Soil and tree species traits both shape soil microbial communities during early growth of Chinese subtropical forests
Soil and tree species traits both shape soil microbial communities during early growth of Chinese subtropical forests
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DOI：
10.1016/j.soilbio.2016.02.004
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发表时间：
2016-05
影响因子：
9.7
通讯作者：
Z. Pei;D. Eichenberg;H. Bruelheide;W. Kröber;P. Kühn;Ying Li;G. Oheimb;O. Purschke;T. Scholten-T.-Sch
中科院分区：
文献类型：
--
作者：
Z. Pei;D. Eichenberg;H. Bruelheide;W. Kröber;P. Kühn;Ying Li;G. Oheimb;O. Purschke;T. Scholten-T.-Sch
需要更好地了解地上和地下生物群落之间的联系，以便更准确地预测气候变化、土地管理或生物多样性丧失可能如何改变生态系统。土壤微生物受多种因素的影响，包括当地的非生物环境条件和植物特性。为了找出土壤微生物群落如何对当地土壤和植物环境的多个方面做出反应，我们分析了29个树种的3年生单一栽培的土壤脂类分布。这些种原产于中国东南部多样的亚热带森林，在功能特征、生长或生物量特征以及系统发育关系上有很大的差异。除了每个树种的特征外，我们还确定了每个单一栽培地块的土壤和地块特征，并测试了树种特定微生物指示物中的系统发育信号。微生物群落结构和生物量同时受土壤性质和植物功能性状的影响，但与树种间的系统发育距离无关。具体而言，微生物总生物量、真菌、细菌和放线菌指标与土壤pH、土壤有机氮和土壤水分呈正相关。我们的结果还表明，叶片干物质含量和叶片碳氮比影响土壤微生物群落的多变量结构，并且这些因素和树木生长性状(树高、树冠或地径)正向促进特定微生物功能群的丰富。同时，叶片含氮量与革兰氏阳性细菌丰度呈负相关，表明植物-微生物对氮素的竞争。总而言之，即使在树木生长的早期阶段，土壤微生物群落的丰富度和结构也会受到植物特性和当地土壤特性的显著影响。
A better understanding of the linkages between aboveground and belowground biotic communities is needed for more accurate predictions about how ecosystems may be altered by climate change, land management, or biodiversity loss. Soil microbes are strongly affected by multiple factors including local abiotic environmental conditions and plant characteristics. To find out how soil microbial communities respond to multiple facets of the local soil and plant environment, we analysed soil lipid profiles associated with three-year-old monocultures of 29 tree species. These species are native of the diverse subtropical forests of southeast China and greatly vary in functional traits, growth or biomass characteristics, and phylogenetic relatedness. Along with the traits of each tree species, we also determined the soil and plot characteristics in each monoculture plot and tested for phylogenetic signals in tree species-specific microbial indicators. Microbial community structure and biomass were influenced by both soil properties and plant functional traits, but were not related to the phylogenetic distances of tree species. Specifically, total microbial biomass, indicators for fungi, bacteria, and actinomycetes were positively correlated with soil pH, soil organic nitrogen, and soil moisture. Our results also indicate that leaf dry matter content and the leaf carbon to nitrogen ratio influence multivariate soil microbial community structure, and that these factors and tree growth traits (height, crown or basal diameter) positively promote the abundances of specific microbial functional groups. At the same time, a negative correlation between leaf nitrogen content and Gram positive bacterial abundance was detected, indicating plant–microbial competition for nitrogen in our system. In conclusion, even at early stages of tree growth, soil microbial community abundance and structure can be significantly influenced by plant traits, in combination with local soil characteristics.