Role of the soil matrix and minerals in protecting natural organic materials against biological attack
Role of the soil matrix and minerals in protecting natural organic materials against biological attack
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DOI：
10.1016/s0146-6380(00)00049-8
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发表时间：
2000-01-01
影响因子：
3
通讯作者：
Skjemstad, JO
中科院分区：
文献类型：
--
作者：
Baldock, JA;Skjemstad, JO
土壤中的天然有机物质由不同生物化学物质的复杂混合物组成，表现出许多形态和生物氧化阶段。基于化学结构存在可分解性的连续体;然而，这种连续体可以通过与基质中的矿物质的相互作用而改变，所述基质能够稳定潜在不稳定的有机物质以对抗生物氧化。保护不被认为等同于从分解中永久和完全去除有机碳，而是相对于类似的未保护材料降低分解速率。土壤基质对土壤中有机物质的稳定作用取决于土壤矿物组分的化学性质、多价阳离子的存在、能够吸附有机物质的矿物表面的存在以及土壤基质的结构。每种机制提供的保护程度和数量取决于矿物基质的化学和物理性质以及有机物的形态和化学结构。每一种矿物基质都具有独特而有限的稳定有机物的能力。量化土壤的保护能力需要仔细考虑所有保护机制和实验程序的影响。(C)2000爱思唯尔科技有限公司版权所有。
Natural organic materials in soils consist of a complex mixture of different biochemicals exhibiting numerous morphologies and stages of biological oxidation. A continuum of decomposability exists based on chemical structure; however, this continuum can be altered by interactions with minerals within matrices capable of stabilising potentially labile organic matter against biological oxidation. Protection is not considered to equate to a permanent and complete removal of organic C from decomposition, but rather to a reduced decomposition rate relative to similar unprotected materials. The stabilisation of organic materials in soils by the soil matrix is a function of the chemical nature of the soil mineral fraction and the presence of multivalent cations, the presence of mineral surfaces capable of adsorbing organic materials, and the architecture of the soil matrix. The degree and amount of protection offered by each mechanism depends on the chemical and physical properties of the mineral matrix and the morphology and chemical structure of the organic matter. Each mineral matrix will have a unique and finite capacity to stabilise organic matter. Quantifying the protective capacity of a soil requires a careful consideration of all mechanisms of protection and the implications of experimental procedures. (C) 2000 Elsevier Science Ltd. All rights reserved.