胶体颗粒大小对两种碱性土壤理化性质和聚集行为的影响

IF 5.8 2区 农林科学 Q1 SOIL SCIENCE
Soil Pub Date : 2024-06-11 DOI:10.5194/egusphere-2024-1266
Yuyang Yan, Xinran Zhang, Chenyang Xu, Junjun Liu, Feinan Hu, Zengchao Geng
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引用次数: 0

摘要

摘要土壤胶体颗粒是最活跃的成分,其元素组成和环境行为也随颗粒大小而变化。本研究旨在阐明粒径如何影响土壤胶体的理化性质和聚集动力学,并进一步揭示其内在机理。本研究将两种碱性土壤-楼兰土和肉桂土的土壤胶体颗粒细分为三个范围:d < 2 μm、d < 1 μm和d < 100 nm。对有机和无机碳含量、粘土矿物学、表面电化学特性(包括表面官能团和 zeta 电位)进行了表征。通过时间分辨光散射技术,研究了土壤胶体组分的聚集动力学,并确定了其临界凝聚浓度(CCCs)。随着胶体颗粒直径的减小,总碳含量、有机碳含量、有机官能团含量和伊利石含量均有所增加。绝对 zeta 电位值和电荷变异性随颗粒直径的减小而减小。娄土和桂土胶体的 CCC 值从大到小依次为 d < 100 nm、d < 1 μm、d < 2 μm。与过程派(d < 1 μm和d < 2 μm)相比,土壤纳米粒子含有更多的有机碳和更稳定的粘土矿物(d < 100 nm),因此它们表现出最强的胶体悬浮稳定性。有机质含量和粘土矿物性的差异是娄土和桂土胶体尺寸效应背后胶体悬浮稳定性差异的根本原因。本研究揭示了两种碱性土壤胶体对碳含量、粘土矿物、表面性质和悬浮稳定性的尺寸效应,强调了土壤纳米粒子容易更稳定地分散而不是聚集。这些发现可为深入了解异质土壤有机矿物复合物的环境行为提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of colloidal particle size on physicochemical properties and aggregation behaviors of two alkaline soils
Abstract. Soil colloidal particles are the most active components of all, and they also vary in elemental composition and environmental behaviors with the particle size. The purposes of the present study are to clarify how particle size affects the physiochemical properties and aggregation kinetics of soil colloids, and to further reveal the underlying mechanisms. Soil colloidal particles from two alkaline soils—Lou soil and cinnamon soil were subdivided into three ranges: d < 2 μm, d < 1 μm and d < 100 nm. The organic and inorganic carbon contents, clay mineralogy, surface electrochemical properties, including surface functional groups and zeta potentials, were characterized. Through time-resolved light scattering technique, the aggregation kinetics of soil colloidal fractions were investigated, and their critical coagulation concentrations (CCCs) were determined. With decreasing colloidal particle diameter, the total carbon content, organic carbon, organic functional groups content and illite content all increased. The absolute zeta potential values and the charge variability decreased with decreasing particle diameter. The CCC values of Lou soil and cinnamon soil colloids followed the descending order of d < 100 nm, d < 1 μm, d < 2 μm. Compared with the course factions (d < 1 μm and d < 2 μm), soil nanoparticles were more abundant in organic carbon and more stable clay minerals (d < 100 nm), thus they exhibited strongest colloidal suspension stability. The differences in organic matter contents and clay mineralogy are the fundamental reasons for the differences in colloidal suspension stability behind the size effects of Lou soil and cinnamon soil colloids. The present study revealed the size effects of two alkaline soil colloids on carbon content, clay minerals, surface properties and suspension stability, emphasizing that soil nanoparticles are prone to be more stably dispersed instead of being aggregated. These findings can provide references for in-depth understanding of the environmental behaviors of the heterogeneous soil organic-mineral complexes.
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来源期刊
Soil
Soil Agricultural and Biological Sciences-Soil Science
CiteScore
10.80
自引率
2.90%
发文量
44
审稿时长
30 weeks
期刊介绍: SOIL is an international scientific journal dedicated to the publication and discussion of high-quality research in the field of soil system sciences. SOIL is at the interface between the atmosphere, lithosphere, hydrosphere, and biosphere. SOIL publishes scientific research that contributes to understanding the soil system and its interaction with humans and the entire Earth system. The scope of the journal includes all topics that fall within the study of soil science as a discipline, with an emphasis on studies that integrate soil science with other sciences (hydrology, agronomy, socio-economics, health sciences, atmospheric sciences, etc.).
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