根系在凋落物层中的生长及其对凋落物分解的影响

凋落物分解是生态系统养分循环的重要过程, 直接影响着生态系统功能。植物根系作为重要的生物因子调控着凋落物分解过程, 然而这一重要作用却在凋落物分解的研究中长期被忽视。凋落物中下层养分充足、保水能力强, 为根系生长提供了良好环境; 同时, 生长进入凋落物层的根系通过激发效应、共生真菌、N吸收等方式对分解过程产生了重要影响。该文针对根系生长及其影响因素、根系对凋落物分解的影响及其内在机制等关键方面进行了综述, 并提出了根系生长与凋落物分解之间关系的概念模型, 以期引起大家对这个领域的关注, 并为根系与凋落物分解之间关系的研究提供良好的借鉴。

Root growth into litter layer and its impact on litter decomposition:a review

Litter decomposition is one of the most important and dynamic components of nutrient cycling in ecosystems. In addition to the well-known actions of plant roots on litter, roots also constitute an important biotic factor regulating litter decomposition. However, relatively little attention has been given to this. Relative to the upper litter layer, the middle and lower layers are enriched in water and nutrients, which provide favorable conditions for root growth. By proliferating in litter, roots potentially influence litter decomposition through a priming effect, mycorrhizal fungi and N uptake. We give an overview of root foraging in litter, including factors influencing it. We then review its influence and possible mechanisms of root growth on litter decomposition. We also propose a conceptual module that enhances understanding of the relationship between root and litter decomposition.