参照作物腾发量变化规律的探讨

Discussion on crop evapotranspiration and its variability regularity

选用Penman-Monteith公式计算了三河市参照作物腾发量(ET0),分析了不同水文年降水与参照作物腾发量的变化关系,并对参照作物腾发量构成项进行了比较。结果表明:参照作物腾发量中辐射项(ETrad)的变化趋势基本反映了腾发量(ET0)的变化趋势,一年四季都处于主导地位,而空气动力学项(ETaero)全年变化较小,一般在冬季对腾发量有较大影响。

The evapotranspiration in Sanhe city was calculated with Penman-Monteith formula. The relationship between precipitation and reference evapotranspiration in various hydrological years was analyzed and the items of reference evapotranspiration were compared. It was concluded that ET_(rad) of reference evapotranspiration reflects basically the dynamic regularity of reference evapotranspiration, and ET_(rad) was dominant all the year round. ET_(aero), another item of reference evapotranspiration, varied less in the whole year, in general, it was more influential to evapotranspiration in winter than in other seasons.