玉米冠层对喷灌水量的再分配

通过喷灌玉米田间试验,研究了喷灌水经玉米冠层再分配后的分布状况。结果表明:在玉米全生育期,茎秆下流水量占灌水量的均值为44%左右,棵间穿透水量占灌水量的均值为48%左右,冠层截留量在0.8￣2.9mm之间变化。一次灌水中,喷灌水在地表的分布很不均匀,43.2%的灌水量经茎秆下流到根区,在距离茎秆7cm,15cm,25cm和32.5cm处,地表接收的水量占总灌水量的比例分别为18.9%、43.5%、66.9%和84.5%。灌水量、种植密度、株高和叶面积指数等都影响着喷灌水在地表的分布。

This paper mainly studies the water distribution after corn canopy redistribution through a corn field experiment.The results show that stem flow accounts for 44% of the total irrigation amount,the water among plants comprising about 48% and the canopy interception storage verified from 0.8mm to 2.9mm during the whole growth period.The distribution of sprinkler water on surface is non-uniform: about 43.2% of the water flows to roots area through stem,and the amount to the point of 7cm,15cm,25cm and 32.5cm f...