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

doi:10.1002/met.1950

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所

	Assessment of drought impacts on crop yields across Nepal during 1987–2017
	Hamal, Kalpana 1,2; Sharma, Shankar 3; Khadka, Nitesh 2,4; Haile, Gebremedhin Gebremeskel 2,5,6; Joshi, Bharat Badayar 7,8; Xu, Tianli 8; Dawadi, Binod 3,8
刊名	Meteorological Applications
	2020
卷号	27 期号:5 页码:e1950
关键词	Agricultural robots Crops Soil moisture
ISSN号	1350-4827
DOI	10.1002/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
内容类型	期刊论文
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.International Centre for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; 2.University of Chinese Academy of Sciences, Beijing, China; 3.Central Department of Hydrology and Meteorology, Tribhuvan University, Kirtipur, Nepal; 4.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China; 5.Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; 6.Tigray Agricultural Research Institute, Mekelle, Ethiopia; 7.National Tibetan Plateau Data Centre, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; 8.Kathmandu Center for Research and Education, Chinese Academy of Sciences-Tribhuvan University, Kirtipur, Nepal
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.