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研究了两个品种不同叶位的光合能力。冬前叶的光合能力低于春生叶,春生叶以倒二叶的光合强度最高。旗叶的光合能力只是在灌浆期后才高于倒二叶。基本苗4～8万/亩的群体光合强度至越冬期能赶上或超过基本苗多的(16万/亩)对照处理,单株光合强度始終高于基本苗多的处理;单蘖的光合强度开始低于对照,至越冬期高于对照。春季控制分蘖数在40～60万/亩,可有利于单茎和群体光合能力的提高。盆栽群体条件下的光补偿点和光飽和点都高于单叶:光补偿点在3000～5000Lux,光飽和点則随每盆植株密度的增加而增加。控制春季分蘖,改善了群体內光照条件,促进了单茎健壯生长,在小麦生产中有利于粒多、粒重的提高。
The photosynthetic ability of different leaf positions of two cultivars was studied. The photosynthetic capacity of pre-winter leaves was lower than that of spring leaves, and the photosynthetic intensity of the second leaves of spring leaves was the highest. Flag leaf photosynthetic capacity is only higher than the second leaf after filling stage. The basic photosynthesis intensity of 4 ~ 80,000 / mu groups can catch up with or exceed the basic seedling (160,000 / mu) overwintering, and the photosynthetic intensity per plant is always higher than that of the basic ones. The photosynthesis of single tillers The intensity began to be lower than that of the control until winter was higher than that of the control. Spring tillering control in the 40 to 600000 / mu, can be conducive to single stems and groups to improve photosynthetic capacity. The light compensation point and light saturation point under potting condition were all higher than those of single leaf: the light compensation point was between 3000 and 5000 Lux, and the light saturation point increased with the plant density of each pot. Control of tillering in spring improved the light conditions in the population and promoted the robust growth of single stem, which was benefit to the increase of grain weight and grain weight in wheat production.