Does soil compaction affect the mobility and transformation behavior of Arsenic -A case study of an Alfisol

IF 6.1 1区 农林科学 Q1 SOIL SCIENCE
Xinjun Huang , Lanting Liu , Yali Wang , Yongqiang Yang , Linlin Zhao , Rainer Horn , Liping Li
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引用次数: 0

Abstract

Soil compaction induced by frequent field traffic often causes surface waterlogging in wheel rut areas during the rainy season. In arsenic (As)-contaminated farmlands, this process creates varying redox conditions that affect As mobility and transformation at different depths. This study examined the effects of compaction on As behavior in a clay loam Alfisol (from A horizon) under periodic waterlogging over 66 days. Four soil columns were packed with two bulk densities of 1.3 g cm⁻³ and 1.65 g cm⁻³ to simulate different compaction treatments across a 0–40 cm profile: no compaction(CK), low compaction(LC), medium compaction (MC), and heavy compaction (HC) with corresponding compacted thickness of 0 cm, 16 cm, 24 cm, and 32 cm. Results showed that compaction significantly decreased soil air permeability (Ka) and redox potential (Eh). During waterlogging, excess water stagnated in compacted layers, creating reducing conditions that promoted the release of the mobile As (III) species into pore water. In the first two waterlogging cycles, As(III) concentrations in pore water peaked at 5.6, 6.2, 7.3, and 8.0 μg L⁻¹ under CK, LC, MC, and HC, respectively, while the average Fe-(hydr)oxide-bound As decreased by 22.9 %, 22.9 %, 23.7 %, and 26.5 %, respectively. During the subsequent waterlogging cycles, with the increase of Ka, Eh, and microbial activity of aerobic species the As was stabilized on soil particles in the fractions of specifically bound As and Fe-(hydr)oxide-bound As with reduced mobility. These findings highlight the potential risks of soil compaction-induced As transformations, particularly the conversion of less mobile As(V) to the more toxic and mobile As(III), posing environmental and health concerns.
土壤压实是否影响砷的迁移和转化行为——以一种Alfisol为例
在雨季,频繁的野外交通引起的土壤压实常常造成轮辙区地表积水。在砷(As)污染的农田中,这一过程产生不同的氧化还原条件,影响砷在不同深度的迁移和转化。本研究考察了在周期性涝渍超过66天的条件下,压实对Alfisol黏土壤土As行为的影响。四个土壤列挤满了两个体积密度的1.3 g  厘米⁻³  和1.65 g 厘米⁻³ 来模拟不同的压实的治疗在0-40 厘米简介:没有压实(CK),压实(LC)低,介质压实(MC)和重型压实(HC)与相应的压实厚度0 厘米,16 厘米,24 厘米,和32 厘米。结果表明,压实显著降低了土壤透气性(Ka)和氧化还原电位(Eh)。在涝渍过程中,多余的水滞留在压实层中,创造了还原条件,促进了可移动的As (III)物质释放到孔隙水中。在前两个涝渍循环中,孔水中As(III)浓度在CK、LC、MC和HC处理下分别达到峰值5.6、6.2、7.3和8.0 μg L⁻¹ ,而Fe-(水)氧化结合As的平均浓度分别下降22.9 %、22.9 %、23.7 %和26.5 %。在随后的涝渍循环中,随着Ka、Eh和好氧物种微生物活性的增加,As在土壤颗粒上以特异性结合As和铁(水)氧化物结合As的形式稳定下来,迁移率降低。这些发现突出了土壤压实引起的砷转化的潜在风险,特别是将流动性较差的砷(V)转化为毒性更强的砷(III),从而引起环境和健康问题。
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来源期刊
Soil & Tillage Research
Soil & Tillage Research 农林科学-土壤科学
CiteScore
13.00
自引率
6.20%
发文量
266
审稿时长
5 months
期刊介绍: Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.
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