湖北省小麦新品种旗叶光合速率日变化及相关环境因素分析

本文对湖北省的三个小麦新品种和一个主要栽培品种（CK）旗叶的净光合速率和影响净光合速率的相关环境因子进行了研究。结果表明，四个品种旗叶净光合速率日变化有明显差异，但中午都有光合速率降低的现象，即“午睡”现象发生。环境因子对光合速率影响最大的是相对湿度。单株旗叶同化速率能较全面地反映不同品种旗叶同化能力大小。

Analysis for the diuarnal variation of the flag leaf net photosynthetic rate of Hubei's new wheat cultivars and connected environmental facters

Three new wheat cultivars and a leading cultivar and the differences of flag leaf net photosynthetic rate and the correlation of net photosynthetic rate with environmental facters were examined. The result shows that,the large differences existed in the diurnal variation net photosynthetic rate of four varieties. However,all of them had phenomena of phtosynthetic rate decreased at noon, which is called asHafternoon nap". In the environmental facters,the relative humidity is the main reason for the "nap". Entive flag leaves per plant assimilative rate (ELAR) could depict more comprehensively the difference in flag leaf assimilative capacity of cultivars.