| 引用本文: | 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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| 摘要: |
| 【目的】研究内蒙古地区 1982 年-2020 年的干旱时空演变特征及驱动因素，为当地合理利用水资源及防灾减灾提供参考依据。【方法】基于 1982-2020 年内蒙古植被健康指数（VHI），从时间、空间及时空耦合角度对该区域干旱的时空特征进行分析，采用交叉小波方法分析厄尔尼诺-南方涛动（ENSO）、北极涛动（AO）、太阳黑子对干旱的驱动作用。【结果】①内蒙古地区干旱总体呈加重态势，夏季干旱化趋势最为明显。内蒙古干旱呈现出一定的交替性特征，第一主周期、第二主周期分别为 8a、12a。②内蒙古中部偏北地带的旱情较为明显。③干旱明显加重地区主要位于中部及东北部少许地带，南部呈现出干旱减轻趋势。④1982-2020 年，内蒙古西部、中部、东部地区分别发生了 23、20、17 场干旱事件。最严重的干旱事件发生于 1988 年 12 月至 1990 年3 月。⑤大气环流因子及太阳黑子与内蒙古干旱间均存在相关关系，ENSO 对干旱的影响最大，太阳黑子对干旱的影响最小。【结论】1982-2020 年，内蒙古干旱表现出加重趋势，具有周期性特征，且 ENSO 对干旱的影响最大。 |
| 关键词: 干旱;植被健康指数;时空演变;驱动因素分析;内蒙古 |
| DOI： |
| 分类号:P426.616 |
| 基金项目:内蒙古自治区科技计划项目——内蒙古荒漠草原区极端干旱的形成机理与监测模拟研究（2021ZY0027）、中国水利水电科学研究院基本科研业务费专项项目(MK2022J07) |
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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 |
