土壤团聚体作为土壤结构的核心单元,在维持有机质稳定、调控养分循环及提升土壤抗侵蚀能力中发挥关键作用。热带地区土壤因高度风化、有机质输入少及独特的矿物组成(高岭石、蒙脱石及铁铝氧化物),其团聚体形成与稳定机制显著区别于温带...土壤团聚体作为土壤结构的核心单元,在维持有机质稳定、调控养分循环及提升土壤抗侵蚀能力中发挥关键作用。热带地区土壤因高度风化、有机质输入少及独特的矿物组成(高岭石、蒙脱石及铁铝氧化物),其团聚体形成与稳定机制显著区别于温带土壤。传统层次模型强调有机质在团聚体形成中的主导作用,但热带土壤中无机胶结物质(粘土矿物与氧化物)的交互作用及阳离子桥键效应成为重要驱动因素。研究表明,生物因素(微生物分泌物)、非生物因素(Ca2+和Al3+离子桥)及人类活动(土地利用变化、耕作方式)共同影响团聚体稳定性。然而,热带土壤团聚体稳定性与有机质的关系存在争议,且缺乏普适性理论模型。未来需聚焦成土母岩差异、阳离子作用机制及多因子交互效应,以揭示热带土壤团聚体动态规律,为碳封存和土壤可持续管理提供理论依据。As the core unit of soil structure, soil aggregates play a key role in maintaining the stability of organic matter, regulating nutrient cycling and enhancing soil erosion resistance. Soils in the tropics are significantly different from temperate soils in terms of aggregate formation and stabilisation mechanisms due to their high degree of weathering, low organic matter inputs and unique mineral composition (kaolinite, montmorillonite and iron and aluminium oxides). Traditional hierarchical models emphasise the dominant role of organic matter in agglomerate formation, but the interaction of inorganic cementing materials (clay minerals and oxides) and cationic bridge bonding effects in tropical soils become important drivers. Studies have shown that biotic factors (microbial secretions), abiotic factors (Ca2+ and Al3+ ionic bridges) and human activities (land-use changes, farming practices) combine to influence agglomerate stability. However, the relationship between aggregate stability and organic matter in tropical soils is controversial and lacks universal theoretical models. In the future, we need to focus on the differences in soil-forming parent rocks, cation action mechanisms and multi-factor interaction effects, in order to reveal the dynamics of tropical soil aggregates, and provide a theoretical basis for carbon sequestration and sustainable soil management.展开更多
文摘土壤团聚体作为土壤结构的核心单元,在维持有机质稳定、调控养分循环及提升土壤抗侵蚀能力中发挥关键作用。热带地区土壤因高度风化、有机质输入少及独特的矿物组成(高岭石、蒙脱石及铁铝氧化物),其团聚体形成与稳定机制显著区别于温带土壤。传统层次模型强调有机质在团聚体形成中的主导作用,但热带土壤中无机胶结物质(粘土矿物与氧化物)的交互作用及阳离子桥键效应成为重要驱动因素。研究表明,生物因素(微生物分泌物)、非生物因素(Ca2+和Al3+离子桥)及人类活动(土地利用变化、耕作方式)共同影响团聚体稳定性。然而,热带土壤团聚体稳定性与有机质的关系存在争议,且缺乏普适性理论模型。未来需聚焦成土母岩差异、阳离子作用机制及多因子交互效应,以揭示热带土壤团聚体动态规律,为碳封存和土壤可持续管理提供理论依据。As the core unit of soil structure, soil aggregates play a key role in maintaining the stability of organic matter, regulating nutrient cycling and enhancing soil erosion resistance. Soils in the tropics are significantly different from temperate soils in terms of aggregate formation and stabilisation mechanisms due to their high degree of weathering, low organic matter inputs and unique mineral composition (kaolinite, montmorillonite and iron and aluminium oxides). Traditional hierarchical models emphasise the dominant role of organic matter in agglomerate formation, but the interaction of inorganic cementing materials (clay minerals and oxides) and cationic bridge bonding effects in tropical soils become important drivers. Studies have shown that biotic factors (microbial secretions), abiotic factors (Ca2+ and Al3+ ionic bridges) and human activities (land-use changes, farming practices) combine to influence agglomerate stability. However, the relationship between aggregate stability and organic matter in tropical soils is controversial and lacks universal theoretical models. In the future, we need to focus on the differences in soil-forming parent rocks, cation action mechanisms and multi-factor interaction effects, in order to reveal the dynamics of tropical soil aggregates, and provide a theoretical basis for carbon sequestration and sustainable soil management.
