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Non-monotonic and distinct temperature responses of respiration of soil microbial functional groups
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2020-06-17 , DOI: 10.1016/j.soilbio.2020.107902
Zhongkui Luo , Zuoxin Tang , Xiaowei Guo , Jiang Jiang , Osbert Jianxin Sun

The fate of soil carbon (C) under climatic warming predominantly depends on temperature sensitivity of soil microbial functioning, but it is poorly understood. Using temporal measurements of soil respiration in an incubation experiment with cross-inoculation of microbial communities to contrasting soils, we constrained a microbial-explicit C model to infer temperature responses of two general microbial functional groups: fast-growing r-vs slow-growing K-strategists. We found that the two groups exhibit distinct, non-monotonic temperature responses, and fast-growing r-strategists are more sensitive to temperature changes than slow-growing K-strategists. Both historical environments, under which the microbial communities were originated, and current environment, under which the microbial communities are colonized/adapted, significantly shape the temperature responses of the two groups. Our findings highlight the importance of combined effects of historical and current environment on microbial decomposition for regulating soil C dynamics under warming. We suggest that distinct, non-monotonic temperature responses of microbial functional groups may cause pronounced feedbacks between soil C dynamics and warming depending on climate-soil-microbe interactions.



中文翻译:

土壤微生物功能群呼吸的非单调和不同温度响应

气候变暖下土壤碳(C)的命运主要取决于土壤微生物功能的温度敏感性,但人们对此知之甚少。通过在微生物群落交叉接种与对比土壤的温育实验中使用土壤呼吸的时间测量,我们限制了微生物-显性C模型来推断两个通用微生物功能组的温度响应:快速生长的r-vs缓慢生长的K策略家。我们发现两组显示出不同的非单调温度响应,并且快速增长的r策略家比缓慢增长的k策略家对温度变化更敏感。既有微生物群落起源的历史环境,又有微生物群落定殖/适应的当前环境,显着影响了两组的温度响应。我们的发现强调了历史和当前环境对微生物分解的综合影响对于调节变暖条件下土壤碳动态的重要性。我们建议微生物功能组的不同,非单调的温度响应可能会导致C动力学和变暖之间的明显反馈,具体取决于气候-土壤-微生物的相互作用。

更新日期:2020-06-17
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