Differential responses of soil bacteria and fungi to altered precipitation in a meadow steppe
Differential responses of soil bacteria and fungi to altered precipitation in a meadow steppe
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草甸草原土壤细菌和真菌对降水变化的不同反应
DOI：
10.1016/j.geoderma.2020.114812
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发表时间：
2021-02
期刊：
影响因子：
6.1
通讯作者：
Sun Wei
中科院分区：
文献类型：
--
作者：
Yang Xuechen;Zhu Kai;Loik Michael E.;Sun Wei
土壤微生物是生态系统过程的重要参与者，其组成、多样性和功能受到降水变化的影响。降水变化对土壤细菌和真菌群落影响的模式和关键过程尚不清楚。为了更好地了解降水变化对土壤微生物的影响，我们在中国东北的草甸草原上进行了为期3年的野外降水操纵试验，处理范围从降水减少50%到增加50%。结果表明，与真菌群落相比，细菌群落对降水变化更为敏感。真菌群落对降水年际差异敏感，但对处理引起的降水变化不敏感。年降水量的增加使微生物群落的优势从细菌转向真菌。在200 ~ 280 mm的降水范围内，土壤微生物生物量和多样性最大，低于长期平均年降水量（430 mm）。土壤含水量、pH和全磷是影响土壤微生物群落多样性变化的主要因素。结果表明，在降水强度变化梯度下，半干旱草地细菌和真菌生物量和多样性对土壤性质的响应是非线性的、时变的、相互作用的。
Soil microorganisms are essential participants in ecosystem processes, yet their composition, diversity, and function are affected by altered precipitation. The patterns and key processes driving the effects of changes in precipitation on soil bacterial and fungal communities remain unclear. To better understand how changes in precipitation may affect soil microorganisms, we conducted a three-year field precipitation manipulation experiment, with treatments ranging from 50% reduction to 50% increases in precipitation, in a meadow steppe located in northeast China. Our results demonstrated that the bacterial community was more sensitive to changes in precipitation than the fungal community. The fungal community was sensitive to inter-annual differences in precipitation, but not to the treatment-induced changes in precipitation. Increased annual precipitation shifted the dominance of the microbial community from bacteria to fungi. Over the precipitation range (200–280 mm) soil microbial biomass and diversity are maximal, below the long-term mean annual precipitation (430 mm) for this site. Soil water content, pH, and total phosphorus were the main factors related to the variance in soil microbial community diversity. Results show non-linear, time-dependent, and interacting responses of bacterial and fungal biomass and diversity to soil properties under gradients of altered precipitation magnitude in this semi-arid grassland.
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