2000—2018 年锡林郭勒地区干旱时空变化及其气候响应

doi:10.12118/j.issn.1000-6060.2020.05.14

Abstract

Abstract: The relationship between drought and meteorological factors is an important component in the study of arid ecosystems. Based on MODIS- TVDI data, this paper analyzed the spatiotemporal changes of drought in the Xilinguole grassland from 2000 to 2018 by combining RS and meteorological data to explore the correlation between drought and rainfall and temperature. The results show that over the 19 study period, the deviation of TVDI in the Xilinguole area first decreased and then increased, with an average TVDI value of 0.55 and a TVDI value range of 0.51- 0.61. This indicates that the Xilinguole area was in a state of light drought during that period. The areas of TVDI increase and decrease from 2000 to 2018 were 88,932 km2 and 113,647 km2, respectively, with each accounting for 43.9% and 56.1% of the total area. The average value of the Hurst index is 0.44 and the area greater than 0.44 accounts for 47.7% of the total area. The overall drought persistence is slightly weaker than the anti- persistence, and drought increased significantly in some areas, most of which were distributed in Taipusi Banner and Duolun County, from 2000 to 2018. In addition, the most obvious interannual changes occurred in 2010 and 2014 and the drought trend was particularly obvious in the typical steppe, desert steppe, and farming- pastoral ecotone lands. Additionally, the relationship between different meteorological elements and drought is different. TVDI is positively related to precipitation and temperature and TVDI is not significantly related to annual average temperature.

Key words: Temperature vegetation drought index, Drought, Time and space change, Hurst index

WU Yingjie, QUAN Qiang, CHEN Xiaojun, WANG Wenjun, ZHOU Quancheng, YIN Hang, LI Wei. Temporal and spatial variations of drought and climatic response in the Xilingol grassland from 2000 to 2018[J].Arid Land Geography, 2020, 43(5): 1289-1397.

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Temporal and spatial variations of drought and climatic response in the Xilingol grassland from 2000 to 2018

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