不同覆盖对夏玉米叶片光合和水分利用效率日变化的影响

在中国气象局农业气象试验基地,对留残茬和秸秆覆盖措施下夏玉米叶片光合作用和叶片水平上的水分利用效率进行了试验研究,以探索夏玉米在这两种方式下的节水抗旱高产的生理生态机制。试验结果表明:光合速率日变化差异主要表现在上午;下午虽不甚明显,但也是覆盖和残茬两个处理略高于对照,说明2种土表覆盖方式促进了该时段光合速率的提高。留残茬和覆盖能明显提高夏玉米叶片水平上的水分利用效率,尤其在下午表现更为明显,最终提高产量水平上的水分利用效率,使农田的光、温和水资源得以科学有效地利用。

Effects of Different Mulching Methods on Diurnal Variation of Leaf Photosynthesis and Water Use Efficiency for Summer Maize

The experiments of different mulching methods were conducted at the agrometeorological experimental base of Chinese Meteorology Administration. The objective was to investigate the effects of different mulching methods on the diurnal variation of photosynthetic rate and water use efficiency (WUE) for summer maize, and to investigate the physiological and ecological mechanism. The experimental results are as follow: The most notable difference of diurnal variation of photosynthesis rate was observed at the morning, The Pn of the mulch is higher than that of CK. The leaf WUE was more high than CK, especially, in afternoon. It shows that mulch improve the leaf WUE, and ultimately improve yield WUE.