| Autor: |
Jeroen, Meersmans, De Ridder, Fedor, Canters, Frank, Van Molle, Marc |
| Přispěvatelé: |
Geography, Cartography and Geographical Information Science, Electricity |
| Jazyk: |
angličtina |
| Rok vydání: |
2007 |
| Předmět: |
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| Popis: |
Research that has been conducted over the last decades suspects that the missing sink of atmospheric CO2 is situated in the soils. Nevertheless, the CO2 interaction between soil and atmosphere is the most unknown part of the global C cycle. Spatial and temporal studies of soil organic carbon (SOC) are essential for a better understanding of this interaction and sustainable management of the soil in the light of global climate change. In this study, to estimate the amount of SOC by depth a quantitative model was constructed. The output provides, information on the stability of the stocked carbon and answers to the question: Is SOC mainly stocked in the deeper layers (more stable) or either near the surface (less stable)? The SOC amount remains constant until the tillage depth (td) is reached. Deeper on, SOC shows an exponential decline by depth. In addition, the model, which is based on SOC values, also estimates the depth of tillage (td). As the model was applied on SOC data from the 1960 (database Aardewerk) and recent achieved data (2006) a comparison in time of the modelled SOC depth distribution is made. This temporal analysis was conducted under different land uses, texture and drainage conditions. Changes in SOC distribution with depth in time within same land use - soil type groups helps to identify the effect of land management practices on SOC status of the soils. The results show an increase of tillage depth and a decreased of SOC content in topsoil in time under cropland. Furthermore, drainage status of the soil seems to have major impact on SOC distribution. A remarkable decrease of SOC in time near the surface under wet to extreme wet pasture soils was observed. This can be attributed to intensive draining of soil for cultivation purpose during last decades. Whereas, an increase of SOC in time under dry pasture soils can be the result of high rates of manure application. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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