华北平原冬小麦田问蒸散与棵问蒸发的变化规律研究

The changing laws of the diurnal evapo transpiration and soil evaporation between plan ts in the winter wheat field of the North China Plain

摘要: 试验研究冬小麦田间蒸散和棵间蒸发变化规律及其影响因子结果表明，播种～返青期冬小麦棵间蒸发占蒸散比例(E／ET)最大，抽穗～灌浆期最小。整个生长期间棵间蒸发占蒸散量31．4％，棵间蒸发占蒸散比例(E／ET)与冬小麦叶面积指数(LAI )有一定关系，E／ET=0．3693×(LAI)^-0.7493(R² =0．8236)。

Abstract: The changing laws and affecting factors 0f the diurnal evapotranspiration and aoil evaporation between plants in the winter wheat field are studied in this paper．The results show that the ratio Of evapo ration tO evapotranspiration is the most from seeding tO recovering an d it is the least from tasseling to grain·-filling；the ratio of evapo ration tO evapotranspiration in the winter wheat field is about 31．4％ during the whole periods；the equation of the relationship between the rati0 of evaporation to evapotranspiration(E／ET)and LAJ is E／ET=0．3693×(LAI)^-0.7493(R² =0．8236)．