Effects of forest biodiversity on microbial growth and activity in specific microsites and across the landscape

土壤微生物作为生物多样性和代谢潜力的巨大动态库，影响着养分循环和生态系统功能。在for981项目的第一阶段，采用磷脂脂肪酸（PLFA）谱分析方法，分析了华南亚热带森林12个参考样地土壤微生物主要类群的生物量。除了PLFA和土壤呼吸，酶活性和潜在硝化作用，将在三个方面进行分析：1)通过考虑所有27个csp，预计将进一步确定森林生物量和树种组成是否是土壤微生物总量及其在不同功能群之间再分配的主要驱动因素；2)在主试验中，我们预计在实施初始干扰后，模拟物种灭绝情景的树木多样性将对土壤微生物群落产生影响（这也将与土壤侵蚀有关）；3)通过参与新的凋落物分解实验，我们期望提供分解动力学、凋落物多样性和微生物生物量、结构和活动之间的联系。

As a huge dynamic reservoir of biodiversity and metabolic potentials, soil microorganisms shape nutrient cycling and ecosystem functions. Within the first stage of FOR 981, analyzed biomass of major groups of soil microorganisms by phospholipid fatty acid (PLFA) profiling in 12 comparative study plots (CSPs) of a reference megadiverse subtrotical forest in South China. In addition to PLFA and, soil respiration, enzyme activities, and potential nitrification, will be analysed in three areas: 1) By considering all 27 CSPs it is expected to further determine whether forest biomass and tree species composition are the main drivers of total soil microbial biomass and its repartition between different functional groups; 2) In the main experiment, we expect that after the initial disturbance of implementation, tree diversity, planted to mimic species extinction scenarios, will have an impact on the soil microbial community (which will also be related to soil erosion); and 3) By participating in the new litter decomposition experiment, we expect to provide links between decomposition dynamics, litter diversity, and microbial biomass, structure, and activity.