高产麦田群体结构与光合作用的关系

研究表明，高产麦田小麦单株分蘖数与单株、单蘖的光合速率呈正相关；单位上地面积上的群体分蘖数与单蘖光合速率呈负相关；基本苗少的处理单位叶面积指数的光合速率高于基本苗多的处理；拔节前群体分楼群体分蘖数与群体光合速率呈正相关，开花后呈负相关。适当减少基本苗，控制群体分蘖，依靠增加单株分蘖数实现合理群体指标，可有效地提高个体光合能力，增强开花后的群体光合能力，从而获得高产。

RELATIONSHIP BETWEEN COMMUNITY STRUCTURE AND PHOTOSYNTHESIS IN HIGH-YIELD WINTER WHEAT

Results showed that the number of single-plant tillers was positively correlated with photosynthesis rate of a single-plant and a single-tiller; the number of community tillers per unit field area negatively correlated with photosynthesis rate of a single-tiller, photosynthesis rate of per unit leaf area index (LAI) at lower density was higher than that at higher density; the number of plant community positively correlated with canopy photosynthesis rate before jointing, but negatively after an thesis. Decreasing in plant population density, controlling community tillers and increasing the number of single-plant tillers could increase the photosynthetic ability of community and individuals thus get higher yields.