作物间套作群体光能截获和利用机理研究进展

合理的间套作种植模式具有高产高效及环境友好的特点,可能成为未来可持续农业的重要组成部分.光能的高效利用是间套作群体产量占优的主要原因之一.论文综述了计算间套作群体光能截获及分配的半经验模型及理论模型,分析了间套作群体产量优势形成的生理生态基础.间作套种可形成有利于作物吸收光能的冠层结构,或者可促进作物的光合速率,或者可改变作物的收获指数.对于共生期较长的间套作群体而言,优势作物对光能的高效截获和劣势作物对光能的高效利用是群体产量优势形成的主要原因,而对于共生期较短的间套作群体而言,两种作物光能吸收量的增加是该群体高产的主要驱动力.

A Review of Light Interception and Utilization by Intercropped Canopies

Intercropping has the characteristics of being high efficient and environmental friendly. It might be an important part of the sustainable agriculture in the future. The present study reviewed the semi-empirical and theoretical models for estimating light interception of intercropped canopies, and then analyzed the mechanisms responsible for high yield of intercrops from the perspective of light utilization. Intercropping could increase light interception, or promote the efficiency of converting captured light, or change the harvest index of crop. For the intercrops with relative long co-growth period, yield advantage is mainly attained from the efficient light capture by the dominant crop and the efficient light use by the subordinate crop, while for the intercropping systems with shorter co-growth period, the increase of light interception by both crops is the primary drive force for the intercropping benefit.