Conversion of lowland tropical forests to tree cash crop plantations loses up to one-half of stored soil organic carbon
| Autor: | Oliver van Straaten, Eloy Cuellar, Katrin Wolf, Marife D. Corre, Edzo Veldkamp, Martin Tchienkoua, Robin Matthews |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Crops
Agricultural Nitrogen Theobroma Cash crop Land-use change Forests Elaeis guineensis Statistics Nonparametric Trees Soil Forestal Tropical climate Land use land-use change and forestry Biomass Organic Chemicals Ecosystem 2. Zero hunger Tropical Climate Topsoil Cacao Multidisciplinary Geography biology Agroforestry Soil organic matter Forestry Soil carbon Biological Sciences 15. Life on land biology.organism_classification Carbon 13. Climate action Oil palm Environmental science Rubber |
| Zdroj: | Instituto Nacional de Innovación Agraria INIA-Institucional instacron:INIA Repositorio Institucional-INIA |
| Popis: | 5 Páginas Tropical deforestation for the establishment of tree cash crop plantations causes significant alterations to soil organic carbon (SOC) dynamics. Despite this recognition, the current Intergovernmental Panel on Climate Change (IPCC) tier 1 method has a SOC change factor of 1 (no SOC loss) for conversion of forests to perennial tree crops, because of scarcity of SOC data. In this pantropic study, conducted in active deforestation regions of Indonesia, Cameroon, and Peru, we quantified the impact of forest conversion to oil palm (Elaeis guineensis), rubber (Hevea brasiliensis), and cacao (Theobroma cacao) agroforestry plantations on SOC stocks within 3-m depth in deeply weathered mineral soils. We also investigated the underlying biophysical controls regulating SOC stock changes. Using a space-for-time substitution approach, we compared SOC stocks from paired forests (n = 32) and adjacent plantations (n = 54). Our study showed that deforestation for tree plantations decreased SOC stocks by up to 50%. The key variable that predicted SOC changes across plantations was the amount of SOC present in the forest before conversion—the higher the initial SOC, the higher the loss. Decreases in SOC stocks were most pronounced in the topsoil, although older plantations showed considerable SOC losses below 1-m depth. Our results suggest that (i) the IPCC tier 1 method should be revised from its current SOC change factor of 1 to 0.6 ± 0.1 for oil palm and cacao agroforestry plantations and 0.8 ± 0.3 for rubber plantations in the humid tropics; and (ii) land use management policies should protect natural forests on carbon-rich mineral soils to minimize SOC losses. Study Description. Results. Discussion. Methods. References |
| Databáze: | OpenAIRE |
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