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首页> 外文期刊>Pedobiologia >Spatial and temporal patterns in soil organic carbon, microbial biomass and activity under different land-use types in a long-term soil-monitoring network
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Spatial and temporal patterns in soil organic carbon, microbial biomass and activity under different land-use types in a long-term soil-monitoring network

机译：在长期土壤监测网络中不同土地使用类型下土壤有机碳，微生物生物量和活性的空间和时间模式

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摘要

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 < forest < grassland), however, and for the glucose-responsive MBC (forest < cropland < grassland), indicating differences in SOC quality and the microbial community structure. The different ratios between MBC and SOC showed that SOC in croplands and grasslands is characterised as easily degradable, but more stable in grasslands under no-fill conditions. Forest SOC appears almost non-degradable, and thus is most stable in the long term. We concluded that land-use-specific carbon characteristics, including the functional microbial community structure, are beneficial for evaluation of SOC preservation potential. From the temporal perspective, a significant increase (45-114 %) was observable for the total MBC on cropland and grassland sites, whereas the changes in SOC were not significant. The remarkable growth of the total MBC in relation to the glucose-responsive MBC indicates shifts in the microbial community towards a K-strategy metabolism.
机译：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的知识。在北北部，该信息被评估为Schleswig-Holstein的长期土壤监测计划的一部分，其中以自1995年以来已经分析了表土。在本研究中，我们评估了Schleswig-Holstein的监测网站的长期数据并进行了比较农田，草原和森林中SoC和微生物生物量碳（MBC）的内容。我们将微生物馏分与总MBC（氯仿熏蒸萃取方法）和葡萄糖响应MBC区分开，我们使用了MBC / SOC比和土壤基础呼吸（SBR）来获得SoC及其营业额的定性视图。此外，我们在1995 - 2002年和2005 - 2015年期间对SoC和MBC进行了时间比较。结果表明，中位数SoC含量在森林土壤中最高（41克（-1）），其次是草原（33克（-1））和农作物（12克（-1））。然而，对于总MBC（农田<森林<草地）以及葡萄糖响应MBC（森林<农田<草原），表明SOC质量和微生物群落结构的差异，发生了不同的上行订单。 MBC和SoC之间的不同比率表明，农田和草原中的SoC的特征在于在无填充条件下的草原上易于降解。森林SOC几乎似乎是不可降解的，因此长期最稳定。我们得出结论，土地使用特异性碳特性，包括功能微生物群落结构，有利于评估SoC保存潜力。从时间的角度来看，对于农田和草原地点的MBC总数显着增加（45-114％），而SoC的变化则不显着。与葡萄糖响应MBC相关的总MBC的显着生长表明微生物群落变化朝着K-策略代谢。

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