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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >The influence of mineral characteristics on organic matter content, composition, and stability of topsoils under long-term arable and forest land use
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The influence of mineral characteristics on organic matter content, composition, and stability of topsoils under long-term arable and forest land use

机译：长期耕作和林地利用下矿物特性对表层土壤有机质含量，组成和稳定性的影响

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In this study, we analyzed the influence of soil mineral characteristics (e.g., clay concentration and mineralogical composition, iron and aluminum oxide concentration and crystallinity, specific surface area, and exchangeable cation concentration) on (i) organic carbon (OC) content (kg m ~(-2)) and (ii) the concentration (g kg ~(-1)), composition, and stability of the mineral-associated organic matter (OM) of arable and forest topsoils. We selected seven soil types with different mineral characteristics for this study. For each soil type, samples were taken from topsoils of a deciduous forest and an adjacent arable site. The arable and forest sites have been used continuously for more than 100years. Na-pyrophosphate soluble OM fractions (OM(PY)), representing mineral-associated OM, were extracted, analyzed for OC and ~(14)C concentrations, and characterized by FTIR spectroscopy. For the forest and arable topsoils, a linear relationship was found between the OC content and exchangeable Ca. For the arable topsoils (pH 6.7-7.5), correlation analyses indicated that the OC _(PY) concentration increased with an increase in oxalate soluble Fe and Al, exchangeable Ca, and Na-pyrophosphate soluble Mg and Fe concentrations. The stability of OM(PY) determined by the ~(14)C measurements of the near-neutral arable topsoils was shown to increase with the specific surface area and the concentration of exchangeable Ca. For the acidic forest topsoils (pH <5), the stability of OM(PY) was found to increase as the pH, and the concentration of C=O groups and Na-pyrophosphate soluble Mg increase.
机译：在这项研究中，我们分析了土壤矿物特征（例如，粘土浓度和矿物组成，铁和氧化铝的浓度和结晶度，比表面积和可交换阳离子浓度）对（i）有机碳（OC）含量（kg m〜（-2））和（ii）耕层和森林表层土壤的矿物质相关有机物（OM）的浓度（g kg〜（-1）），组成和稳定性。我们为这项研究选择了七种具有不同矿物特征的土壤类型。对于每种土壤类型，均从落叶林和邻近耕地的表层土壤中取样。耕地和森林遗址已经连续使用了100多年。提取代表矿物相关的OM的焦磷酸钠可溶性OM馏分（OM（PY）），分析OC和〜（14）C浓度，并通过FTIR光谱进行表征。对于森林和耕地表层土壤，OC含量和可交换的Ca之间存在线性关系。对于耕作的表土（pH 6.7-7.5），相关分析表明，随着草酸盐可溶性Fe和Al，可交换Ca和焦磷酸钠可溶性Mg和Fe浓度的增加，OC_（PY）浓度增加。由〜（14）C测量值确定的近中性耕种表层土壤的OM（PY）稳定性随比表面积和可交换Ca浓度的增加而增加。对于酸性森林表层土壤（pH <5），发现OM（PY）的稳定性随pH的增加而增加，并且C = O基团的浓度和焦磷酸钠可溶性Mg的浓度增加。

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