高产冬小麦群体光合能力与产量关系的研究

研究了高产麦田群体光合速率变化及其与产量之间的关系。结果表明:小麦群体光合速率在整个生育期内的变化呈单峰型曲线,开花前后达最大值。大播量、大群体前期群体光合上升快,高峰期进入早,后期下降迅速;小播量,小群体则有利于后期群体光合能力的提高和保持。群体光合速率受单茎的发育状况、叶面积指数及光能截获率的综合影响

Studies on the Relationship between Canopy Apparent Photosynthesis and Grain Yield in High-yielding Winter Wheat

Two winter wheat cultivars were planted in five densities in a well-cultured field forhigh yield to study the relationship between canopy apparent photosynthesis(CAP)rate and grain yield.The results indicated that the CAP rate of winter wheat duringthe entire growth period generally varied according to a single-peak curve,where thepeak value was usually reached arround the time of anthesis.However,there wereminor differences between the different density treatments.The CAP rates of populationswith higher densities usually increased more rapidly before anthesis than those withlower densities,reached the peak values earlier,and then decreased more shapply,indicating that lower density was favorable for the maintenance of the CAP capacityin the later growth period.It was also found that CAP rate was influenced collectively by the states of growthand development of the tillers,LAI and light interception.The CAP rate at the fil-ling stage was highly significantly correlated with grain yield (r=0.7843~(**))and1000-kernel weight(r=0.9962~(**)).Therefore,the enhancement of the CAP rate or theprolongation of the CAP duration during the filling stage could lead to increase ingrain yield.