Comparison of sensibility of different vegetation indices for monitoring drought

doi:10.14088/j.cnki.issn0439-8114.2021.03.005

Abstract

Abstract: Chaohu basin was selected as study area.Normalized difference vegetation index（NDVI）,anomaly vegetation index（AVI） and vegetation condition index（VCI） were separately calculated based on monthly composite MODIS product. Precipitation anomaly percentage （Pa） derived from precipitation data of weather stations was used as reference data to estimate drought sensibility of various vegetation indices. The drought situation of the basin was analyzed by Pa, and then the correlation between vegetation indices and Pa during the drought was analyzed. Results showed that,droughts occurred in 2009 and 2013 at relatively severe extent, in which September was the most vulnerable month to drought comparing to June,July and August. The correlation between NDVI and Pa of spatial distribution was not significant, while AVI,VCI and Pa displayed relatively consistent distribution in September 2009 and September 2013. In addition, VCI was found to perform best with highest correlation coefficients across Pa among three vegetation indices,which demonstrated the highest sensibility to drought.

Key words: drought monitoring, vegetation index, precipitation anomaly percentage, sensibility

CLC Number:

TP79
S423

WANG Min. Comparison of sensibility of different vegetation indices for monitoring drought[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(3): 25-30.

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