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Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (26): 106-111.doi: 10.11924/j.issn.1000-6850.casb20190800521

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Response of VCI to SPEI at Different Time Scales from 2000 to 2017 in Inner Mongolia

Qu Xuebin1,2(), Yang Shuxiang2, Wang Yanping2, Zou Xiaohua3   

  1. 1Lanzhou Institute of Arid Meteorology, China Meteorological Administration/Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu/Key Laboratory of Arid Climate Change and Reducing Disaster of China Meteorological Administration, Lanzhou 730020
    2Hulun Buir Meteorological Bureau, Hulunbuir Inner Mongolia 021008
    3Inner Mongolia Daxinganling Forestry Bureau, Hulunbuir Inner Mongolia 021008
  • Received:2019-08-12 Revised:2019-10-22 Online:2020-09-15 Published:2020-09-14

Abstract:

To understand the response of different vegetation types to meteorological drought indices at different time scales in Inner Mongolia, the authors calculated the correlation between VCI and the SPEI of 30, 60, 90, 120 and 150 days time scale through using the monitoring data of 82 weather stations in Inner Mongolia and the MOD13Q1 vegetation monitoring products of NASA from 2000 to 2017. The results showed that the annual average variation of SPEI was basically the same in five different time scales, but annual variation trend was not obvious. The annual average VCI showed an extremely significant upward trend, its change tendency rate reached 0.129/10 a, and the vegetation condition was significantly improved. Different vegetation cover types were not sensitive to the effects of meteorological drought from late April to mid-May in Inner Mongolia. In late May, grassland VCI and SPEI showed significant or extremely significant positive correlation. In the middle of June, the cultivated land VCI was significantly or vey significantly positively correlated with SPEI. The study between VCI and SPEI at different time scales indicated that SPEI60 and SPEI90 should be used to monitor and predict the drought of grassland and cultivated land in Inner Mongolia, respectively, while the correlation between VCI and SPEI in forest and desert was declining, indicating that the impact of meteorological drought was not significant.

Key words: Inner Mongolia, meteorological drought, remote sensing vegetation drought, correlation analysis

CLC Number: