Journal of Ecology and Rural Environment ›› 2020, Vol. 36 ›› Issue (1): 81-88.doi: 10.19741/j.issn.1673-4831.2019.0130

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Comparison of 4 Remote Sensing Drought Indexes for Drought Monitoring in Eastern Inner Mongolia

QU Xue-bin1,2, WU Hao1, YUE Kun3, LIU Peng-tao3, LI Xi-ran4   

  1. 1. Hulun Buir Meteorological Bureau, Hulun Buir 021008, China;
    2. Lanzhou Institute of Arid Meteorology, China Meteorological Administration/Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province/Key Laboratory of Arid Climate Change and Reducing Disaster of China Meteorological Administration, Lanzhou 730020, China;
    3. Inner Mongolia Ecology and Agro-meteorology Center, Hohhot 010051, China;
    4. Morin Dawa Meteorological Bureau of Daur Autonomous Banner, Hulun Buir 162850, China
  • Received:2019-03-07 Published:2020-01-17

Abstract: The eastern part of Inner Mongolia is a high-risk area for drought disasters, it is necessary to use remote sensing to monitor drought conditions. In order to study the applicability of different remote sensing drought indices in eastern Inner Mongolia, MODIS data in the eastern part of Inner Mongolia from late April to late September 2016 were used to calculate four commonly used remote sensing drought indices:temperature condition index (TCI),vegetation condition index (VCI),temperature vegetation drought index (TVDI) and vegetation supply water index (VSWI), and compared with meteorological drought composite index (MCI) and soil relative humidity data. The results show that TCI and VCI had a large deviation in drought monitoring at the beginning of the growing season due to the different reviving periods. The drought indices were basically consistent with drought in the middle and late growth seasons. VCI and MCI had the highest correlation with soil relative humidity. The consistency of MCI with VCI and VSWI was higher in the middle and low coverage grassland, while the highest consistency with TCI was toward to the middle and high coverage grassland. Combined with the characteristics of various drought indices, VSWI is recommended for drought monitoring in eastern Inner Mongolia during the early growing season, and VCI or TCI is recommended for drought monitoring in the middle and late growth season.

Key words: drought, remote sensing, drought index, eastern Inner Mongolia

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