吸附作用延缓了秸秆溶解有机物对含硫粘土的修复作用

IF 4 2区 农林科学 Q2 SOIL SCIENCE European Journal of Soil Science Pub Date : 2024-09-05 DOI:10.1111/ejss.13574
Angelika Kölbl, Luke Mosley, Rob Fitzpatrick, Klaus Kaiser
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引用次数: 0

摘要

当硫化土壤排水不畅时,黄铁矿的氧化会导致酸化,并形成铁(Fe)羟基硫酸盐相,如硫铁矿。通过重建还原条件进行修复,需要浸没并添加可生物降解的有机碳(OC),以刺激还原菌的活性。在沙质硫酸土壤(pH 值为 4)中,添加秸秆衍生的溶解有机碳 (DOC) 可诱导微生物快速还原。在粘质硫酸土壤中,DOC 的效率可能较低,因为它吸附在活性矿物质上,对微生物的可用性有限。我们通过一系列培养和吸附实验,测试了吸附对秸秆衍生 DOC 的修复潜力可能产生的影响,并使用固态 13C-NMR 光谱对 OC 进行了化学表征。实验材料为含粘土、石榴石的硫化土壤(pH 值为 3),以及由合成石榴石与石英粉或石英粉 + 粘土矿物混合组成的人工模拟土壤。结果表明,添加小麦秸秆中的 DOC 会引起随土壤吸附性而变化的还原条件。在模型土壤中,DOC 的吸附量很小,添加 0.8 mg OC g-1 的 DOC 就足以实现永久还原条件,并将 pH 值提高到 6.0。在天然硫化土壤中,需要添加更高的 DOC(1.8 毫克 OC g-1)来促进持续的还原条件,但 pH 值仅上升到不高于 5.0-5.5 的水平。天然土壤对添加的 DOC 有很强的吸附作用。吸附作用优先降低了蛋白质的比例,而在还原条件下微生物难以利用的木质素成分在溶液中的比例仍然相对较高。因此,需要添加大量 DOC 才能克服吸附引起的 OC 可用性限制。研究结果表明,小麦秸秆衍生 DOC 也是一种很有前景的修复含硫粘土的方法;不过,需要对 OC 的添加量进行调整,以弥补可能出现的吸附现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Sorption retards remediation of clayey sulfuric soils with straw-derived dissolved organic matter

When sulfidic soils become drained, oxidation of pyrite can cause acidification and formation of iron (Fe) oxyhydroxy sulfate phases such as jarosite. Remediation via re-establishment of reducing conditions requires submergence and addition of biodegradable organic carbon (OC) to stimulate activity of reducing bacteria. Addition of straw-derived dissolved organic carbon (DOC) has been shown to induce rapid microbial reduction in sandy sulfuric (pH <4) soils. In clayey sulfuric soil, DOC may be less efficient because of limited availability for microbes due to its sorption to reactive minerals. We tested the possible effect of sorption on the remediative potential of straw-derived DOC using a set of incubation and sorption experiments, and used solid-state 13C-NMR spectroscopy for the chemical characterization of OC. The tested materials were a clayey, jarosite-containing sulfuric soil (pH 3), and artificial model soils composed of synthesized jarosite either mixed with quartz powder or quartz powder + clay minerals. The results showed that addition of DOC from wheat straw induces reduction conditions varying with soil sorptivity. For the model soils, DOC sorption was little, and DOC additions of 0.8 mg OC g−1 were sufficient to achieve permanently reducing conditions and an increase in pH to >6.0. In the natural sulfuric soil, much higher DOC additions were needed (1.8 mg OC g−1) to facilitate continuous reducing conditions, but pH increased only to values no higher than 5.0–5.5. The natural soil revealed strong sorption of added DOC. Sorption preferentially reduced the proportion of proteins, while the proportion of lignin components, which can hardly be used by microorganisms under reducing conditions, remained relatively high in solution. Thus, high DOC additions were required to overcome the sorption-induced limitations in OC availability. The results suggest that wheat straw-derived DOC is a promising approach also for remediation of clayey sulfuric soils; however, OC additions need to be adjusted to compensate for possible sorption.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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