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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
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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
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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
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Journal Article
The influence of mineral characteristics on organic matter content, composition, and stability of topsoils under long-term arable and forest land use
2012
Overview
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 100 years. Na‐pyrophosphate soluble OM fractions (OM(PY)), representing mineral‐associated OM, were extracted, analyzed for OC and 14C 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 OCPY 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 14C 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. Key Points Land use–derived carbon accumulation is site specific Organic carbon stocks increase with increasing stocks of exchangeable Ca Na4P2O7‐extractable organic matter is more stable in arable than in forest soils
Publisher
Blackwell Publishing Ltd,American Geophysical Union
