柞蚕林冠层结构,林内光照分布与叶生物量研究

柞蚕林是以养蚕为目的的萌生栎林,林冠经剪伐而形成不同的冠型结构。本文对3种冠型的叶面积系数,冠层内叶量分布及消光系数等冠层结构特点进行了测定。结果表明,不同冠形的冠层结构特点明显影响林内光照环境及叶生物量。现有的3种冠型中,“阶梯”型结构有较高的叶面积系数和较合理的叶量分布,因而具有较高的叶生物量。“中干”型叶生物量与无干型虽无明显差异,但“中干”型消光系数较低,林内空间较大,林内光照环境比“无干”型结构优越。

Canopy structure, light distribution and leaf biomass of tussah-feeding oak forest.

Tussah-feeding oak forest is a unique coppiced forest ecosystem. In a long period of management, different canopy forms are artificially established. There practically exist three types of canopy forms. Comparative studies are conducted in canopy structure, light distribution within crown and leaf biomass for three oak species. The results show that among the three types of canopy forms, form A (the "Stair" form) has the advantages in higher leaf area index, more reasonable of leaf distribution pattern and the highest leaf biomass. The other two types have no significant difference in leaf biomass. But form B (the "Tree" form) is better than form C ("Shrub" form) for its larger crown, lower coefficent, of light extinction and better light environment within crown.