| The relation of precipitation in summer unoccupied with the output of winter wheat and its space-time distribution characteristic in east Gansu |
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| DOI：10.7606/j.issn.1000-7601.2006.06.28 |
| Key Words: east of Gansu Winter wheat Precipitation in summer unoccupied output space-time distribution |
| Author Name | Affiliation | | HUANG Bin | Institute of Arid Meteorology CMA Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Lanzhou 730020,China；Qingyang City Meteorological Bureau, Xifeng 745000,China | | FEI Xiao-ling | Lanzhou Center Meteorological Observatory,Lanzhou 730020,China | | ZHANG Hong-fen | Qingyang City Meteorological Bureau, Xifeng 745000,China | | WANG Wei-tai | Qingyang City Meteorological Bureau, Xifeng 745000,China | | ZHANG Tian-feng | Qingyang City Meteorological Bureau, Xifeng 745000,China |
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| Abstract: |
| Based on the example data of Xifeng during July to September from 1971 to 2004,the correlation of precipitation in summer unoccupied with the winter wheat output of next year was obtained.And then the characteristic of space-time distribution was discussed using the precipitation data from July to September of 1971～2004 of 15 weather stations in the east of Gansu.The results showed that the correlation of the precipitation from July to September and the meteorological output of the winter wheat of next year exceeded 0.01 letter degrees and reached the prominent level;The annual precipitation changed obviously between years,the minimum precipitation appeared in 1991,was 130.2 mm,while the maximum appeared in 2003,was 464.8 mm,which was 3.6 times large as that of minimum;there was an obvious planting-year-cycle with seven years and a year-cycle with thirteen years;The precipitation changed obviously in different cycles;the precipitation in 1970s' and 1980s' was normal or slightly much,while it was generally slightly little or very little in the 1990s',it's average distance value was negative;since 2001 the precipitation has been obviously too much.The maximum value center of the total precipitation was in Zhengning,and then reduced gradually in 2 directions to the west and to the northwest,Huating was the second large precipitation area,and such distribution characteristic is closely related to geography and topographical condition in the east of Gansu. |
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