| Climate change character of precipitation during the half year of summer and its impact on crop yield in the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2008.01.28 |
| Key Words: Loess Plateau half-year of summer precipitation space-time distribution grain yield |
| Author Name | Affiliation | | WANG Weitai | Key L aboratory of A rid Climate Change and Reducing Disaster?Institute of A rid Meteorology?CMA ?L anzhou， Gansu 730020，China；Qingyang Municipal Meteorology Bureau?Xifeng,Gansu 745000,China | | ZHANG Tianfeng | Qingyang Municipal Meteorology Bureau?Xifeng,Gansu 745000,China | | YAO Yubi | Dingxi Municipal Meteorology Bureau?Dingxi,Gansu 743000,China | | WANG Runyuan | Key L aboratory of A rid Climate Change and Reducing Disaster?Institute of A rid Meteorology?CMA ?L anzhou， Gansu 730020，China | | GUO Jiangyong | Key L aboratory of A rid Climate Change and Reducing Disaster?Institute of A rid Meteorology?CMA ?L anzhou， Gansu 730020，China；Qingyang Municipal Meteorology Bureau?Xifeng,Gansu 745000,China | | HUANG Bin | Qingyang Municipal Meteorology Bureau?Xifeng,Gansu 745000,China |
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| Abstract: |
| It makes use of 56 stations’ precipitation gross data in the half-year of summer from April to October in the loess plateau,analyzing their basal space distributing character and average gross precipitation with the EOF and REOF methods,and analyzing the time change character with variance analysis method.The effect of precipitation on the yield of winter wheat and maize in less and more rainfall years was also analyzed.The result showed that the precipitation during the half-year of summer had distinct difference from south to north and from east to west,and it might be divided into six regions.In different regions, the precipitation changed distinctly every year.The year of rain shortage and the year of rain abundance alternately appeared about time distribution,and the precipitation gross took on reducing trend from 1986.Contrast analysis showed that winter wheat yield increased by 420～720 kg/hm2 if the there was plenty rainfall in July to October last year and April to June the same year,while the yield reduced by 180～660 kg/hm2 if the rainfall was too little.Plenty rainfall made the yield of maize increase by 435 kg/hm2,while too little rainfall made it reduce by 435 kg/hm2 in April to September in the same year. |
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