Abstract Although efforts to understand the drivers of the soil organic carbon (SOC) in terrestrial ecosystems have paid off, little is known about the temporal and spatial variations in the mean residence time (MRT) of SOC and how MRT varies with the climatic, soil, and vegetation drivers. In this study, the MRT of SOC from 1376 samples of the 0–20 cm soil layer from the main global biomes was derived based on the simultaneously measured SOC pool and soil carbon fluxes. We also evaluated the factors controlling the variations in the MRT of SOC. The results indicate that, across the different biomes, the MRT of SOC (ranging from 0.47 to 56.75 yr) exhibits large variations at the global scale and shows strong quadratic relationship with latitude. The MRT of SOC exhibits a significant and negative trend from the 1980s to the 2010s. The MRT of SOC shows strong negative and nonlinear relationships (P

中文翻译：

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土壤有机碳平均停留时间的时空变化及其与气候、土壤和植被驱动因素的关系

摘要 尽管了解陆地生态系统中土壤有机碳 (SOC) 驱动因素的努力已取得成效，但对 SOC 平均停留时间 (MRT) 的时空变化以及 MRT 如何随气候、土壤和土壤变化的变化知之甚少。和植被驱动程序。在这项研究中，来自主要全球生物群落的 0-20 cm 土壤层的 1376 个样本的 SOC 的 MRT 是基于同时测量的 SOC 库和土壤碳通量推导出来的。我们还评估了控制 SOC 的 MRT 变化的因素。结果表明，在不同的生物群落中，SOC 的 MRT（范围从 0.47 到 56.75 年）在全球范围内表现出很大的变化，并且与纬度呈强二次关系。SOC 的 MRT 从 1980 年代到 2010 年代呈现出显着的负面趋势。