不同植被指数对旱情监测的敏感性比较

doi:10.14088/j.cnki.issn0439-8114.2021.03.005

摘要/Abstract

摘要： 选择巢湖流域为研究区,基于2008—2015年6—9月的月合成MODIS产品分别计算归一化植被指数（NDVI）、距平植被指数（AVI）和条件植被指数（VCI）,并以降水距平百分率（Pa）作为判别植被指数监测旱情敏感性的标准,利用Pa分析了流域内的干旱情况,以干旱期间为例开展了干旱期间不同植被指数与降水距平百分率的相关性分析。结果显示,2009年和2013年发生了较为严重的干旱,其中9月为 6—9月内较易发生干旱的月份;在2009年9月和2013年9月干旱期间,NDVI与Pa 的空间分布相关性表现不明显,AVI和VCI与Pa的分布有明显的一致性规律,且VCI和Pa的相关性最高,表明其对旱情监测的敏感性最高。

关键词: 旱情监测, 植被指数, 降水距平百分率, 敏感性

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

中图分类号:

TP79
S423

王敏. 不同植被指数对旱情监测的敏感性比较[J]. 湖北农业科学, 2021, 60(3): 25-30.

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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