旱地周年覆膜条件下冬小麦的光合特性

在周年覆膜条件下,以陇鉴339为材料,研究了周年地膜覆盖后冬小麦的光合速率(P n)变化,以了解周年覆膜对冬小麦光合作用的影响。结果表明,周年覆膜秋播冬小麦较露地冬小麦光合速率、叶片水分利用效率显著提高。冬小麦旗叶P n日变化呈现“单峰型”,覆膜的高峰值较露地增加3.917μm olCO2.m-2.-s 1,提高17.74%,且持续时间延长,整个P n日变化中覆膜较露地平均提高11.62%。各生育阶段覆膜冬小麦的P n始终维持在较高水平上。增施氮肥、提高氮磷比有利于提高冬小麦P n。

Studies on Photosynthetic Characteristics of Winter Wheat with Plastic Film Mulching in a Whole Year in Dryland

Photosynthetic characteristics of the winter wheat were studied under plastic film mulch in a whole year(fallow and growing period).It showed that photosynthetic rate(Pn) and Instantaneous water use efficiency(WUE) of leaf of winter wheat increased in the different growing stage after film mulching;the changes of photosynthetic rate in winter wheat of a day were a single peak under both mulching and no-mulching(CK) conditions under mulching condition,the peak value and average of Pn in a day increased by 17.74% and 11.62%,respectively than in no-mulching;Pn in whole growing stage of mulching wheat was higher than it in CK.At the same time,Pn was increased with the nitrogen amount.