高产栽培模式中能源甘蔗的光合能力和叶面积指数比较分析

Comparative analysis of energy sugarcane varieties for photosynthetic capacity and leaf area index in high yield cultivation model

【目的】揭示能源甘蔗光合性能及相关指标对生物产量形成的作用机理,为能源甘蔗品种选育与栽培提供参考。【方法】对广西甘蔗研究所近年来自育与引进的13个甘蔗新品种,进行小面积高生物量用作能源生产的品种比较试验。【结果】参试品种按生物量指标进行聚类分析,可分为特高、较高和高产3类,类平均生物总量分别达216699、186634、145416kg/ha。各高产类群的甘蔗叶面积指数(LAI)从7月至11月表现为先升高再降低的趋势。【结论】高产能源甘蔗LAI与生物产量之间存在较高的相关性。在高生物量栽培模式中,提高叶面积指数是提高能源甘蔗生物产量的关键。

[Objective] The present experiment was conducted to comparatively analyze the performance of energy canes in terms of biomass, and to evaluate the effects of various photosynthetic and yield parameters contributing to the biomass production. [Method] Thirteen sugarcane varieties （energy canes）, bred or introduced by Sugarcane Research Institute （GXAAS）, Nanning, Guangxi, have been comparatively analyzed for biomass indices, photosynthetic capacity and leaf area index （LAI）. Cluster analysis method was used to study the biomass indices in different varieties. [Result] Test varieties have been classified into highest （I）, high （II） and moderately high （III） biomass groups, for which the average biomass yields were 216699, 186634 and 145416 kg/ha, respectively. Further, there was no significant difference between net photosynthetic rate and yield among different sugarcane varieties. However, the biomass was found positively correlated with the LAI, which showed an increasing trend initially, and then decreased from July to November. [Conclusion] It was concluded that LAI is a key factor affecting the biomass of energy canes in high yield cultivation model.