枯枝落叶层对森林天然更新的障碍

Barrier effect of litter layer on natural regeneration of forests:A review

探讨枯枝落叶层对树种天然更新的障碍机制,对于实现天然次生林的科学管理以及采取适当营林措施促进目的树种天然更新具有重要的理论和实践意义。从枯枝落叶层的物理阻断影响(物理因子)、枯枝落叶层的化感作用(化学因子)、动物侵害和微生物致病(生物因子)等方面,论述了枯枝落叶层对天然更新方面的障碍作用,揭示枯枝落叶层物理阻断对天然更新影响规律,以及主要林型的化感作用与天然更新关系的作用机制。建议今后应加强对不同林型枯枝落叶层的结构、枯枝落叶层下光量子流密度的变化规律以及红光与远红光比值的变化规律等方面研究。

To approach the mechanisms of the barrier effect of litter layer on the natural regeneration of forests is of theoretical and practical significance in the scientific management of secondary forests and in adopting proper methods to improve the natural regeneration of target tree species. From the aspects of physical interdiction （physical factors） , allelopathy （chemical factors） , and animal invasion and microbial infection （biological factors）, this paper discussed the barrier effect and mechanisms of litter layer on forest natural regeneration. It was suggested that further studies should be made on the structure of litter layers under different forest types, and the change patterns of photon density and red light/far-red light ratio under litter layer.