Plant diversity drives soil microbial biomass carbon in grasslands irrespective of global environmental change factors
Plant diversity drives soil microbial biomass carbon in grasslands irrespective of global environmental change factors
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DOI：
10.1111/gcb.13011
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发表时间：
2015-11
影响因子：
11.6
通讯作者：
Madhav P. Thakur;A. Milcu;P. Manning;P. Niklaus;C. Roscher;S. Power;P. Reich;S. Scheu;D. Tilman-D.-Tilm
中科院分区：
文献类型：
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作者：
Madhav P. Thakur;A. Milcu;P. Manning;P. Niklaus;C. Roscher;S. Power;P. Reich;S. Scheu;D. Tilman-D.-Tilm
土壤微生物生物量是土壤碳动态的关键决定因素。一些研究表明，土壤微生物生物量显着增加与植物物种多样性，但仍不清楚植物物种多样性是否也可以稳定土壤微生物生物量在不断变化的环境。这个问题特别重要，因为许多全球环境变化（GEC）因素，如干旱和养分富集，已被证明会减少土壤微生物生物量。植物多样性和GEC因子的正交操作实验可以提供植物多样性是否可以减弱对土壤微生物生物量的不利影响的见解。在这里，我们提出了12个不同的研究与14个独特的正交植物多样性× GEC操作在草原上，植物多样性和至少一个GEC因素（CO2浓度升高，营养富集，干旱，干旱的存在，或变暖）进行了操作的分析。我们的研究结果表明，更高的植物多样性显着提高土壤微生物生物量，在长期田间试验中效果最强。相反，GEC因素有不一致的影响，只有干旱有显着的负面影响。重要的是，我们报告了植物多样性和GEC因子之间所有14种相互作用的一致非显著影响，这表明植物多样性减弱GEC因子对土壤微生物生物量影响的潜力有限。我们强调，植物多样性是一个主要的决定因素，土壤微生物生物量的实验草地，可以影响土壤碳动态，无论GEC。
Soil microbial biomass is a key determinant of carbon dynamics in the soil. Several studies have shown that soil microbial biomass significantly increases with plant species diversity, but it remains unclear whether plant species diversity can also stabilize soil microbial biomass in a changing environment. This question is particularly relevant as many global environmental change (GEC) factors, such as drought and nutrient enrichment, have been shown to reduce soil microbial biomass. Experiments with orthogonal manipulations of plant diversity and GEC factors can provide insights whether plant diversity can attenuate such detrimental effects on soil microbial biomass. Here, we present the analysis of 12 different studies with 14 unique orthogonal plant diversity × GEC manipulations in grasslands, where plant diversity and at least one GEC factor (elevated CO2, nutrient enrichment, drought, earthworm presence, or warming) were manipulated. Our results show that higher plant diversity significantly enhances soil microbial biomass with the strongest effects in long‐term field experiments. In contrast, GEC factors had inconsistent effects with only drought having a significant negative effect. Importantly, we report consistent non‐significant effects for all 14 interactions between plant diversity and GEC factors, which indicates a limited potential of plant diversity to attenuate the effects of GEC factors on soil microbial biomass. We highlight that plant diversity is a major determinant of soil microbial biomass in experimental grasslands that can influence soil carbon dynamics irrespective of GEC.