增温和施氮条件下AM真菌对松嫩草地植物和土壤C、N、P化学计量特征的影响

项目名称： 增温和施氮条件下AM真菌对松嫩草地植物和土壤C、N、P化学计量特征的影响

项目编号： No.31470405

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 生物科学

项目作者： 郭继勋

作者单位： 东北师范大学

项目金额： 86万元

中文摘要： AM真菌是土壤微生物区系中最重要的组成部分之一，在促进植物养分吸收、缓解气候变化对陆地生态系统的不利影响、影响生态系统C、N、P的循环具有重要的意义。尽管如此，AM真菌的生长发育也受到气候变化的影响。截至目前，对于气候变化条件下AM真菌对地上和地下生态系统C、N、P化学计量特征的影响机制并不清楚。探明气候变化背景下AM真菌对生态系统C、N、P化学计量特征的影响机制已经成为菌根生态学、化学计量生态学和全球变化生态学关注的热点和前沿问题。本项目以松嫩草地为研究对象，在自然条件下，采用模拟温度升高和氮沉降的控制实验，研究增温和施氮条件下AM真菌对松嫩草地土壤、土壤微生物、枯落物和植物C、N、P化学计量特征变化的影响，探明气候变化背景下AM真菌对草地生态系统C、N、P的周转和分配的调节作用。研究结果为解释和评价气候变化背景下AM真菌对草地生态系统C、N、P循环的调节机理和作用潜力提供理论。

中文关键词： 全球变化；AM真菌；草地生态系统；生态化学计量学

英文摘要： Arbuscular mycorrhizal (AM) fungi (Phylum Glomeromycota) are the most in?uential members of the soil microbiota, which play a key role in plant nutrition uptake, reducing the negative effects of global change on terrestiral ecosystem and influencing carbon (C), nitrogen (N) and phosphorus (P) cycles. However, the development of AM fungi is influenced by global change.Up to now, the influence mechanism that AM fungi alter the C: N:P stoichiometry aboveground and belowground ecosystem is not still clear. How to make clear the mechanism that AM fungi influence ecosystem C: N: P stoichiometry has been become a key issue to mycorrhizae ecology, stoichiometry ecology and global change ecology. In this project, we study the influence of AM fungi on C: N: P stoichiometry of soil, soil microbe, litter and dominant plant species under warming and N addition condition in Songnen meadow steppe northeastern China, and make clear the regulation of AM fungi on the turnover and allocation of C, N and P in grassland ecosystem in the context of global change. The results will help us to elucidate the regulation mechanism that AM fungi influence grassland ecosystem C cycling, N cycling and P cycling under global change condition, and evaluate the potential of AM fungi on ecosystem C cycling, N cycling and P cycling in future.

英文关键词： Global change;AM fungi;Grassland ecosystem;Ecostoichmetry