Relationships Between Soil Microorganisms, Plant Communities, and Soil Characteristics in Chinese Subtropical Forests
Relationships Between Soil Microorganisms, Plant Communities, and Soil Characteristics in Chinese Subtropical Forests
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DOI：
10.1007/s10021-012-9533-3
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发表时间：
2012-04
期刊：
影响因子：
3.7
通讯作者：
Yu Ting Wu;J. Gutknecht;K. Nadrowski;C. Geißler;P. Kühn;T. Scholten;S. Both;Alexandra Erfmeier;Martin Böhnke;H. Bruelheide;T. Wubet;F. Buscot
中科院分区：
文献类型：
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作者：
Yu Ting Wu;J. Gutknecht;K. Nadrowski;C. Geißler;P. Kühn;T. Scholten;S. Both;Alexandra Erfmeier;Martin Böhnke;H. Bruelheide;T. Wubet;F. Buscot
我们分析了地上和地下因素对中国亚热带森林土壤微生物群落的影响，这是北方半球最具多样性的生物群落之一。在三个林龄级（幼龄10-40年，中龄40-80年，树龄≥80年）的四个重复比较研究样地的不同深度采集土壤样品。微生物生物量和群落结构，然后确定使用磷脂脂肪酸（PLFA）分析，和基础呼吸和微生物生物量碳（CMIC）测定底物诱导呼吸。然后，这些数据与植物群落和土壤变量使用非度量多维尺度分析和事后置换相关性。我们发现，微生物脂质组成和丰度与林龄级无关。相反，微生物脂质组成和丰度与反映初级生产的因素有关，即，枯落物覆盖率、枯木覆盖率和乔木层覆盖率。具体而言，相对丰度（摩尔分数）的指标丛枝菌根真菌，革兰氏阳性菌和革兰氏阴性菌的百分比凋落物覆盖呈正相关。我们还发现，所有微生物类群的生物量和PLFA总量与枯枝落叶率呈负显着相关。此外，是唯一的土壤参数，是相关的微生物生物量显着。我们的研究结果表明，总体生态因素，如植物生产力和土壤pH值是影响土壤微生物群落的重要因素，无论是在生物量和社区组成在这个亚热带生态系统。
We analyzed the influence of above- and belowground factors on the soil microbial community in a Chinese subtropical forest, one of the most diverse biomes in the northern hemisphere. Soil samples were taken at different depths from four replicate comparative study plots in each of three forest age classes (young 10–40 years, medium 40–80 years, old ≥80 years). Microbial biomass and community structure were then determined using phospholipid fatty acid (PLFA) analysis, and basal respiration and microbial biomass carbon (Cmic) were determined by substrate-induced respiration. These data were then related to plant community and soil variables using non-metric multidimensional scaling analysis and post-hoc permutational correlations. We found that microbial lipid composition and abundance were not related to forest age class. Instead, microbial lipid composition and abundance were related to factors reflecting primary production, i.e., percent litter cover, percent dead wood cover, and percent tree layer cover. Specifically, the relative abundance (mol fraction) of indicators for arbuscular mycorrhizal fungi, Gram-positive and Gram-negative bacteria were positively significantly correlated with percent litter cover. We also found that the biomass of all microbial groups and total PLFA were negatively significantly related to percent deadwood cover. In addition,was the only soil parameter that was correlated significantly to microbial biomass. Our results indicate that overarching ecological factors such as plant productivity and soil pH are important factors influencing the soil microbial community, both in terms of biomass and of community composition in this subtropical ecosystem.