Control mechanism of short-term fertilization with cattle manure on the release characteristics of soil colloids in farmland: grain size and physicochemical properties

IF 6 3区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Sciences Europe Pub Date : 2024-07-30 DOI:10.1186/s12302-024-00959-w
Xiaoming Song, Zeyu Chen, Qing Zhang, Zhipeng Zhang, Yujuan Wen
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Abstract

Background

Understanding the release characteristics of soil colloids is a prerequisite for studying the co-transport of colloids and pollutants in subsurface environment. As a crucial agricultural management measure, fertilization not only alters the material composition of farmland soil, but also significantly regulates the properties and release patterns of soil colloids. This study systematically investigated the regulatory mechanism of short-term cattle manure fertilization on the macroscopic release and microscopic properties of soil colloids with different particle sizes, providing a theoretical foundation for subsequent research on the fate and transport of agricultural non-point source pollutants.

Results

The colloids in natural agricultural soil primarily consist of inorganic components. Graded extraction of the colloids has revealed that the combined proportion of colloids with particle sizes of 1–2 μm and 0.45–1 μm accounts for approximately 80.5%. Applying cattle manure inhibits the release of soil colloids, and the content of large particle size (1–2 μm) components increases. The content of organic colloids is increased due to the high total organic carbon (TOC) in cattle manure, particularly those with a particle size less than 1 μm. The characterization of organic colloid components revealed a significant increase in aromatic carbon and oxygen-containing functional groups, while the aliphatic content decreased. The response sequence regarding changes in functional groups within organic colloids induced by fertilization was as follows: –CH3, –CH2 > C–O > –OH > C=C. Fertilization promotes the release of 1:1-type inorganic mineral colloids, increasing the content of poorly crystalline minerals. The retention of aromatic carbon and oxygen-containing functional groups by poorly crystalline mineral colloids served as the primary mechanism leading to their increased content levels. Changes in environmental factors significantly impacted the release and properties of soil colloids. Conditions such as low cationic valence, high ionic strength, and high pH promoted the release of soil colloids.

Conclusions

The short-term fertilization resulted in a reduction in the release of soil colloids and brought about significant alterations in their particle size composition and properties. The findings of this study provide valuable insights into understanding the impact of fertilization-induced colloid release on the environmental behavior of agricultural non-point source pollutants.

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牛粪短期施肥对农田土壤胶体释放特性的调控机制:粒度与理化性质
背景了解土壤胶体的释放特性是研究地下环境中胶体与污染物共迁移的前提。施肥作为一项重要的农业管理措施,不仅改变了农田土壤的物质组成,而且对土壤胶体的性质和释放模式具有重要的调控作用。本研究系统研究了短期牛粪施肥对不同粒径土壤胶体的宏观释放和微观性质的调控机制,为后续农业非点源污染物的归宿与迁移研究提供了理论基础。对胶体进行分级萃取后发现,粒径为 1-2 μm 和 0.45-1 μm 的胶体所占比例之和约为 80.5%。施用牛粪抑制了土壤胶体的释放,大粒径(1-2 μm)成分的含量增加。牛粪中的总有机碳(TOC)含量高,特别是粒径小于 1 μm 的有机胶体含量增加。有机胶体成分的表征显示,芳香碳和含氧官能团的含量显著增加,而脂肪族含量则有所减少。施肥引起的有机胶体中官能团变化的反应顺序如下:-CH3, -CH2 > C-O > -OH > C=C。施肥促进了 1:1 型无机矿物胶体的释放,增加了弱结晶矿物的含量。贫晶矿物胶体保留芳香碳和含氧官能团是导致其含量增加的主要机制。环境因素的变化极大地影响了土壤胶体的释放和特性。低阳离子价、高离子强度和高 pH 值等条件促进了土壤胶体的释放。这项研究的结果为了解施肥引起的胶体释放对农业非点源污染物环境行为的影响提供了宝贵的见解。
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来源期刊
Environmental Sciences Europe
Environmental Sciences Europe Environmental Science-Pollution
CiteScore
11.20
自引率
1.70%
发文量
110
审稿时长
13 weeks
期刊介绍: ESEU is an international journal, focusing primarily on Europe, with a broad scope covering all aspects of environmental sciences, including the main topic regulation. ESEU will discuss the entanglement between environmental sciences and regulation because, in recent years, there have been misunderstandings and even disagreement between stakeholders in these two areas. ESEU will help to improve the comprehension of issues between environmental sciences and regulation. ESEU will be an outlet from the German-speaking (DACH) countries to Europe and an inlet from Europe to the DACH countries regarding environmental sciences and regulation. Moreover, ESEU will facilitate the exchange of ideas and interaction between Europe and the DACH countries regarding environmental regulatory issues. Although Europe is at the center of ESEU, the journal will not exclude the rest of the world, because regulatory issues pertaining to environmental sciences can be fully seen only from a global perspective.
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