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首页> 外文期刊>Polar biology >Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic
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Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic

机译：海洋南极土壤对异养微生物温度升高的响应

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Understanding relationships between environmental changes and soil microbial respiration is critical for predicting changes in soil organic carbon (SOC) fluxes and content. The maritime Antarctic is experiencing one of the fastest rates of warming in the world and is therefore a key location to examine the effect of temperature on SOC mineralization by the respiration of soil micro-organisms. However, depletion of the labile substrates at higher temperatures relative to the total SOC and greater temperature sensitivity of recalcitrant components of the SOC confound simple interpretations of the effects of warming. We have addressed these issues by testing the hypothesis that respiration by heterotrophic soil micro-organisms is not down-regulated with increasing temperature by comparing the increase in biomass-specific respiration rate with temperature to the increase in respiration rate per unit SOC. We used five soils from the maritime Antarctic ranging in latitude and SOC content and measured the soil respiratory responses to temperatures ranging from 2 to 50 A degrees C in laboratory incubations lasting up to 31 days. In all cases, soil respiration increased with temperature up to 50 A degrees C, even though this exceeds the temperatures normally be experienced, indicating that the community contained sufficient physiological diversity to be able to respire over large temperature ranges. Both the biomass-specific respiration rate and the overall rate of SOC mineralization increased with temperature, which we interpret as respiration by soil micro-organisms not down-regulating relative to temperature.
机译：了解环境变化与土壤微生物呼吸之间的关系对于预测土壤有机碳（SOC）通量和含量的变化至关重要。海洋南极正经历着世界上最快的变暖速率之一，因此是检查温度对土壤微生物呼吸作用对SOC矿化的影响的关键位置。但是，相对于总SOC而言，不稳定底物在较高温度下的耗竭和SOC难降解成分的较高温度敏感性混淆了对升温影响的简单解释。通过比较生物量特异性呼吸速率随温度的升高与单位SOC呼吸速率的升高之间的关系，我们通过检验以下假设解决了这些问题：异养土壤微生物的呼吸速率并未随温度升高而下调。我们使用了来自海洋南极的五种土壤，其纬度和SOC含量在实验室培养中持续了31天，测量了土壤对2至50 A摄氏度温度的呼吸响应。在所有情况下，即使温度超过通常所经历的温度，土壤呼吸也会随着温度升高至50 A摄氏度而增加，这表明该群落包含足够的生理多样性，能够在较大温度范围内呼吸。生物量特定的呼吸速率和SOC矿化的总体速率均随温度而增加，我们将其解释为土壤微生物的呼吸作用并未相对于温度下调。

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