Wildfires can either negatively impact soil carbon (C) stocks through combustion or increase soil carbon stocks through the production of pyrogenic organic matter (PyOM), which is highly persistent and can affect non-pyrogenic soil organic carbon (SOC) mineralization rates. In this study, we used fine-resolution CO flux tracing to investigate PyOM-C mineralization, soil priming effects, and their impacts on soil microbial communities in a Californian mixed conifer forest Xerumbrept soil burned in the 2014 King Fire. We added PyOM produced from pine biomass at 350 °C and 550 °C to the soil and separately traced the mineralization of C-labeled water-extractable and non-water-extractable PyOM-C fractions in a short-term 30-day incubation.

中文翻译：

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热解有机物添加对土壤碳矿化和微生物群落动态的影响

野火可能会通过燃烧对土壤碳 (C) 储量产生负面影响，也可能会通过产生热解有机物 (PyOM) 增加土壤碳储量，而热解有机物 (PyOM) 具有高度持久性，会影响非热解土壤有机碳 (SOC) 矿化率。在这项研究中，我们使用高分辨率 CO 通量追踪来研究 PyOM-C 矿化、土壤启动效应及其对 2014 年 King Fire 烧毁的加州混合针叶林 Xerumbrept 土壤中土壤微生物群落的影响。我们将在 350 °C 和 550 °C 下由松树生物质产生的 PyOM 添加到土壤中，并在短期 30 天的培养中分别追踪 C 标记的水可提取物和不可水提取物 PyOM-C 部分的矿化。