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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Soil organic carbon, extracellular polymeric substances (EPS), and soil structural stability as affected by previous and current land-use
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Soil organic carbon, extracellular polymeric substances (EPS), and soil structural stability as affected by previous and current land-use

机译：土壤有机碳，细胞外聚合物物质（EPS）和土地结构影响的土壤结构稳定性

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While soil microbial ecology, soil organic carbon (SOC) and soil physical quality are widely understood to be interrelated - the underlying drivers of emergent properties, from land management to biochemistry, are hotly debated. Biological binding agents, microbial exudates, or 'extracellular polymeric substances' (EPS) in soil are now receiving increased attention due to several of the existing methodological challenges having been overcome. We applied a recently developed approach to quantify soil EPS, as extracellular protein and extracellular polysaccharide, on the well-characterised soils of the Highfield Experiment, Rothamsted Research, UK. Our aim was to investigate the links between agricultural land use, SOC, transient binding agents known as EPS, and their impacts on soil physical quality (given by mean weight diameter of water stable aggregates; MWD). We compared the legacy effects from long-term previous land-uses (unfertilised grassland, fertilised arable, and fallow) which were established > 50 years prior to investigation, crossed with the same current land-uses established for a duration of only 2.5 years prior to sampling. Continuously fallow and grassland soils represented the poorest and greatest states of structural integrity, respectively. Total SOC and N were found to be affected by both previous and current land-uses, while extractable EPS and MWD were driven primarily by the current land- use. Land-use change between these two extremes (fallow -> grass; grass -> fallow) resulted in smaller SOC differences (64% increase or 37% loss) compared to MWD (125% increase or 78% loss). SOC concentration correlated well to MWD (adjusted R-2 = 0.72) but the greater SOC content from previous grassland was not found to contribute directly to the current stability (p < 0.05). Our work thus supports the view that certain distinct components of SOC, rather than the total pool, have disproportionately important effects on a soil's structural stability. EPS-protein was more closely related to aggregate stability than EPS-polysaccharide (p values of 0.002 and 0.027, respectively), and ranking soils with the 5 greatest concentrations of EPS-protein to their corresponding orders of stability (MWD) resulted in a perfect match. We confirmed that both EPS-protein and EPS-polysaccharide were transient fractions: supporting the founding models for aggregate formation. We suggest that management of transient binding agents such as EPS -as opposed to simply increasing the total SOC content- may be a more feasible strategy to improve soil structural integrity and help achieve environmental objectives.
机译：虽然土壤微生物生态学，土壤有机碳（SOC）和土壤物质质量被广泛理解为相互关联 - 从土地管理到生物化学的兴奋性质的潜在驱动因素都是热烈的辩论。由于克服了几种现有的方法挑战，土壤中的生物结合剂，微生物渗滤物或土壤中的细胞外聚合物物质'（EPS）正在受到提高注意。我们应用了最近开发的方法来量化土壤EPS，作为细胞外蛋白和细胞外多糖，在高田实验，Rothamsted Research，UK。我们的目的是调查农业用地使用，SoC，瞬态结合剂的联系，称为EPS，它们对土壤物质质量的影响（由水稳定的聚集体的平均重量直径给出; MWD）。我们将遗留效应与长期以前的土地用途（未受精草原，受精）在调查前建立的长期效果（未受精草地，受精，耕地，休耕）与持续的相同目前的土地用途越过2.5岁抽样。不断休耕和草原土壤分别代表了最贫穷和最大的结构完整性状态。发现总SOC和N受到之前和目前的土地用途影响，而可提取的EPS和MWD主要由目前的土地使用驱动。与MWD相比SOC浓度与MWD相关（调整后R-2 = 0.72），但未发现从先前草地的SOC含量直接导致当前稳定性（P <0.05）。因此，我们的工作支持了SoC，而不是总池的某些独特的组件对土壤结构稳定性的影响不一致。 EPS-蛋白与聚集稳定性更密切相关，而不是EPS-多糖（分别为0.002和0.027个），并将5种最大浓度的EPS-蛋白排序到其相应的稳定性（MWD）中导致完美的土壤比赛。我们证实，EPS-蛋白和EPS-多糖都是瞬时分数：支持骨料形成的创始模型。我们建议，EPS -A等瞬态结合剂的管理反对简单地增加了总体的SOC含量 - 可以是改善土壤结构完整性的更具可行的策略，并有助于实现环境目标。

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