氮、磷养分有效性对森林凋落物分解的影响研究进展

发布时间：2018-06-10 16:11

本文选题：凋落物分解 + N　；参考：《生态学报》2017年01期

【摘要】：通过对相关研究文献的综述结果表明,氮(N)和磷(P)是构成蛋白质和遗传物质的两种重要组成元素,限制森林生产力和其他生态系统过程,对凋落物分解产生深刻影响。大量的凋落物分解试验发现在土壤N有效性较低的温带和北方森林,凋落物分解速率常与底物初始N浓度、木质素/N比等有很好的相关关系,也受外源N输入的影响;而在土壤高度风化的热带亚热带森林生态系统中,P可能是比N更为重要的分解限制因子。然而控制试验表明,N、P添加对凋落物分解速率的影响并不一致,既有促进效应也有抑制效应。为了深入揭示N、P养分有效性对凋落物分解的调控机制,"底物的C、N化学计量学"假说、"微生物的N开采"假说以及养分平衡的理论都常被用于解释凋落物分解速率的变化。由于微生物分解者具有较为稳定的C、N、P等养分需求比例,在不同的养分供应的周围环境中会体现出不同的活性,某种最缺乏的养分可能就是分解的最重要限制因子。未来的凋落物分解研究,应延长实验时间、加强室内和野外不同条件下的N、P等养分添加控制试验,探讨驱动分解进程的微生物群落结构和酶活性的变化。
[Abstract]:The results of literature review showed that N (N) and P (P) were two important components of protein and genetic material which restricted forest productivity and other ecosystem processes and had a profound impact on litter decomposition. A large number of litter decomposition experiments showed that the decomposition rate of litter was closely related to the initial N concentration of substrate and lignin / N ratio in temperate zone and northern forest where N availability was low, and was also affected by exogenous N input. In the tropical and subtropical forest ecosystem with high soil weathering, P may be a more important decomposition limiting factor than N. However, the control experiment showed that the effects of NNP addition on litter decomposition rate were not consistent, both promoting and inhibiting effects. In order to reveal the regulation mechanism of nutrient availability on litter decomposition, the Con N chemometrics hypothesis of substrate, the N exploitation of microorganism hypothesis and nutrient balance theory are often used to explain the change of litter decomposition rate. Since microbial decomposers have relatively stable ratios of nutrient requirements such as Con Nu P, they may exhibit different activities in the surrounding environment of different nutrient supply, and the most deficient nutrient may be the most important limiting factor of decomposition. In the future studies on litter decomposition, we should extend the experiment time, strengthen the experiment of nutrient addition and control under different indoor and field conditions, and probe into the changes of microbial community structure and enzyme activity that drive the decomposition process.
【作者单位】：福建师范大学地理科学学院;福建师范大学湿润亚热带山地生态国家重点实验室培育基地;
【基金】：国家自然科学基金面上资助项目(31270584);国家自然科学基金重点资助项目(31130013)
【分类号】：S714

【相似文献】