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

文献类型： 外文期刊

作者： Wang, Zhufeng 1 ; Wang, Yugang 3 ; Xing, Dengchun 2 ; Wagai, Rota 5 ; Zheng, Jinsen 6 ; Zhang, Haoyuan 7 ; Fan, Bowen 7 ; Feng, Wenting 1 ;

作者机构： 1.Beijing Forestry Univ, Sch Grassland Sci, Beijing 100083, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China

3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Ecol Safety & Sustainable Dev Arid L, Urumqi 830011, Peoples R China

4.Chinese Acad Sci, Fukang Stn Desert Ecol, Fukang 831505, Xinjiang, Peoples R China

5.Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan

6.Japan Int Res Ctr Agr Sci JIRCAS, 1-1 Ohwashi, Tsukuba, Ibaraki 3058686, Japan

7.Weifang Univ, Weifang Municipal Key Lab Agr Planting Quantizat &, Weifang 261000, Shandong, Peoples R China

关键词： Aggregate; Calcium carbonate; Specific surface area; Porosity

期刊名称：CATENA （ 影响因子：5.7； 五年影响因子：6.3 ）

ISSN： 0341-8162

年卷期： 2025 年 257 卷

页码：

收录情况： SCI

摘要： 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 mu m) 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 mu m 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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