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Assessment of drought impacts on crop yields across Nepal during 1987–2017

文献类型：期刊论文

作者Hamal, Kalpana1,4; Sharma, Shankar3; Khadka, Nitesh1,2; Haile, Gebremedhin Gebremeskel1,7,8; Joshi, Bharat Badayar5,6; Xu, Tianli5; Dawadi, Binod3,5
刊名Meteorological Applications
出版日期2020
卷号27期号:5页码:e1950
关键词Agricultural robots Crops Soil moisture
ISSN号1350-4827
DOI10.1002/met.1950
产权排序4
文献子类Article
英文摘要Drought influences agriculture, hydrology, ecology and socio-economic systems globally. As agriculture is the primary source for livelihoods and contributes to ~27% of Nepals total gross domestic product, it is essential to understand the impact of drought on maize and wheat crop yields to minimize the drought-related risks. This study presents insights about agricultural drought across Nepal during 1987–2017 using the Standardized Precipitation Evapotranspiration Index (SPEI). The temporal evolution of SPEI time series has revealed frequent occurrences of drought episodes during the cropping cycle of summer maize and winter wheat crops. Moreover, the turning point of the drought was detected in 2000 (1987–2000, 2001–2017) in different regions. The averaged frequency for the SPEIs (1, 3, 6 and 12) of drought years for summer maize (winter wheat) in the western, central and eastern regions increased by 13% (12.5%), 6% (7.5%) and 7% (8%), respectively, from 1987–2000 to 2001–2017. The relationship between Standardized Yield Residual Series, the detrended SPEI at 1–12 lags and soil moisture was observed for both crops. The most correlated crop growth period for summer maize and winter wheat was the sowing and growing period, respectively, indicating the sensitive period of water deficit. Besides, the correlation performed in the two sub-periods (1987–2000 and 2001–2017) shows that drought impacts increased in the western and central regions, whereas they substantially decreased in the eastern region during the cropping period of summer maize. However, the drought sensitivity for winter wheat was decreased in the western region but significantly increased in the central and eastern regions of Nepal. The results of this study provide important information useful for policymakers in monitoring and mitigating the drought-related risks on maize and wheat crops in Nepal. © 2020 The Authors. Meteorological Applications published by John Wiley & Sons Ltd on behalf of the Royal Meteorological Society.
电子版国际标准刊号1469-8080
语种英语
WOS记录号WOS:000588437300001
源URL[http://ir.imde.ac.cn/handle/131551/46870]  
专题中国科学院水利部成都山地灾害与环境研究所
通讯作者Dawadi, Binod
作者单位1.University of Chinese Academy of Sciences, Beijing, China;
2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China;
3.Central Department of Hydrology and Meteorology, Tribhuvan University, Kirtipur, Nepal;
4.International Centre for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;
5.Kathmandu Center for Research and Education, Chinese Academy of Sciences-Tribhuvan University, Kirtipur, Nepal
6.National Tibetan Plateau Data Centre, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China;
7.Tigray Agricultural Research Institute, Mekelle, Ethiopia;
8.Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China;
推荐引用方式
GB/T 7714		 Hamal, Kalpana,Sharma, Shankar,Khadka, Nitesh,et al. Assessment of drought impacts on crop yields across Nepal during 1987–2017[J]. Meteorological Applications,2020,27(5):e1950.
APA Hamal, Kalpana.,Sharma, Shankar.,Khadka, Nitesh.,Haile, Gebremedhin Gebremeskel.,Joshi, Bharat Badayar.,...&Dawadi, Binod.(2020).Assessment of drought impacts on crop yields across Nepal during 1987–2017.Meteorological Applications,27(5),e1950.
MLA Hamal, Kalpana,et al."Assessment of drought impacts on crop yields across Nepal during 1987–2017".Meteorological Applications 27.5(2020):e1950.

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来源：成都山地灾害与环境研究所

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