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| 不同有机改良剂对矿区土壤溶解性有机质及其铅赋存形态的影响机制 |
| Effects of different organic amendments on dissolved organic matter and lead occurrence formation in soil of mining areas |
| 投稿时间：2022-02-23 |
| DOI：10.13254/j.jare.2022.0092 |
| 中文关键词: 有机改良剂，土壤，溶解性有机质，铅形态，羊粪，海藻，生物炭 |
| 英文关键词: organic amendments, soil, dissolved organic matter, Pb form, sheep manure, seaweed, biochar |
| 基金项目:海南省自然科学基金项目（322MS017）；海南省基础与应用基础研究计划（自然科学领域）高层次人才基金项目（2019RC022） |
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| 中文摘要: |
| 为探讨不同来源有机改良剂对污染土壤溶解性有机质（DOM）分子特征及重金属环境行为的影响机制，本研究选择3种不同来源的有机改良剂，以海南省昌化矿区铅（Pb）污染土壤为研究对象，以不施有机改良剂的土壤为空白对照处理，对3种不同有机改良剂处理（添加5%羊粪、海藻有机肥、小麦秸秆生物炭）的土壤进行培养实验。结果表明：施用有机改良剂能显著提高土壤溶解性有机碳（DOC）含量，在培养后期DOC含量逐渐降低；除了生物炭，其他3种处理高分子量芳香碳类物质（C2）占比随培养时间增加而降低，较低分子量的氧化醌类物质（C3）占比提高。红外光谱特征表明施用有机改良剂后土壤中DOM的官能团主要是氨基酸N—H键和羟基—OH；随着培养时间的增加，4种处理均能提高土壤中水溶态Pb含量，其中海藻处理的水溶态Pb含量最高，达到1.91 mg·kg-1，可还原态/铁锰氧化物结合态是Pb的主要存在形态（48%~54%）。不同培养时间的冗余分析表明土壤DOC含量以及相关官能团与土壤Pb含量和形态存在相关性，土壤溶液中的Pb主要受控于土壤溶液中的DOM，海藻和羊粪处理能够增加土壤中水溶态Pb和EDTA-Pb的含量。研究表明，施用有机改良剂改变了土壤中DOM的性质，进而影响土壤中水溶态Pb和有效态Pb含量。 |
| 英文摘要: |
| To study the effects of different organic amendments on the molecular characteristics of dissolved organic matter (DOM) and the environmental behavior of heavy metals in contaminated soil, three organic amendments and lead (Pb) -contaminated soils from the Changhua mining area in Hainan Province were selected as research materials. Incubation experiments were carried out on soils treated with three different organic amendments (5% sheep manure, seaweed organic fertilizer, and wheat straw biochar), and blank control without organic amendments. The results showed that dissolved organic carbon (DOC) content in the soil was significantly increased using organic amendments, and the DOC content gradually decreased at the later stage of incubation. Except biochar, the proportion of high molecular weight aromatic carbons (C2) in the other three treatments decreased with the increase of incubation time, and the proportion of oxidized quinones with lower molecular weight (C3) increased. The infrared spectrum showed that the functional groups of DOM in soil after the application of organic amendments were mainly N—H and hydroxyl —OH. With the increase of incubation time, all the four treatments showed an increase in the water-soluble Pb content in the soil. Among them, the seaweed treatment showed the highest content of watersoluble Pb, reaching 1.91 mg · kg-1. The reducible state/iron-manganese oxide binding state was the main form of Pb (48%-54%). Redundancy analysis at different incubation time showed a correlation between soil DOC content and related functional groups and soil Pb content and form. Pb in the soil solution was mainly controlled by DOM in the soil solution. Seaweed and sheep manure treatments increased the content of water-soluble Pb and EDTA-Pb in the soil. The application of organic amendments changed the properties of DOM in soil and affected the contents of water-soluble and available Pb in soil, which provided a theoretical basis for the remediation of heavy metal-contaminated soil by organic amendments. |
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