| 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,2023,42(8):80-89. |
| 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,2023,42(8):80-89. |
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| 摘要: |
| 【目的】探究内蒙古地区1982—2020年干旱时空演变特征及驱动因素。【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分析该区域干旱时空特征，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增加趋势，夏季干旱化趋势最明显。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8、12 a。②内蒙古中部偏北地区的旱情较为明显。③干旱明显加重地区主要位于内蒙古中部及东北部少许地区，南部呈干旱减轻趋势。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—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：10.13522/j.cnki.ggps.2022641 |
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| Using Vegetation Health Index to Calculate Spatiotemporal Variation in Drought and Its Determinants in Inner Mongolia |
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YIN Hang, ZHANG Zezhong, ZHANG Weijie, LAI Hexin, WANG Fei
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1. Institute of Water Resources of Pastoral Area, Hohhot 010018, China; 2. Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 3. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China
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| Abstract: |
| 【Objective】Drought is the most important abiotic stress affecting crop production in North China. Understanding its characteristics is essential to agricultural management. This paper is to investigate the spatiotemporal variation in drought from 1982 to 2020 and its underlying determinants in Inner Mongolia. 【Method】The vegetation health index (VHI) measured from 1982 to 2020 was used to analyze the temporal and spatial characteristics of the drought. The cross-wavelet method was used to elucidate the effects of El Ni?o-Southern Oscillation (ENSO), Arctic Oscillation (AO), and sunspots on the drought. 【Result】 Drought in the studied region varied intra-annually, with the most severe droughts occurring in the summer. The main drought period is 8 years and 12 years. The central-northern region in Inner Mongolia experienced more severe droughts than other regions. Drought was more severe in the middle and northeast, while the south had seen a relief in drought. The region had witnessed a total eleven droughts in the studied period, with the most severe droughts occurring from October 1989 to March 1990. The worst and least severe droughts were in the 1980s and 2010s, respectively. Atmospheric circulation and sunspots correlated with the drought, with ENSO having the greatest influence and sunspots having the least impact on drought. 【Conclusion】From 1982 to 2020, drought in Inner Mongolia had been worsening. ENSO influences drought most. These findings improve our understanding of the reasons behind the droughts and can help improve effective drought management in Inner Mongolia. |
| Key words: drought; vegetation health index; spatial-temporal evolution; driving force analysis; Inner Mongolia |
