旱地周年覆膜条件下冬小麦的光合特性  

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

作　　者：王勇[1] 高育锋[1] 樊廷录[1] 

机构地区：[1]甘肃省农科院旱地农业研究所,甘肃兰州730070

出　　处：《麦类作物学报》2005年第6期100-102,共3页Journal of Triticeae Crops

基　　金：国家"十五"区域持续高效农业课题(2001BA508B11);国家"863"节水专项课题(2002AA2Z4011)

摘　　要：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。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.

关 键 词：冬小麦 周年覆膜 光合速率 叶片水分利用效率 

分 类 号：S512.1[农业科学—作物学] S311