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首页> 外文期刊>Journal of plant nutrition and soil science >Organic-carbon fractions in an agricultural topsoil assessed by the determination of the soil mineral surface area
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Organic-carbon fractions in an agricultural topsoil assessed by the determination of the soil mineral surface area

机译：通过确定土壤矿物表面积来评估农业表层土壤中的有机碳组分

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According to recent conceptual models, the organic carbon (OC) of soils can be divided into OC fractions of increasing stability from labile free OC to resistant OC associated with the soil mineral phase. In this study, we present a method for quantifying two OC fractions based on soil aggregate-size fractionation and the N_2 gas-adsorption method. For this purpose, we analyzed soil material of the plow layer of a Haplic Chernozem subjected to different fertilizer treatments (no fertilizer, mineral fertilizer, mineral and organic fertilizer). The total organic-C concentration (TOC) and the clay content of the different size fractions were determined as well as the specific surface area (SSA_(mineral)) and the sample pore volume after thermal oxidation (OC-free). The TOC of the different soil-aggregate fractions was linearly related to SSA_(mineral). Clay-associated OC and nonassociated OC fractions of the different soil samples were quantified using two methods based on the OC surface loading at the clay fraction. The application of organic fertilizer increased the amount of nonassociated OC but hardly affected the concentration of clay-associated OC. This finding agrees with previous studies on C dynamics in soils and indicates a finite capacity of soil materials to sequester OC. Even without any addition of organic fertilizer, the mineral phase of the analyzed soil material appears to be C-saturated.
机译：根据最新的概念模型，土壤中的有机碳（OC）可以分为从不稳定的游离OC到与土壤矿物相相关的抗性OC不断增加的稳定性的OC馏分。在这项研究中，我们提出了一种基于土壤团粒大小分级和N_2吸附法定量两个OC组分的方法。为此，我们分析了经过不同肥料处理（未施肥，矿物肥料，矿物和有机肥料）的Haplic Chernozem耕层的土壤材料。确定了总有机碳浓度（TOC）和不同大小分数的粘土含量，以及比表面积（SSA_（矿物））和热氧化后的样品孔体积（无OC）。不同土壤-骨料级分的TOC与SSA_（矿物）线性相关。基于粘土部分的OC表面载荷，使用两种方法对不同土壤样品的粘土相关OC和非相关OC部分进行了定量。有机肥的施用增加了非缔合OC的含量，但几乎不影响粘土缔合OC的浓度。这一发现与先前关于土壤中碳动力学的研究相吻合，并表明土壤材料螯合OC的能力有限。即使不添加任何有机肥料，被分析土壤材料的矿物相似乎也是C饱和的。

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