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Redistribution of Soil Organic Carbon Triggered by Erosion at Field Scale Under Subhumid Climate,Hungary

Pedosphere 2016年第5期26卷 652-665页

作者： Zoltan SZALAI Judit SZABO Jozsef KOVACS Erzsebet MESZAROS Gaspar ALBERT csaba centeri Boglarka SZABO Balazs MADARASZ Dora ZACHARY Gergely JAKAB Geographical Institute Research Centre for Astronomy and Earth Sciences Hungarian Academy of SciencesBudapest 1112(Hungary) Department of Environmental and Landscape Geography Eotvos Lordnd UniversityBudapest 1117(Hungary) Department of Applied and Environmental Geology Eotvos Lordnd UniversityBudapest 1117(Hungary) Department of Cartography and Geoinformatics Eotvos Lordnd UniversityBudapest 1117(Hungary) Department of Nature Conservation and Landscape Ecology Szent Istvdn UniversityGodollo 2100(Hungary)

Soil organic carbon(SOC) has primary importance in terms of soil physics, soil fertility and even of climate change control. One hundred soil samples were taken from an intensively cultivated Cambisol to quantify SOC redistribution triggered by soil erosion under a subhumid climate, by the simultaneous application of diffuse reflectance(240–1 900 nm) and traditional physico-chemical *** representative sample points were collected from the solum along the slopes at the depth of 20–300 cm with a mean SOC content of 12 g kg^(-1). Hierarchical cluster analyses were performed based on the determined SOC results. The spatial pattern of the groups created were similar, and even though the classifications were not the same, diffuse reflectance had proven to be a suitable method for soil/sediment classification even within a given arable field. Both organic and inorganic carbon distributions were found to be a proper tool for estimations of past soil erosion processes. The SOC enrichment was found on two sedimentary spots with different geomorphological positions. Soil organic matter composition also differed between the two spots due to selective deposition of the delivered organic matter. The components with low-molecular-weight reached the bottom of the slope where they could leach into the profile, while the more polymerised organic matter compositions were delivered and deposited even before on a higher segment of the slope in an aggregated form. This spatial difference appeared below the uppermost tilled soil layer as well, referring the lower efficiency of conventional ploughing tillage in soil spatial homogenisation.

关键词：土壤侵蚀过程土壤有机碳湿润气候再分配农田尺度匈牙利土壤/沉积物有机质组成

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