甘蔗的光合生产分析

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。

Photosynthesic production analysis of sugarcane

The performance of photosynthesic production factors and their relationships in different growing stages were studied on seven sugarcane genotypes. The results showed that in early growing stage, NAR and CGR performed the same increasing tendence along with the increasing of LAI.However, LAI performed the negative effect on NAR and CGR after the great elongation stage. NAR became the main factor of photosynthesic production in this stage. The sugarcane colony showed its auto-adjustment ability to the negative effect of LAI. The great elongation stage was found to be an ideal stage for studying the photosynthesic features in sugarcane. LAI: leaf area index NAR: net assimilation rate CGR: crop growth rate