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The role of aluminum in regulating the retention of cations and dissolved organic carbon in organic forest soil horizons.

机译：铝在调节有机森林土壤层中阳离子和溶解性有机碳保留方面的作用。

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Processes in organic forest soil horizons can play an important role in influencing surface water quality especially in watersheds where shallow flow paths through soil are important. Aluminum has an extremely high affinity for the acidic functional groups present in soil organic matter and binds nearly irreversibly with these groups. This reaction alters the response of organic forest soil horizons to atmospheric deposition as well as other environmental conditions such as calcite treatment. In this study, I evaluated the effect of organically bound aluminum on the retention of cations and dissolved organic carbon (DOC) in organic forest soil horizons.; Field and laboratory results were consistent with the reaction of aluminum with acidic functionality present in soil organic matter, and the resultant effect this reaction has on specific and nonspecific binding of protons and cations, and on DOC release. Under acidic conditions, increasing bound aluminum in organic forest soil horizons was shown to: (1) decrease acidity, and calcium concentrations in soil and solution; (2) decrease release of DOC from soil; and (3) increase aluminum concentration in soil solution. Bound aluminum had similar, but less influence under alkaline conditions, especially with respect to calcium concentrations in soil and solution. Results also showed that the heterogeneity of soil organic matter can diminish the strength of relationship observed between bound aluminum, and other solid and solution phase constituents present in organic forest soil horizons.; Field and laboratory results were reproducible with the Windermere Humic Aqueous Model (WHAM); a mechanistic model that describes proton and metal binding to humic and fulvic acids, and the effect of this binding on the solubility of organic matter. Simulations using WHAM showed that bound aluminum increased the response of organic forest soil horizons and associated solution to the environmental conditions evaluated in this study (i.e., calcite treatment of 9 Mg/hectare and a 50% reduction of individual and combined loading of basic cations and mineral acid anions). Simulations predicted that organic forest soil horizons with higher bound aluminum content would typically respond faster, and produce soil solutions with higher aluminum, and lower hydrogen ion, calcium and DOC concentrations than organic forest soil horizons with lower bound aluminum content.
机译：有机森林土壤视野中的过程可以在影响地表水质量方面发挥重要作用，尤其是在流经土壤的浅流路径很重要的流域中。铝对土壤有机质中存在的酸性官能团具有极高的亲和力，并且几乎不可逆地与这些基团结合。该反应改变了有机森林土壤层对大气沉积以及其他环境条件（如方解石处理）的响应。在这项研究中，我评估了有机结合的铝对有机森林土壤层中阳离子和溶解性有机碳（DOC）保留的影响。现场和实验室结果与铝与土壤有机质中存在的酸性官能团的反应相符，并且该反应对质子和阳离子的特异性和非特异性结合以及DOC释放产生了影响。在酸性条件下，有机森林土壤视野中结合铝的增加表明：（1）降低酸度以及土壤和溶液中的钙浓度; （2）减少土壤中DOC的释放; （3）增加土壤溶液中的铝浓度。结合的铝在碱性条件下具有相似但较小的影响，尤其是在土壤和溶液中的钙浓度方面。结果还表明，土壤有机质的异质性会削弱结合铝与有机森林土壤层中存在的其他固相和固溶相成分之间的关​​系强度。温德米尔腐殖酸水模型（WHAM）可再现现场和实验室结果；一个描述质子和金属与腐殖酸和黄腐酸结合的机理模型，以及这种结合对有机物溶解度的影响。使用WHAM进行的模拟表明，结合铝对本研究评估的环境条件（例如，方解石处理9 Mg /公顷，将单个和组合的碱性阳离子和二氧化氮的负载量减少50％）提高了有机森林土壤层位和相关溶液的响应。无机酸阴离子）。模拟预测，与具有较低结合铝含量的有机森林土壤层相比，具有较高结合铝含量的有机森林土壤层通常会更快地响应，并产生具有较高铝，较低氢离子，钙和DOC浓度的土壤溶液。

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