The role of biological activity (roots,earthworms) in medium-term C dynamics in vertisol under a Digitaria decumbens (Gramineae) pasture |
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| Institution: | 1. Department of Soil and Geological Sciences, Sokoine University of Agriculture, P.O. Box 3008, Morogoro, Tanzania;2. World Agroforestry Centre (ICRAF), P.O. Box 30677, Nairobi, Kenya;3. Tanzanian Soil Information Service (TANSIS), Seliani Agricultural Research Institute, P.O. Box 6024, Arusha, Tanzania;4. Mlingano Agricultural Research Institute, P.O. Box 5088, Tanga, Tanzania;5. Department of Agricultural Engineering and Land Planning, Sokoine University of Agriculture, P.O. Box 3003, Chuo Kikuu, Morogoro, Tanzania;6. Department of Earth and Environmental Sciences, University of Leuven, Celestijnenlaan 200E, Leuven, Belgium;7. Selian Agriculture Research Institute (SARI), Arusha, Tanzania;8. Lushoto District Council, Lushoto, Tanzania;9. Department of Soil, Water and Climate, University of Minnesota-Twin Cities, 1991 Upper Buford Circle, Saint Paul, MN 55108, United States;1. Centre for Rural Development, Humboldt Universität zu Berlin, Hessische str. 1-2, 10115 Berlin, Germany;2. Department of Crops, Horticulture, and Soils, Egerton University, P.O. Box 536, Egerton, Kenya;3. Potsdam Institute of Climate Impact Research (PIK), P.O. Box 601203, 14412 Potsdam, Germany;4. Department of Sustainable Land Use and Climate Change, Faculty of Life Sciences, Humboldt Universität zu Berlin, Germany;5. World Agroforestry Centre (ICRAF), United Nations Avenue, Gigiri, P.O. Box 30677-00100 GPO, Nairobi, Kenya;6. CGIAR Research Program on Climate Change, Agriculture, and Food Security, United Nations Avenue, Gigiri, P.O. Box 30677-00100 GPO, Nairobi, Kenya;7. World Agroforestry Centre (ICRAF), Avenue des cliniques No 13, c/o INERA, Kinshasa, Congo;1. Institute of Agricultural Sciences in the Tropics (Hans-Ruthenberg-Institute), University of Hohenheim, Garbenstrasse 13, 70599 Stuttgart, Germany;2. Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, 142290 Pushchino, Russia;3. Center for Mountain Ecosystem Studies, Kunming Institute of Botany, Chinese Academy of Sciences, Heilongtan, Lanhei Road 132, 650201 Kunming, China;4. Key Laboratory of Economic Plants and Biotechnology, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;5. World Agroforestry Centre (ICRAF), China, East Asia Office c.o. Kunming Institute of Botany, Heilongtan, Lanhei Road No. 132, Kunming 650201, China |
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| Abstract: | The natural abundance of 13C was used to estimate the turnover of the soil organic matter in a vertisol re-grassed with Digitaria decumbens (C4 plant) following intensive market gardening (C3 plants). In addition, the experimental design allowed us to determine the respective roles of roots and earthworms (Polypheretima elongata) in soil C stock restoration in D. decumbens pasture.The C stock increased from 31 to 37 Mg C ha?1 in 5 years and the δ13C increased from ?18.1‰ in market gardening soil to ?15.5‰ in the 5-year-old pasture soil in the upper 20 cm. Below the 20 cm soil layer, the C stock and the δ13C did not change significantly in 5 years. The net gain of 6 Mg C ha?1 was the balance of a loss of 5 Mg C ha?1 derived from market gardening and a gain of 11 Mg C ha?1 derived from D. decumbens. Effects of earthworms on the C dynamics were not discernible. |
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