulated temperature can promote crops growth and lead to regional vegetation coverage increasing. In the agricultural irrigation areas, there are also positive correlations between vegetation coverage and annual mean temperature.
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Received: 11 February 2012
Published: 20 September 2012
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2012, Vol. 32 
