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WANG Yuan-yuan, ZHANG Bo**, YIN Hai-xia
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Abstract: Based on the 1961-2010 daily weather data from 15 meteorological stations, and by using climate tendency rate, partial correlation analysis, and linear regression analysis, in combining with the inverse distance weighting (IDW) method of GIS spatial analysis techniques, this paper quantitatively analyzed the reference crop evapotranspiration (ET0) in eastern Gansu at different temporal and spatial scales, and studied the spatiotemporal variation patterns of the ET0 and related climatic affecting factors. In the recent 50 years in eastern Gansu, the mean annual ET0 presented a weak downward trend. The summer ET0 decreased significantly, being the main reason for the decrease of the mean annual ET0, the spring ET0 increased remarkably, while the ET0 in winter and autumn had no obvious change trend. The mean monthly ET0 showed a unanimous single peak. Spatially, the mean annual ET0 was larger in northern and central areas, but smaller in western areas. The spring ET0 showed an increasing trend in most areas, the summer ET0 showed a decreasing trend in the whole eastern Gansu, while the ET0 in winter and autumn had no obvious change trend. The ET0 was negatively correlated with relative humidity and precipitation, but significantly positively correlated with temperature, sunshine hours, and wind speed. Sunshine hours, wind speed, and relative humidity were the main climatic factors affecting the ET0 in eastern Gansu.
Key words: global change, soil microorganism, carbon and nitrogen cycle., field manipulative experiment
WANG Yuan-yuan, ZHANG Bo**, YIN Hai-xia. Spatiotemporal variation of reference crop evapotranspiration and related climatic affecting factors in eastern Gansu of Northwest China in 1961-2010.[J]. cje.
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URL: http://www.cje.net.cn/EN/abstract/abstract20557.shtml
http://www.cje.net.cn/EN/Y2013/V32/I6/1511