By assuming constant winter wheat varieties and agricultural practices in China,the influence of climate change on winter wheat is simulated using the corrected future climate projections under SRES A2 and AlB scenari...By assuming constant winter wheat varieties and agricultural practices in China,the influence of climate change on winter wheat is simulated using the corrected future climate projections under SRES A2 and AlB scenarios from 2012 to 2100,respectively.The results indicate that the growth of winter wheat would be strongly influenced by climate change in future.The average flowering and maturity dates of winter wheat would advance by 26 and 27 days under scenario A2,and by 23 and 24 days respectively under scenario A1B from 2012 to 2100.The simulated potential productivity of winter wheat shows a decrease of 14.3%and 12.5%for scenarios A2 and A1B respectively without the fertilization effect of CO_2,while an increase of 1.3%and 0.6%with the fertilization effect of CO_2.Additionally,for northern China, the simulated potential productivity would markedly decrease under both scenarios,independent with the fertilization effect of CO_2,which indicates that the current planted winter wheat would be more vulnerable than that in southern China.The most likely reason is the current winter wheat varieties in northern China are winter varieties or strong winter varieties,which need some days of low temperature for dormancy.While in southern China,the winter wheat is spring or half winter varieties and can grow slowly during winter,thus,they would be affected slightly when winter temperature increases.The results of this study may have important implications for adaptation measures.展开更多
The Kirk test has good precision for measuring stray light in optical lithography and is the usual method of measuring stray light.However,Kirk did not provide a theoretical explanation to his simulation model.We atte...The Kirk test has good precision for measuring stray light in optical lithography and is the usual method of measuring stray light.However,Kirk did not provide a theoretical explanation to his simulation model.We attempt to give Kirk's model a kind of theoretical explanation and a little improvement based on the model of point spread function of scattering and the theory of statistical optics.It is indicated by simulation that the improved model fits Kirk's measurement data better.展开更多
Precipitation regimes of China were mapped by using empirical orthogonal function (EOF) analysis with orthogonal rotation based on normalized monthly mean precipitation data at 400 stations from 1961 to 2006.The regio...Precipitation regimes of China were mapped by using empirical orthogonal function (EOF) analysis with orthogonal rotation based on normalized monthly mean precipitation data at 400 stations from 1961 to 2006.The regional boundaries were defined with the maximum-loading approach.The results identified 13 consistent and contiguous precipitation regions with distinct regional variations in China that are expected to reflect dominant regional patterns focusing on seasonal and interannual precipitation variations.The precipitation regionalization is operationally useful for seasonal and interannual climate predictions.展开更多
基金supported by the impact of agrometeorology disasters on agriculture under climate change in China(No.GYHY201106021)National Basic Research Program of China(No.2012CB955301)
文摘By assuming constant winter wheat varieties and agricultural practices in China,the influence of climate change on winter wheat is simulated using the corrected future climate projections under SRES A2 and AlB scenarios from 2012 to 2100,respectively.The results indicate that the growth of winter wheat would be strongly influenced by climate change in future.The average flowering and maturity dates of winter wheat would advance by 26 and 27 days under scenario A2,and by 23 and 24 days respectively under scenario A1B from 2012 to 2100.The simulated potential productivity of winter wheat shows a decrease of 14.3%and 12.5%for scenarios A2 and A1B respectively without the fertilization effect of CO_2,while an increase of 1.3%and 0.6%with the fertilization effect of CO_2.Additionally,for northern China, the simulated potential productivity would markedly decrease under both scenarios,independent with the fertilization effect of CO_2,which indicates that the current planted winter wheat would be more vulnerable than that in southern China.The most likely reason is the current winter wheat varieties in northern China are winter varieties or strong winter varieties,which need some days of low temperature for dormancy.While in southern China,the winter wheat is spring or half winter varieties and can grow slowly during winter,thus,they would be affected slightly when winter temperature increases.The results of this study may have important implications for adaptation measures.
基金by the National Basic Research Program of China under Grant No 2007AA01Z333the National Special Program of China under Grant No 2009ZX02204-008.
文摘The Kirk test has good precision for measuring stray light in optical lithography and is the usual method of measuring stray light.However,Kirk did not provide a theoretical explanation to his simulation model.We attempt to give Kirk's model a kind of theoretical explanation and a little improvement based on the model of point spread function of scattering and the theory of statistical optics.It is indicated by simulation that the improved model fits Kirk's measurement data better.
基金jointly supported by the National Key Technologies R&D Program of China (2007BAC 29B04 and 2009BAC51B05)the China Meteorological Administration Operation Project (the Operational System Setup of Seasonal Climate Prediction)
文摘Precipitation regimes of China were mapped by using empirical orthogonal function (EOF) analysis with orthogonal rotation based on normalized monthly mean precipitation data at 400 stations from 1961 to 2006.The regional boundaries were defined with the maximum-loading approach.The results identified 13 consistent and contiguous precipitation regions with distinct regional variations in China that are expected to reflect dominant regional patterns focusing on seasonal and interannual precipitation variations.The precipitation regionalization is operationally useful for seasonal and interannual climate predictions.
基金supported by grants from The National Natural Science Foundation of China (21273279, 31170794)the special fund for the Integration of Science and Education (2015 2017), University of Chinese Academy of Sciences
