不同行距对冬小麦麦田蒸发、蒸散和产量的影响

Effects of different row spacings on soil evaporation, evapo transpiration and yield of winter wheat

为了研究不同行距对冬小麦田棵间蒸发、蒸散和产量的影响，于2002-2003年在中国科学院栾城农业生态实验站进行了试验。结果表明：不同行距处理对棵间蒸发的影响在不同的冬小麦生育时期表现不同，在4月份呈现显著性差异，在12月-3月之间，处理之间没有明显差异。在其它时期7．5cm的行距处理与30cm行距的处理呈显著性差异，15cm的处理与它们均没有明显的差异；在整个生育期内，7．5cm的行距处理比15cm和30cm的行距处理分别减少棵问蒸发13．26和29．04mm，蒸散量减少22．76mm和51．88mm；7．5cm的行距处理比15cm和30cm的行距处理分别提高产量水分利用效率0．11kg／m^3和0．23kg／m^3。

In order to study the effects of different row spacings on soil evaporation, evapotranspiration （ET） and grain yield of winter wheat, a field experiment was conducted on Luancheng Agro-eeology Station of Chinese Academy of Sciences between 2002 and 2003. The results showed soil evaporation and ET increased when row spacing became wider and WUE decreased. The significant effects of row spacings on soil evaporation occurred in April at p=0.05, the effects were not differenet from December to March and 7.5 em row spacing and 30 em row spacing showed difference at other growing stages. Soil evaporations measured under 7. 5 cm row spacing decreased 13.26 mm and 29.04 mm, ET decreased 22.76 mm and 512 88 mm, and Water Use Efficiency （WUE） increased 0. 11 kg/m^3 and 0.23 kg/m^3 than that of 15 em and 30 em row spacing, respectively.