| Cite this article: | 尹航,张泽中,张伟杰,等.基于植被健康指数的内蒙古干旱时空特征分析及驱动因素研究[J].灌溉排水学报,0,():-. |
| YIN Hang,ZHANG Zezhong,ZHANG Weijie,et al.基于植被健康指数的内蒙古干旱时空特征分析及驱动因素研究[J].灌溉排水学报,0,():-. |
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| Study on the Spatio-Temporal Patterns of Drought and Its Driving Forces Based on Vegatation Health Index in Inner Mongolia |
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YIN Hang1, ZHANG Zezhong2, ZHANG Weijie1, LAI Hexin2, WANG Fei2
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1.Institute of Water Resources of Pastoral Area;2.School of Water Conservancy,North China University of Water Resources and Electric Power
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| Abstract: |
| 【Objective】To study the spatial and temporal evolution characteristics of drought and its driving factors in Inner Mongolia from 1982 to 2020, so as to provide a reference basis for the rational use of local water resources and disaster prevention and mitigation. 【Method】Based on the vegetation health index (VHI) in Inner Mongolia from 1982 to 2020, the temporal and spatial characteristics of drought in this region were investigated, and the cross-wavelet method was used to analyze the driving effects of El Ni?o-Southern Oscillation (ENSO), Arctic Oscillation (AO) and sunspots on drought. 【Result】①The drought showed a certain alternation characteristic in Inner Mongolia, and was aggravating with the most obvious trend of aridity in summer; the first and the second main cycle were 8a and 12a, respectively. ②The drought was more serious in the northern part of central Inner Mongolia. ③The drought showed an obvious worsening trend in the middle and northeast regions, and exhibited an alleviating trend in the southern regions. ④During the study period, a total of 11 drought events occurred in Inner Mongolia, with the most severe one occurring from October 1989 to March 1990; the worst and least severe droughts occurred in the 1980s and 2010s, respectively. ⑤There was a correlation between atmospheric circulation factors and sunspots and drought in Inner Mongolia, and ENSO had the greatest effect on drought, while sunspots had the least effect on drought. 【Conclusion】During 1982-2020, the drought showed an aggravating trend with periodic characteristics, and ENSO had the greatest influence on drought in Inner Mongolia. |
| Key words: drought; vegetation health index; spatial-temporal evolution; driving force analysis; Inner Mongolia |
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