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Pàgina inicial > Articles > Articles publicats > Soil carbon stocks after conversion of Amazonian tropical forest to grazed pasture : |
Data: | 2016 |
Resum: | Recent studies suggest that carbon (C) is stored in the topsoil of pastures established after deforestation. However, little is known about the long-term capacity of tropical pastures to sequester C in different soil layers after deforestation. Deep soil layers are generally not taken into consideration or are underestimated when C storage is calculated. Here we show that in French Guiana, the C stored in the deep soil layers contributes significantly to C stocks down to a depth of 100 cm and that C is sequestered in recalcitrant soil organic matter in the soil below a depth of 20 cm. The contribution of the 50-100 cm soil layer increased from 22 to 31 % with the age of the pasture. We show that long-term C sequestration in C4 tropical pastures is linked to the development of C3 species (legumes and shrubs), which increase both inputs of N into the ecosystem and the C:N ratio of soil organic matter. The deep soil under old pastures contained more C3 carbon than the native forest. If C sequestration in the deep soil is taken into account, our results suggest that the soil C stock in pastures in Amazonia would be higher with sustainable pasture management, in particular by promoting the development of legumes already in place and by introducing new species. |
Ajuts: | European Commission 266018 European Commission 610028 |
Nota: | Altres ajuts: these projects are co-funded by European regional development fund (ERDF / FEDER, 2007-2013). |
Drets: | Tots els drets reservats. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | C3 contribution ; Deep soil C ; Native forest ; Old pasture ; Mixed-grass pasture |
Publicat a: | Regional environmental change, Vo. 16, Issue 7, (October 2016) , p. 2059-2069, ISSN 1436-378X |
Post-print 31 p, 2.5 MB |