能源甘蔗群体光合生产特性研究──Ⅰ．能源甘蔗群体光合生产能力及其与三个株型参数关系的分析

本研究表明七个不同基因型能源甘蔗各生育阶段平均ＣＧＲ、平均ＮＡＲ在整个生育期中呈钟型曲线消长，各生育阶段平均ＬＡＩ呈″Ｓ″形曲线消长；苗期至分蘖前中期ＮＡＲ和ＬＡＩ对ＣＧＲ作用相似，分蘖中后期以ＬＡＩ对ＣＧＲ的贡献大，ＬＡＩ与ＣＧＲ显著正相关，并具较大的正直接作用和净贡献率；伸长生长期以后，在一定ＬＡＩ的基础上的ＮＡＲ对ＣＧＲ显得十分重要，伸长生长后期ＬＡＩ极显著正相关，而ＮＡＲ与ＣＧＲ均极显著正相关并具较大的正直接通径和净贡献率。研究表明，不同生育期甘蔗株型结构对群体光合生产力的作用有显著的差异。在分蘖期以前，甘蔗主要功能叶的角度指数、平均茎叶夹角与ＮＡＲ显著正偏相关，主要功能叶的叶向值与ＮＡＲ显著负相关；中后期，主要功能叶的角度指数与ＮＡＲ显著负相关，叶向值与ＣＧＲ、ＮＡＲ显著正偏相关。

Study on Colony Photosynthesis of Sugarcane for Energy Resources ──Ⅰ. The Preliminary Analysis on the Colony Photosynthetic Capacity and Its Relationship with three Morphological parameters

A study on the colony photosynthetic capicity and its relationship with morphological parameters of seven genotypes of sugarcane with highbiological yields were conducted in this paper. The results show that the avarge CGR、NAR of different genotypes develop in bell curves in the whole growthcycle, whereas, the avarge LAI of different geontypes develop in ″ s ″ curves in the whole growth cycle. NAR and LAI exhibit the similiar effect on CGR from seedling to earlier and middle tillering stage, but in the middle and later tillering stages LAI exhibit a more important effect on CGR than NAR, with corelation coefficient significantly at 1% level and high direct path, large net contribution ratio to CGR. In elongation and technical maturing stages NAR exhibit a more important role in determining CGR with corelation coefficient with CGR significant at 1% level and exhibit high direct pathsand net contribution ratio to CGR.The results also show. that morphological structure have various effect on colony photosynthetic capicity according to different growth stages, angle index (α), avarge angle between stem and main functional leaves (β) exhibits postive partial corelationship with NAR, and oriention index of main functional leaves(xl) partial corelated with NAR postively before tillering stage. But in the middle and later growth stages, α partial corelated negatively with NAR significantly, XL partial corelated postively with CGR and NAR significantly.