Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (17): 228-235.doi: 10.11924/j.issn.1000-6850.2013-2058

Special Issue: 资源与环境 农业生态

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The Change of Potential Evapotranspiration during 1981 to 2010 and the Analysis of Ecological Water Demand

  

  • Received:2013-07-30 Revised:2013-09-23 Online:2014-06-14 Published:2014-06-14

Abstract: In order to know the amount of real-time soil moisture gains and losses of Liaoning, grasped the water demand situation and carried out artificial rainfall operations scientifically. The daily precipitation, wind speed, temperature, barometric pressure, relative humidity, the daily total sunshine, minimum temperature, maximum temperature, and other meteorological data of 55 stations from 1981 to 2012 was used. FAO PenmanMonteith model was applied to calculate potential evapotranspiration and analyze the temporal and spatial variation of potential evapotranspiration trends and characteristics of Liaoning Province. The results showed that nearly 30 years the interannual change of potential evapotranspiration was downward trend in the overall in Liaoning Province. The summer potential evapotranspiration was the most one in four seasons, in some regions there was a little difference in spring and summer or even slightly larger in spring, autumn and winter was small. The spatial distribution of the characteristic showed decreasing from west to east. The ecological water analysis system was established based on calculating potential evapotranspiration, which could calculate soil water budget for each observation point at real time. It could provide reference for decision and command of artificial rainfall.