Temporal and spatial variation characteristics of precipitation during crop growing season in Northeast China | 东北地区主要作物生长季降水量的时空变化特征研究
2010
Li Xiufen, Heilongjiang Province Institute of Meteorological Sciences，Harbin（China） | Li Shuai, Heilongjiang Province Institute of Meteorological Sciences，Harbin（China） | Ji Ruipeng, Institute of Atmospheric Environment , Shengyang（China）
[Objective] The aims were to understand variation characteristics of water resources and provide theoretical guidance for the formulation of agricultural irrigation methods. [Method] Taking the precipitation records during crop growing season (from April to September) observed by 177 weather stations from 1971 to 2008 in the three provinces of Northeast China (Heilongjiang, Jilin and Liaoning) as research data, annual change and spatial distribution characteristics of precipitation during crop growing season were analyzed by means of small grid interpolation and climatic trend rate. [Result] The precipitation during crop growing season general exhibited the decreasing trend and the precipitation trend rate was -8.6 mm/10a in Northeast China. In addition, there was lack of rain from 1971 to 1980 and relatively abundant of rain during 1981 and 1990 respectively. Moreover, the precipitation obviously exhibited decreasing trend from 1991 to 2008. But the decreasing trend was inconsistent in spatial distributions, that was, the precipitation slightly increased in relatively rainless areas and obviously decreased in relatively rainy areas. [Conclusion] The areas with obvious decreasing trend of precipitation during crop growing season are the main grain producing zones in Northeast China, so the problem of food production security caused by the precipitation changes should be paid enough attention.
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