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    Modeling carbon stocks dynamics under fallow and cocoa agroforest systems in the shifting agricultural landscape of central Cameroon

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    Authors
    Silatsa, F.B.
    Yemefack, M.
    Ewane-Nonga, N.
    Kemga, A.
    Hanna, R.
    Date
    2017
    Language
    en
    Type
    Journal Article
    Review status
    Peer Review
    Accessibility
    Limited Access
    Metadata
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    Citation
    Silatsa, F.B., Yemefack, M., Ewane-Nonga, N., Kemga, A. & Hanna, R. (2017). Modeling carbon stock dynamics under fallow and cocoa agroforest systems in the shifting agricultural landscape of central Cameroon. Agroforestry Systems, 1-14.
    Permanent link to cite or share this item: http://hdl.handle.net/10568/77847
    DOI: https://dx.doi.org/10.1007/s10457-016-9973-4
    Abstract/Description
    With increasing concerns raised by climate change, understanding biological processes within cocoa (Theobroma cacao L.) agroforest (CAF) and fallow systems is a prerequisite for developing actions related to emission reduction in the shifting agricultural landscape of Cameroon. Carbon (C) stocks and accretion were assessed and modeled in various C components (large trees, small trees, dead wood, litter, roots, soil, and total C) of fallow and CAF systems along a 50-year chronosequence. Several functions were empirically fitted to a time series of C stocks. Large tree, soil, and total C stocks were best described by a logistic growth function while that for small trees by a rational quadratic function. The best-fitted functions explained 72–96 % of C stock accumulation over time. Two metrics describing C stock accretion were derived from these functions: the point of maximum C growth and the C growth coefficient (GC). The rate of maximum growth of total C stock was reached after 12–13 years in both fallow and CAF, with maximum GCs of 6.9 and 6.3 Mg C ha−1 year−1, respectively. Over the 50-year period, the GCs of total C stocks varied between 0.2 and 6.9 Mg C ha−1 year−1, with quick accumulation within the first decade that then slowed until it levelled off after 45 years. Over a period of about 30 years, both systems sequestered a total of ~200 Mg C ha−1. This indicates that cocoa agroforests, a main source of income for local populations, can also provide significant climate change mitigation services.
    Notes
    Published online: 03 June 2016
    CGIAR Affiliations
    Integrated Systems for the Humid Tropics; Forests
    AGROVOC Keywords
    CARBON STOCK; FALLOW SYSTEM; CLIMATE CHANGE; SHIFTING AGRICULTURE; CARBON COMPONENT; COCOA AGROFOREST; CARBON GROWTH COEFFICIENT
    Subjects
    CLIMATE CHANGE; COCOA; FORESTRY
    Countries
    CAMEROON
    Regions
    AFRICA; CENTRAL AFRICA
    Investors/sponsors
    Norwegian Agency for Development Cooperation
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    • IITA Journal Articles [1807]

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