By setting plastic mulching(PM),1 500,4 500,7 500,and 10 500 kg/hm2 of straw mulching quantiy respectively(SM15,SM45,SM75 and SM105),also setting no mulching as control treatment(CK) in winter wheat field,under simulated rainfall situation,the influence of different covering methods on soil evaporation,soil moisture and rainfall storage by soil were studied.The results indicated that the daily variations and daily cumulative of soil evaporation had the same trend in all treatments;the difference of soil eva...