Divergent effects of soil organic matter and carbonate on soil aggregation and structure in arid regions

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-05-29 DOI:10.1016/j.catena.2025.109196

Zhufeng Wang , Yugang Wang , Dengchun Xing , Rota Wagai , Jinsen Zheng , Haoyuan Zhang , Bowen Fan , Wenting Feng

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引用次数: 0

Abstract

Understanding how calcium carbonate (CaCO₃) mediates soil aggregation and structure has important implications for soil organic carbon sequestration. Despite its prevalence in arid regions, the impact of CaCO₃ on soil structure remains frequently overlooked and poorly understood. This study aimed to i) explore the relationships between organic and inorganic binding agents and soil aggregation across macro- to micro-scales, as indicated by mean weighted diameter (MWD), specific surface area (SSA), and porosity, and ii) assess the changes in SSA and porosity before and after CaCO₃ removal in bulk soil and aggregate fractions. Conducting research along an elevation gradient in the Tianshan mountain, we evaluated soil aggregation indicators alongside organic binding agents (i.e., soil organic matter, SOM) and inorganic agents (i.e., CaCO₃, exchangeable Ca, iron/alumina (hydro)oxides, and silt-clay). Our findings indicate that SOM primarily contributes to MWD, promoting macro-aggregate (>250 μm) formation. The influence of SOM on SSA and total pore volume (TPV) varies with elevation sites, underscoring a SOM content-dependent relationship. Conversely, CaCO₃ and exchangeable Ca form micro-aggregates in calcareous soils. Notably, CaCO₃ exhibited a negative correlation with SSA and TPV, while its removal led to increased SSA and TPV in bulk soil and <53 μm aggregates. This research highlights the divergent roles of SOM and carbonate in soil aggregation and their interactions in arid environments, emphasizing the importance of managing CaCO₃ levels to maintain soil structure and organic carbon sequestration potential.

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干旱区土壤有机质和碳酸盐对土壤团聚体和结构的发散效应

了解碳酸钙（CaCO3）如何调节土壤团聚和结构对土壤有机碳固存具有重要意义。尽管CaCO3在干旱地区普遍存在，但它对土壤结构的影响仍然经常被忽视和知之甚少。本研究旨在i)通过平均加权直径（MWD）、比表面积（SSA）和孔隙度，探索有机和无机结合剂与土壤团聚体在宏观到微观尺度上的关系；ii)评估CaCO3去除前后土体和团聚体组分中SSA和孔隙度的变化。在天山沿着海拔梯度进行研究，我们评估了土壤团聚指标以及有机结合剂（即土壤有机质，SOM）和无机结合剂（即CaCO3，交换性Ca，铁/氧化铝（氢）氧化物和粉砂粘土）。我们的研究结果表明，SOM对随钻测井的主要贡献是促进宏观团聚体（>250 μm）的形成。SOM对SSA和总孔隙体积（TPV）的影响随海拔高度的不同而不同，强调了SOM含量的依赖关系。相反，碳酸钙和交换性钙在钙质土壤中形成微团聚体。值得注意的是，CaCO3与SSA和TPV呈负相关，而CaCO3的去除导致大块土和<；53 μm团聚体中的SSA和TPV增加。本研究强调了干旱环境下SOM和碳酸盐在土壤团聚体及其相互作用中的不同作用，强调了管理CaCO3水平对维持土壤结构和有机碳固存潜力的重要性。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.