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Using meteorological data and mathematical statistics analysis, we take Jungar Banner in the northern farming-pastoral region of China for example, to analyze the fluctuations in the precipitation and average temperature in Jungar Banner during the period 1961-2009. We calculate the NPP value of agricultural ecosystem and climatic yield of the main crops in the region during the period 1961-2009, and expound the response of agricultural ecosystem productivity to climate fluctuations in Jungar Banner. Indubitably the climate changes impose great effects on the structure and function of regional ecosystem, and there is a need to take a number of measures to minimize the detrimental effects of climate changes on climatic yield of the main crops.


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