Quantitative relationship between soil properties and adsorption of dissolved organic matter onto volcanic ash and non-volcanic ash soils
Quantitative relationship between soil properties and adsorption of dissolved organic matter onto volcanic ash and non-volcanic ash soils
复制标题
土壤性质与火山灰和非火山灰土壤吸附溶解有机物之间的定量关系
DOI：
10.1080/00380768.2000.10409121
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发表时间：
2000
影响因子：
2
通讯作者：
K. Yonebayashi
中科院分区：
文献类型：
--
作者：
Kei Nambu;K. Yonebayashi
摘要土壤有机无机复合体的形成是土壤碳循环中的一个关键反应，因为有机物质由于复合体的形成而获得抗分解能力。溶解性有机物（DOM）吸附到土壤矿物上提供了一个模型，这一重要过程。通过静态吸附试验，比较了不同土壤性质对DOM吸附行为的影响，并对不同土壤性质对DOM吸附行为的影响进行了定量分析。吸附行为有效地描述了一个线性的初始质量（IM）的等温线，表明吸附效率并没有明显下降的范围内研究，即使大量的DOM施加到土壤样品。与含有相当数量有机碳的其他土壤相比，来自Andisols的样品表现出特别高的吸附效率。对预测效率参数有用的解释变量分两步进行研究：首先考察土壤样品中碳积累的程度，然后结合前面的指标考察配体交换位点的量的指标。结果，最终检测到包括总碳/粘粒（或总碳/比表面积）比和NaF溶液的土壤提取物中的羟基离子的量的指标。前者代表碳在土壤表面的占有程度，后者代表活性铝上配体交换位点的数量。尽管不同土壤的吸附机理不同，但选择指数与吸附效率显著相关。
Abstract The formation of soil organo-mineral complexes is a key reaction in the carbon cycle in soil, since organic materials acquire a resistance to decomposition due to the formation of the complexes. Adsorption of dissolved organic matter (DOM) onto soil minerals provides a model of this important process. Adsorption of DOM onto samples from Andisols, Inceptisols, and Entisols in batch experiments was compared in terms of the quantitative relationship between the soil properties and the adsorption behavior of DOM. Adsorption behavior was effectively described by a linear initial mass (IM) isotherm, indicating that the adsorption efficiency did not appreciably decline in the range studied even though a large amount of DOM was applied to the soil samples. Samples from Andisols showed a particularly high efficiency of adsorption compared with those from other soils which contained a comparable amount of organic carbon. Explanatory variables useful to predict the efficiency parameter were investigated in 2 steps: firstly the degree of carbon accumulation in the soil samples was examined, and next an index for the amount of ligand exchange sites was examined in combination with the former indices. As a result, an index comprising the total carbon/clay (or total carbon/specific surface area) ratio and the amount of hydroxy ions in the soil extracts with NaF solution was eventually detected. The former represents the degree of carbon occupation on the soil surface, and the latter the amount of ligand exchange sites on labile aluminum. Although the mechanisms involved in the adsorption varied among soils, the selected index was significantly correlated with the adsorption efficiency.