Understanding the effects of timber harvesting on soil respiration, including its autotrophic and heterotrophic components and their temperature sensitivity, is crucial for predicting how forest management affects the carbon cycle. Here, we conducted a meta-analysis to assess these effects on a global scale, synthesizing data from 1656 paired observations from 143 studies worldwide. On average, harvesting increased soil respiration by 6.0 %, most significantly in coniferous forests and subtropical regions. The response of total soil respiration was more closely coupled to changes in its heterotrophic than in its autotrophic component. The positive effects of harvesting on both respiration components decreased with increasing harvest intensity and were positively correlated with changes in soil nitrogen, root biomass, and microbial biomass carbon. Harvesting reduced the temperature sensitivity of soil respiration by 6.4 %, particularly in coniferous forests and temperate regions. The temperature sensitivity of soil autotrophic respiration increased in the first years after harvesting compared to the control but was significantly lower in later stages (c. > 6 years) after harvesting. Furthermore, the effects of harvesting on soil respiration, its components and temperature sensitivity varied greatly between post-harvest treatments and seasons of measurement. The results of our synthesis provide a basis for refining ecosystem models to better predict soil carbon dynamics in harvested forests on a global scale.

中文翻译：

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森林采伐对土壤呼吸、其成分和温度敏感性影响的全球荟萃分析


了解木材采伐对土壤呼吸的影响，包括其自养和异养成分及其温度敏感性，对于预测森林管理如何影响碳循环至关重要。在这里，我们进行了一项荟萃分析，以在全球范围内评估这些影响，综合了来自全球 143 项研究的 1656 个配对观察的数据。平均而言，采伐使土壤呼吸增加了 6.0%，在针叶林和亚热带地区最为明显。土壤总呼吸的响应与其异养成分的变化更密切相关，而不是与自养成分的变化耦合。收获对两种呼吸成分的积极影响随着收获强度的增加而降低，并与土壤氮、根系生物量和微生物生物量碳的变化呈正相关。采伐使土壤呼吸的温度敏感性降低了 6.4%，尤其是在针叶林和温带地区。与对照相比，土壤自养呼吸的温度敏感性在收获后的最初几年增加，但在收获后的后期 （c. > 6 年） 显著降低。此外，收获对土壤呼吸、其成分和温度敏感性的影响在收获后处理和测量季节之间差异很大。我们的综合结果为改进生态系统模型提供了基础，以更好地预测全球范围内采伐森林的土壤碳动态。