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- W2375396750 abstract "Drought is one of the costliest weather related natural hazards in North China Plain(NCP).This study was conducted to quantify the influence of drought on grain yield variability using drought indices.Detailed crop and weather data were collected from Beijing,providing a typical region of winter wheat-summer maize rotation system in NCP.The data collected from 1962to 2011provided 50years of data,which were used to compute the SPI and the SPEI drought indices at different time scales from 1to 24months.(a)The SPEI and SPI showed large differences in the evolution and identification of drought conditions during the last five decades,positive temperature anomalies were the most important cause of the aforementioned differences.(b)Drought indices more strongly correlated with yield variability during the last two decades.Regression of maize climatic yield as the dependent variable and the 3-month August SPI/SPEI as the independent variable explained up to 60.0% and 60.1% of yield variability in a curvilinear relationship,respectively.Optimum SPI/SPEI values were in the range of-0.8to 3.2and-0.9to 2.1.(c)Furthermore,winter wheat climatic yield and 24-month SPI/SPEI were a linear relationship,SPI24-5and the SPEI24-5drought indices explained 51.8%to 51.2%(P0.01)of the variation in wheat yield.These results implied that SPI and SPEI provided the accurate assessment of drought impacts on grain yield of the NCP.(d)Based on these results it would be possible to generate preliminary estimates of drought impacts on winter wheat yield by preseason with some confidence.This could be very useful in regard to providing farmers with early warning information to plan irrigation management and prepare for potential drought conditions.In conclusion,the SPI and the SPEI showed excellent capability to identify drought impacts.The impacts of drought on grain yield were much greater,yet decreased precipitation is still the key factor in yield losses.This study identified an increase in drought severity associated with higher water demand as a result of evapotranspiration.Future researches in NCP should be focused on the drought indices based on precipitation and potential evapotranspiration,as they could reflect the better role played by global warming on drought severity,and provide more accurate assessment of drought impacts on yield variability." @default.
- W2375396750 created "2016-06-24" @default.
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- W2375396750 date "2013-01-01" @default.
- W2375396750 modified "2023-09-24" @default.
- W2375396750 title "Impact of drought on grain yield in Beijing investigated by SPEI-based methods" @default.
- W2375396750 hasPublicationYear "2013" @default.
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