JOURNAL OF NATURAL RESOURCES ›› 2021, Vol. 36 ›› Issue (2): 459-475.doi: 10.31497/zrzyxb.20210215

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Remote sensing monitoring and analysis of influencing factors of drought in Inner Mongolia growing season since 2000

QIN Yi1(), ZHANG Ting-bin1,2(), YI Gui-hua3, WEI Peng-tao1, YANG Da1   

  1. 1. College of Earth Science, Chengdu University of Technology, Chengdu 610059, China
    2. The Engineering & Technical College of Chengdu University of Technology, Leshan 614000, Sichuan, China
    3. College of Management Science, Chengdu University of Technology, Chengdu 610059, China
  • Received:2019-05-30 Revised:2019-09-27 Online:2021-02-28 Published:2021-04-28
  • Contact: ZHANG Ting-bin E-mail:yiqin0110@163.com;zhangtb@cdut.edu.cn

Abstract:

This article takes Inner Mongolia Autonomous Region as the research area. The Ts-NDVI space is created by using MODIS 16d synthetic vegetation index product data MOD13A2 and 8d synthetic surface temperature product data MOD11A2. Additionally, based on the temperature vegetation dryness index (TVDI) in Inner Mongolia during 2000-2017 growing season, the spatiotemporal characteristics of drought in the study area are analyzed, and the influencing factors of drought are discussed by using air temperature and precipitation data. The results show that: (1) The average TVDI of Inner Mongolia was 0.6 in the growing season from 2000 to 2017, and the area of heavy and moderate drought was the largest, during which 2007 and 2010 are the years with the most severe drought. The spatial differentiation of drought was obvious. The moderate and slight drought mainly occurred in the central and southwest parts, respectively, and severe drought was observed in the Hulun Buir grassland to the west of Da Higgan Mountains. (2) In the past 18 years, the drought degree in Inner Mongolia showed a slight increase trend, and the interannual variation θslope ranged from -0.07 to 0.7. (3) In the growing season of 2017, drought was most serious in June and September, and drought occurred frequently and severely in the Hulun Buir grassland and western Ordos Plateau. (4) TVDI is positively correlated with the average temperature, negatively correlated with the cumulative precipitation and slightly negatively correlated with the slope, positively correlated with the elevation of less than 1300 m, and negatively correlated with the elevation of greater than 1300 m. The analysis of partial correlation between TVDI and climatic factors in Inner Mongolia growing season shows that the drought in northern Sonid Left Banner of Xilin Gol League, Oroqen Autonomous Banner and Hulun Buir grassland has a significant positive correlation with temperature (P<0.01), and that in northeastern Xilin Gol League has a significant negative correlation with precipitation (P<0.01); among the climatic factors, the average temperature has a stronger impact on drought than cumulative precipitation does.

Key words: temperature vegetation dryness index (TVDI), drought, climatic factor, remote sensing, Inner Mongolia