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

doi:10.1002/met.1950

	Assessment of drought impacts on crop yields across Nepal during 1987-2017
	Hamal, Kalpana 1,2; Sharma, Shankar 3; Khadka, Nitesh 1,4; Haile, Gebremedhin Gebremeskel 1,5,6; Joshi, Bharat Badayar 7,8; Xu, Tianli 8; Dawadi, Binod 3,8
刊名	METEOROLOGICAL APPLICATIONS
	2020-09-01
卷号	27 期号:5 页码:18
关键词	agriculture drought Nepal precipitation SPEI SYRS
ISSN号	1350-4827
DOI	10.1002/met.1950
通讯作者	Dawadi, Binod(binod.dawadi@cdhm.tu.edu.np)
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 similar to 27% of Nepal s 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.
资助项目	Belt and Road scholarship ; CAS-TWAS President's Fellowship ; Kathmandu Center for Research and Education, Chinese Academy of Sciences - Tribhuvan University
WOS关键词	PRECIPITATION EVAPOTRANSPIRATION INDEX ; VEGETATION CONDITION INDEX ; AGRICULTURAL DROUGHT ; EXTREME PRECIPITATION ; RISK-ASSESSMENT ; CLIMATE TRENDS ; TIME SCALES ; RIVER-BASIN ; VARIABILITY ; CHINA
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	WILEY
WOS记录号	WOS:000588437300001
资助机构	Belt and Road scholarship ; CAS-TWAS President's Fellowship ; Kathmandu Center for Research and Education, Chinese Academy of Sciences - Tribhuvan University
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/156493]
专题	中国科学院地理科学与资源研究所
通讯作者	Dawadi, Binod
作者单位	1.Univ Chinese Acad Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Atmospher Phys, Int Ctr Climate & Environm Sci, Beijing, Peoples R China 3.Tribhuvan Univ, Cent Dept Hydrol & Meteorol, Kirtipur, Nepal 4.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Peoples R China 5.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China 6.Tigray Agr Res Inst, Mekelle, Ethiopia 7.Chinese Acad Sci, Inst Tibetan Plateau Res, Natl Tibetan Plateau Data Ctr, Beijing, Peoples R China 8.Tribhuvan Univ, Kathmandu Ctr Res & Educ, Chinese Acad Sci, Kathmandu, 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):18.
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),18.
MLA	Hamal, Kalpana,et al."Assessment of drought impacts on crop yields across Nepal during 1987-2017".METEOROLOGICAL APPLICATIONS 27.5(2020):18.