气候变化领域集成服务门户(CCPortal): Assessment of drought impacts on crop yields across Nepal during 1987-2017

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DOI	10.1002/met.1950
	Assessment of drought impacts on crop yields across Nepal during 1987-2017
	Hamal, Kalpana; Sharma, Shankar; Khadka, Nitesh; Haile, Gebremedhin Gebremeskel; Joshi, Bharat Badayar; Xu, Tianli; Dawadi, Binod
通讯作者	Dawadi, B (通讯作者)
发表日期	2020
ISSN	1350-4827
EISSN	1469-8080
卷号	27 期号:5
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.
关键词	PRECIPITATION EVAPOTRANSPIRATION INDEX VEGETATION CONDITION INDEX AGRICULTURAL DROUGHT EXTREME PRECIPITATION RISK-ASSESSMENT CLIMATE TRENDS TIME SCALES RIVER-BASIN VARIABILITY CHINA
英文关键词	agriculture; drought; Nepal; precipitation; SPEI; SYRS
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000588437300001
来源期刊	METEOROLOGICAL APPLICATIONS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259972
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]. 中国科学院青藏高原研究所,2020,27(5).
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).
MLA	Hamal, Kalpana,et al."Assessment of drought impacts on crop yields across Nepal during 1987-2017".METEOROLOGICAL APPLICATIONS 27.5(2020).