Changes in organic carbon concentration and organic matter compound of erosion-delivered soil aggregates

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• 作者：Gergely Jakab ; Judit Szabó ; Zoltán Szalai…
• 关键词：Selective erosion ; Conventional tillage ; Soil organic carbon redistribution ; Subhumid climate ; Rainfall simulation ; Cambisol
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：75
• 期：2
• 全文大小：1,110 KB
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• 作者单位：Gergely Jakab (1)
  Judit Szabó (2)
  Zoltán Szalai (1) (2)
  Erzsébet Mészáros (1)
  Balázs Madarász (1)
  Csaba Centeri (3)
  Boglárka Szabó (3)
  Tibor Németh (4)
  Péter Sipos (4)
  
  1. Geographical Institute RCAES, HAS, Budaörsi út 45, 1112, Budapest, Hungary
  2. Department of Environmental and Landscape Geography, Eötvös Loránd University, Pázmány Péter sétány 1/C, 1117, Budapest, Hungary
  3. Department of Nature Conservation and Landscape Ecology, Szent István University, Páter Károly u. 1., 2100, Gödöllő, Hungary
  4. Institute for Geochemical Research RCAES, HAS, Budaörsi út 45, 1112, Budapest, Hungary
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Soil organic carbon (SOC) is a key property for both fertility and carbon level control in the atmosphere. SOC changes in soils are ruled by tillage and erosion. Initial SOC erosion was investigated using a laboratory rainfall simulator. Six precipitation events were modelled on cultivated, bare Cambisol monolith with various slope steepness and surface roughness under a constant intensity of 80 mm h−1. The total amount of soil loss was divided into four aggregate size classes (<0.05, 0.05–0.25, 0.25–1.00, >1.00 mm). Altogether, 72 sediment and 16 in situ samples were analysed. The results show a loss of SOC concentration that increased at all aggregate sizes, the highest (~200 %) found in the smallest grain size, while conversely nitrogen concentration decreased in the 250–1000 μm class. Consequently, soil organic matter (SOM) compounds underwent changes during the initial erosion processes in soil losses of all aggregate sizes. The detached SOM was less polymerised and had more aromatic character compared to that of the in situ soil in all aggregate size classes. The type of SOM enrichment found through the soil loss in this study is a result of two parallel processes within initial erosion phenomenon: (I) chemical degradation of the most labile SOM components and (II) mineralogical changes in the smallest aggregate class (<0.05 mm) that results in a considerable amount of quartz leaving the aggregates and remaining on the surface. The results suggest that tillage operations regarding stability of the smallest aggregates have particular importance in SOC conservation. Keywords Selective erosion Conventional tillage Soil organic carbon redistribution Subhumid climate Rainfall simulation Cambisol