Abstract Preservation of soil organic carbon (SOC) requires knowledge concerning the quantity and quality of both the SOC and the SOC-decomposing microbial community. In northern Germany, this information is assessed as part of Schleswig-Holstein’s long-term soil-monitoring programme, in which topsoils have been analysed since 1995. In this study, we evaluated long-term data from Schleswig-Holstein’s monitoring sites and compared the content of SOC and microbial biomass carbon (MBC) among croplands, grasslands and forests. We distinguished the microbial fractions as total MBC (chloroform fumigation extraction method) and glucose-responsive MBC, and we used the MBC/SOC ratio and soil basal respiration (SBR) to obtain a qualitative view of the SOC and its turnover potential. Additionally, we performed a temporal comparison for SOC and MBC between the periods 1995–2002 and 2005–2015. The results showed that median SOC content is the highest in forest soils (41 g kg−1), followed by grasslands (33 g kg−1), and croplands (12 g kg−1). Different ascending orders occurred for the total MBC (cropland

中文翻译：

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长期土壤监测网络中不同土地利用类型下土壤有机碳、微生物生物量和活动的时空格局

摘要 土壤有机碳 (SOC) 的保存需要了解 SOC 和 SOC 分解微生物群落的数量和质量。在德国北部，该信息作为石勒苏益格-荷尔斯泰因州长期土壤监测计划的一部分进行评估，自 1995 年以来一直在该计划中分析表土。在这项研究中，我们评估了来自石勒苏益格-荷尔斯泰因州监测点的长期数据，并比较了农田、草地和森林中 SOC 和微生物生物量碳 (MBC) 的含量。我们将微生物组分区分为总 MBC（氯仿熏蒸提取法）和葡萄糖响应 MBC，我们使用 MBC/SOC 比和土壤基础呼吸 (SBR) 来获得 SOC 及其周转潜力的定性视图。此外，我们对 1995-2002 年和 2005-2015 年期间的 SOC 和 MBC 进行了时间比较。结果表明，SOC 含量中位数在森林土壤中最高（41 g kg-1），其次是草地（33 g kg-1）和农田（12 g kg-1）。MBC（农田）总量出现不同升序