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| Normalized vegetation index analysis in Wenchuan earthquake areas |
| （Agricultural Meteorological Center of Sichuan Province, 610072, Chengdu, China） |
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Abstract Normalized difference vegetation index (NDVI) which was extracted from MODIS/EOS data was used to synthetize the ten days maximum NDVI and then vegetation of heavy disaster areas in earthquake was analyzed. Results showed that vegetation in west and northern mountain areas of Sichuan basin grew naturally and there was a stable boundary which could distinguish western mountain areas of basin from farmland areas labeled by ten days maximum NDVI during the late April to the end of May in 2007 that before the earthquake. Before the earthquake in 2008, ten days maximum NDVI in late April was better than that in early May. In middle May when the earthquake occurred, ten days maximum NDVI was significantly reduced in the junction mountain areas at the Chengdu plain and Deyang and Aba prefecture, but in the late May, ten days maximum NDVI was reduced in basin. In May 2009 the middle ten maximum vegetation indexes were the best; in late May, the basin ten maximum vegetation index values decreased. The three years data showed that the stable boundary between the western mountain and farmland areas in basin labeled by the ten days maximum NDVI was destructed.
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Received: 15 December 2012
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