共生期土壤水分对麦棉套种冬小麦比叶重、WUE和产量的影响

在麦棉套种的条件下,研究了共生期土壤水分对冬小麦旗叶比叶重(LSW)、水分利用效率(WUE)和产量的影响,并对旗叶干物质衰减速率(DM DR)、叶绿素含量和旗叶的籽粒贡献率做了测定.试验结果表明,共生期土壤水分条件明显影响了比叶重的下降速度,土壤水分高时比叶重的下降速度较小.不同土壤水分条件的旗叶水分利用效率(LWUE)在共生期均经历了先上升后下降,接近成熟期又上升3个阶段.在共生后期,土壤含水量高的冬小麦具有较高的比叶重和叶绿素含量,但其产量和产量水平水分利用效率(YWUE)则显著下降(P<0.01).

Effects of Soil Moisture during the Co-growing Period on Leaf Specific Weight,WUE and Yield of Winter Wheat in Cotton and Wheat Inter-cropping

In wheat and cotton inter-cropping the effects of soil moisture during the co-growing period on flagleaf specific weight,WUE and yield of winter wheat was examined and the dry matter declining rate,chlorophyll content and contribution rate of the flagleaves to the grains were determined.The results showed that the soil moisture during the co-growing period remarkably affected the decreasing rate of the leaf specific weight and the leaf specific weight decreased at a low rate where the soil moisture was high.During the co-growing period,the WUE first increased,then declined and later on rose near the maturity.During the late co-growing period,the leaf specific weight and chlorophyll content of winter wheat were high where the soil moisture was high,but the yield and WUE by yield significantly declined(P<0.01).