Characteristics of Dissolved Organic Matter (DOM) Combined with As in Fe-Rich Red Soils of Tea Plantations in the Southern Anhui Province, East China

IF 4.5 2区农林科学 Q1 AGRONOMY

Agriculture-Basel Pub Date : 2024-12-13 DOI:10.3390/agriculture14122289

Youru Yao, Juying Li, Kang Ma, Jingyi Zhang, Y. S. Lin, Huarong Tan, Jia Yu, Fengman Fang

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引用次数: 5

Abstract

Dissolved organic matter (DOM) is widely present in soil environments and plays a crucial role in controlling the morphology, environmental behavior, and hazards of arsenic (As) in soil. In the Fe-rich red soil of tea plantations, the decomposition of tea tree litter complicates DOM properties, leading to more uncertain interactions between DOM, Fe, and As. This study focused on three tea plantations in Huangshan City to investigate the contents of DOM, Fe, and As in surface red soils (Ferralsols) and establish their correlations. Three-dimensional fluorescence spectroscopy and PARAFAC analysis methods were used to analyze the DOM components and fluorescence signatures. Additionally, the process and mechanism of the binding of DOM-Fe with As were explored through laboratory experiments on the morphological transformation of As by DOM-Fe. The results showed that the pH values of the soils in the three tea plantations ranged from 3.9 to 5.2, and the entire sample was strongly acidic. The DOM exhibited strong intrinsic properties and low humification, containing three types of humic acid components and one intermediate protein component. The DOC content in the Fe-rich red soil did not have a direct correlation with Fe and As, but the interaction of DOM fractions with Fe significantly influenced the As content. Specifically, the interaction of protein-like fractions with Fe had a more pronounced effect on the As content. The maximum sorption rate of As by DOM was 15.45%, and this rate increased by 49 to 75% with the participation of Fe. In the configuration of the metal electron bridge, Fe acts as a cation, forming a connecting channel between the negatively charged DOM and As, thus enhancing the DOM’s binding capacity to As. DOM-Fe compounds bind As through surface pores and functional groups. These findings provide deeper insights into the influence of DOM on As behavior in Fe-rich soil environments and offer theoretical support for controlling As pollution in red soil.

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皖南富铁茶园红壤中溶解有机质（DOM）与砷的结合特征

溶解有机质（DOM）广泛存在于土壤环境中，在控制土壤中砷的形态、环境行为和危害方面起着至关重要的作用。在茶园富铁红壤中，茶树凋落物的分解使DOM性质复杂化，导致DOM、Fe和As之间的相互作用更加不确定。本研究以黄山市3个茶园为研究对象，研究了红壤表层DOM、Fe和As的含量，并建立了它们之间的相关性。采用三维荧光光谱和PARAFAC分析方法对DOM成分和荧光特征进行了分析。此外，通过DOM-Fe对As的形态转化实验，探讨了DOM-Fe与As结合的过程和机理。结果表明：3个茶园土壤pH值在3.9 ~ 5.2之间，整体呈强酸性；DOM具有较强的固有特性和较低的腐殖化程度，含有3种类型的腐植酸成分和1种中间蛋白成分。富铁红壤DOC含量与Fe、As含量无直接相关关系，但DOM组分与Fe的交互作用显著影响As含量。具体而言，蛋白质样组分与铁的相互作用对砷含量的影响更为显著。DOM对As的最大吸附率为15.45%，Fe的加入使吸附率提高了49% ~ 75%。在金属电子桥构型中，Fe作为阳离子，在带负电荷的DOM和as之间形成连接通道，从而增强了DOM对as的结合能力。DOM-Fe化合物通过表面孔隙和官能团与砷结合。这些发现为深入了解富铁土壤环境中DOM对As行为的影响提供了理论依据，为红壤As污染的控制提供了理论支持。

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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来源期刊

Agriculture-Basel Agricultural and Biological Sciences-Food Science

CiteScore

4.90

自引率

13.90%

发文量

1793

审稿时长

11 weeks

期刊介绍： Agriculture (ISSN 2077-0472) is an international and cross-disciplinary scholarly and scientific open access journal on the science of cultivating the soil, growing, harvesting crops, and raising livestock. We will aim to look at production, processing, marketing and use of foods, fibers, plants and animals. The journal Agriculturewill publish reviews, regular research papers, communications and short notes, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.