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对7个甘蔗基因型不同生育阶段的光合生产因素的表现以及它们间的相互关系进行分析。结果表明:甘蔗生长的前期,光合生产表现为叶面积主导型,即随着叶面积指数的增加,作物生长率与净同化率均呈增长的趋势。进入伸长盛期后,叶面积指数表现出对干物质生产的负效应,净同化率成为这—时期光合生产的主导因子。甘蔗群体对叶面积指数的负效应表现出一定的自我调节能力。伸长盛期作为光合生产的关键时期,是研究甘蔗光合特性的理想阶段。
The performance of 7 photosynthetic production factors in different growth stages of sugarcane genotypes and their interrelationships were analyzed. The results showed that in the early stage of sugarcane growth, the photosynthetic performance was dominated by leaf area, that is, with the increase of leaf area index, the growth rate and net assimilation rate showed a trend of increase. After entering into the prolongation period, the leaf area index showed the negative effect on dry matter production, and the net assimilation rate became the dominant factor of photosynthesis during this period. The negative effects of sugarcane population on leaf area index showed some self-regulation ability. Elongation as a key period of photosynthetic production is an ideal stage for studying photosynthetic characteristics of sugarcane.