种植行距对冬小麦田土壤蒸发与水分利用的影响

Effects of different row spaces on the soil evaporation and water use in winter wheat field

农田土壤蒸发不参与作物的生理和生产过程,属非生产性无效耗水。本研究采用Micro-lysimeters(MLS)对不同种植行距的麦田土壤蒸发测定结果表明,土壤蒸发随种植行距的增加而增大,窄行距种植的小麦冠层盖度较大,有利于抑制土壤蒸发。整个生育期7.5cm、15.0cm和30.0cm行距土壤蒸发分别为89.1mm、104.2mm和121.9mm,以15cm为对照,7.5cm行距麦田对土壤蒸发的抑制率为14.5%,而30cm行距麦田土壤蒸发增加17.0%。

Soil evaporation is useless because it doesn＇t participate in the processes of physiology and production of crops. The soil evaporation in different row spaces of winter wheat was measured by the Micro-lysimeters （MLS）. The results show that with the increase of row spaces, the soil evaporation is increased, narrow row space can reduce the soil evaporation due to the bigger plant canopy. The whole soil evaporations of winter wheat are 89. lmm, 104.2mm and 121.9mm under the row spaces of 7.5era, 15.0era and 30.0era. If taking the soil evaporation of 15era row space as CK, the soil evaporation with a row space of 7.5era reduces 14.5%, and that with a row space of 30era increases 17.0%.