Idioma:

Long-term soil carbon loss and accumulation in a catchment following the conversion of forest to arable land in northern Laos

Huon, Sylvain ; de Rouw, Anneke ; Bonté, Philippe ; Robain, Henri ; Valentin, Christian ; Lefèvre, Irène ; Girardin, Cyril ; Le Troquer, Yann ; Podwojewski, Pascal ; Sengtaheuanghoung, Oloth

Agriculture, ecosystems & environment, 2013-04, Vol.169, p.43-57 [Periódico revisado por pares]

Oxford: Elsevier B.V

Texto completo disponível

Citações Citado por

Enviar para

Título:
Long-term soil carbon loss and accumulation in a catchment following the conversion of forest to arable land in northern Laos
Autor: Huon, Sylvain ; de Rouw, Anneke ; Bonté, Philippe ; Robain, Henri ; Valentin, Christian ; Lefèvre, Irène ; Girardin, Cyril ; Le Troquer, Yann ; Podwojewski, Pascal ; Sengtaheuanghoung, Oloth
Assuntos: 137Cs ; 210Pbxs ; Agricultural sciences ; Agronomy. Soil science and plant productions ; Biological and medical sciences ; C3–C4 plants ; Carbon ; Catchments ; Clearing ; Continental interfaces, environment ; crop rotation ; Cropping systems. Cultivation. Soil tillage ; Cultivation history ; deforestation ; Earth Sciences ; electrical resistance ; Electrical resistivity tomography ; Environmental Sciences ; Estimates ; farmers ; forest soils ; Forestry ; Forests ; Fundamental and applied biological sciences. Psychology ; General agroecology ; General agroecology. Agricultural and farming systems. Agricultural development. Rural area planning. Landscaping ; General agronomy. Plant production ; Generalities. Agricultural and farming systems. Agricultural development ; Generalities. Cropping systems and patterns ; Geomorphology ; highlands ; Hydrology ; inventories ; land use change ; landscapes ; Life Sciences ; mineralization ; Oryza sativa ; rice ; Sciences of the Universe ; sediments ; shifting cultivation ; Slash-and-burn ; Slopes ; Soil (material) ; Soil erosion, conservation, land management and development ; soil organic carbon ; Soil science ; Soil study ; Swamp deposits ; Swamps ; tillage ; tomography ; watersheds ; δ13C
É parte de: Agriculture, ecosystems & environment, 2013-04, Vol.169, p.43-57
Notas: http://dx.doi.org/10.1016/j.agee.2013.02.007
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: •In Northern Laos high forest was converted to arable land by shifting cultivation.•Long-term soil carbon depletion since deforestation started in the early 1960s.•First forest clearing triggered high soil carbon loss along catchment's slopes.•Relocation of 137Cs is linked to topography and cultivation cycles.•Mineralization was likely the main cause for soil carbon depletion in the catchment. Quantifying the magnitude of soil organic carbon loss linked to the conversion of forest to arable land in tropical environments requires long-term estimates of soil redistribution trends within the catchment. In order to assess the cumulative soil carbon loss that occurred since deforestation and cropping started in 1967, a multidisciplinary study was carried out in a small catchment (67ha) with a swamp area in its middle part, characterized by steep slopes under shifting cultivation of upland rice, typical for northern Laos's landscapes. Using 137Cs and total organic carbon (TOC) inventories, it was possible to estimate a soil TOC depletion rate of 0.039kgCm−2yr−1 in 42 years (1963–2005), corresponding to ca. 21% of its initial content in the top 10cm. Because farmers preferred clearing more fertile soils located downhill and leave forest on poorer soils on the crests, the redistribution of 137Cs and TOC along slopes of the catchment was mainly controlled by the topographic position of soils and the cultivation frequency. Estimates of soil TOC accumulation in wetlands with δ13C measurements and sediment volumes by electrical resistivity tomography showed that TOC accumulation rates were linked to land use change since the 1960s with three successive periods corresponding to undisturbed forest, deforestation-first rice crop and rice-fallow rotations. Forest clearing triggered a higher soil TOC delivery to the swamp (19.6±5.5kgCha−1yr−1) over 8 years (1967–1975) than the former undisturbed forest (8.5±1.8kgCha−1yr−1) and crop-fallow rotations over 30 years (1975–2005, 6.4±4.8kgCha−1yr−1). Due to the small size of the area covered by the swamp, only a limited fraction of eroded soil organic carbon (ca. 7wt.%) was stored in wetlands of the catchment. Mineralization apparently played a key role for soil TOC depletion since first forest clearing.
Editor: Oxford: Elsevier B.V
Idioma: Inglês

Links

Voltar para lista de resultados

Anterior Resultado 10 Avançar Ir para próxima página

Realização: Logos de Redes Sociais:

Long-term soil carbon loss and accumulation in a catchment following the conversion of forest to arable land in northern Laos

Huon, Sylvain ; de Rouw, Anneke ; Bonté, Philippe ; Robain, Henri ; Valentin, Christian ; Lefèvre, Irène ; Girardin, Cyril ; Le Troquer, Yann ; Podwojewski, Pascal ; Sengtaheuanghoung, Oloth

Oxford: Elsevier B.V

Buscando em bases de dados remotas. Favor aguardar.