Relationship between plant species diversity and soil microbial functional diversity along a longitudinal gradient in temperate grasslands of Hulunbeir, Inner Mongolia, China
Relationship between plant species diversity and soil microbial functional diversity along a longitudinal gradient in temperate grasslands of Hulunbeir, Inner Mongolia, China
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DOI：
10.1007/s11284-007-0405-9
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发表时间：
2008-05-01
影响因子：
2
通讯作者：
Zheng, Xiaoxuan
中科院分区：
文献类型：
--
作者：
Liu, Zhanfeng;Liu, Guohua;Zheng, Xiaoxuan
许多实验已经建立了研究植物多样性对土壤微生物群落的影响。然而，植物多样性和微生物功能多样性之间的关系，沿着广泛的空间梯度在大尺度上还没有探索。以内蒙古呼伦贝尔温带草原为研究对象，研究了土壤微生物生物量C、微生物分解代谢活性、分解代谢多样性和分解代谢丰富度沿着纵向梯度的植物物种多样性与土壤微生物生物量C的关系。初步的去趋势对应分析（DCA）表明，植物组成显示出显着的分离沿着轴1，轴1解释了数据集中的变异的主要部分。DCA轴1与土壤微生物生物量C显著相关（r = 0.735，P = 0.001），微生物分解代谢活性（平均孔显色; r = 0.775，P < 0.001）和微生物功能多样性（分解代谢多样性：r = 0.791，P < 0.001;分解代谢丰富度：r = 0.812，P < 0.001），说明植物组成与土壤微生物群落沿着空间梯度在大尺度上存在一定的相关性。土壤微生物生物量C、微生物分解代谢活性、分解代谢多样性和分解代谢丰富度随植物物种丰富度的增加呈显著线性增加。然而，我们观察到的许多反应可以解释为更大的地上植物生物量与更高水平的植物多样性，这表明植物多样性影响土壤微生物群落主要是通过增加植物产量。
Numerous experiments have been established to examine the effect of plant diversity on the soil microbial community. However, the relationship between plant diversity and microbial functional diversity along broad spatial gradients at a large scale is still unexplored. In this paper, we examined the relationship of plant species diversity with soil microbial biomass C, microbial catabolic activity, catabolic diversity and catabolic richness along a longitudinal gradient in temperate grasslands of Hulunbeir, Inner Mongolia, China. Preliminary detrended correspondence analysis (DCA) indicated that plant composition showed a significant separation along the axis 1, and axis 1 explained the main portion of variability in the data set. Moreover, DCA-axis 1 was significantly correlated with soil microbial biomass C (r = 0.735, P = 0.001), microbial catabolic activity (average well color development; r = 0.775, P < 0.001) and microbial functional diversity (catabolic diversity: r = 0.791, P < 0.001 and catabolic richness: r = 0.812, P < 0.001), which suggested thatsome relationship existed between plant composition and the soil microbial community along the spatial gradient at a large scale. Soil microbial biomass C, microbial catabolic activity, catabolic diversity and catabolic richness showed a significant, linear increase with greater plant species richness. However, many responses that we observed could be explained by greater aboveground plant biomass associated with higher levels of plant diversity, which suggested that plant diversity impacted the soil microbial community mainly through increases in plant production.