不同降雨格局对玉米幼苗生长的影响

Effects of different rainfall patterns on growth of corn seedlings

采用棚栽法和人工模拟自然降雨,比较分析不同降雨格局对玉米幼苗形态建成的影响.结果表明,(1)降雨量对玉米幼苗的形态建成表现出明显的正、负2种效应.(2)降雨量低于平均降雨量(27.8 mm)时,10 d降雨频次优于5 d,降雨量高于平均降雨量时,5 d降雨频次优于10 d.对玉米苗期地上分株而言,最佳降雨格局为降雨量38.9 mm,降雨频次5 d;对地下根系而言,最佳降雨格局为降雨量16.7 mm,降雨频次10 d.

Used shed planting method and artificial rainfall simulation, comparative analysis the effects of different rainfall patterns on morphology of corn seedling. The results showed, （ 1 ）The effects of rainfall on morphology of corn seedlings showed positive and negative two results. （ 2 ） When the rainfall was lower than the average rainfall （ 27.8 mm ） , the rainfall frequency of 10 days was better than that of 5 days, when the rainfall was higher than the average rainfall, 5 days was better than 10 days. On the aboveground ramet of corn seedlings, the best rainfall pattern was rainfall of 38.9 mm and rainfall frequency was 5 days. On the underground root system, the best rainfall pattern was 16.7 mm and rainfall frequency was 10 days.