期刊
REGIONAL ENVIRONMENTAL CHANGE
卷 16, 期 7, 页码 2059-2069出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10113-016-0936-0
关键词
C3 contribution; Deep soil C; Native forest; Old pasture; Mixed-grass pasture
资金
- French Ministry of Research
- CIRAD
- INRA
- CNES
- European regional development fund (ERDF/FEDER)
- Investissement d'Avenir Grant [ANR-10-LABX-0025]
- European project Animal Change [FP7 KKBE 2010-2014]
- European Research Council [ERC-2013-SyG-610028 IMBALANCE-P]
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.
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