JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (12): 2023-2033.

• Resource Ecology •

The Response of Dynamic Change in Vegetation Coverage to Topography in Chongqing Based on MODIS EVI

ZHU Lin-fu1, XIE Shi-you1, YANG Hua2, MA Ming-guo1

1. 1. a. School of Geographic Sciences, b. Key Laboratory of the Three Gorges Reservoir Region's Eco-environment, Ministry of Education, Southwest University, Chongqing 400715, China;
2. Key Laboratory of GIS Application, Chongqing Normal University, Chongqing 401331, China
• Received:2016-11-07 Revised:2017-03-05 Online:2017-12-20 Published:2017-12-20
• Supported by:
National Key Technology Research and Development Program of the Ministry of Science and Technology of China, No.2006BAC01A16 and 2011BAC09B01; Key Program of the Natural Science Foundation of Chongqing, No.CSTC2009BA0002

Abstract: The annual change and spatial variation of vegetation coverage in Chongqing during 2000-2015 were studied based on the MODIS EVI datasets. The method of trend analysis was used, and the coefficient was corrected by topography. The response of vegetation coverage to elevation, slope and aspect were analyzed. The results showed that: 1) The coverage of vegetation was dominated by the low and medium coverage. The low coverage was in decline, while the poor, medium and high coverage was increasing. 2) A large proportion of vegetation was in increasing trend, however, with fluctuation. The proportions of the decreased, stable and increased trends of vegetation changes were 3.84%, 81.12% and 15.04%, respectively. 3) The vegetation coverage was low in the areas where the elevation was below 400 m and the slope was below 6°, however, the coverage changed significantly. There were shifts of dominant change types in the areas where the elevation was between 400 m and 1 200 m and the slope was between 6° and 15°. 4) The vegetation coverage was high and stable in the areas where the elevation above 1 200 m and the slope was above 15°. However, the vegetation coverage was decreasing in some area where the elevation was above 1 500 m and the slope was above 25°. 5) In different aspects of slopes, there was no obvious difference of the vegetation coverage change except in the flat area.

CLC Number:

• TP79