地膜覆盖对半干旱区春小麦光合作用及产量的影响

Effects of plastic film mulching on the photosynthesis and yield of spring wheat in the semi-arid region

对半干旱区春小麦进行短期地膜覆盖试验 ,结果表明 :覆膜有利于春小麦光合作用和产量水平的提高 ,但覆膜时间过长 ,日光合积累和最终籽粒产量反而有下降的趋势 .在研究区 ,春小麦最佳覆膜时间为播种至三叶期 。

A field trial of plastic film mulching on dry land spring wheat was conducted in the semi arid region of Loess Plateau. The results show that the mulched planting can improve the photosynthesis and yield of spring wheat effectively,but the diurnal net photosynthesis and grain yield has a tendency to decline with the length of mulching time. In the semi arid region,the best mulching period of spring wheat is from sowing to the three leaf stage.