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    Organic Matter Turnover in Light Fraction and Whole Soil Under Silvopastoral Land Use in Semiarid Northeast Brazil

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    Author
    Wick, Barbara
    Tiessen, Holm
    Issue Date
    2008-05-01
    Keywords
    agroforestry
    caatinga
    13C natural abundance
    indigenous trees
    islands of fertility
    pastures
    
    Metadata
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    Citation
    Wick, B., & Tiessen, H. (2008). Organic matter turnover in light fraction and whole soil under silvopastoral land use in semiarid northeast Brazil. Rangeland Ecology & Management, 61(3), 275-283.
    Publisher
    Society for Range Management
    Journal
    Rangeland Ecology & Management
    URI
    http://hdl.handle.net/10150/642952
    DOI
    10.2111/07-038.1
    Additional Links
    https://rangelands.org/
    Abstract
    Trees in silvopastoral systems can accumulate carbon (C) and nutrients under their canopies. Most studies measure only net changes in organic matter and nutrients without evaluating turnover of soil organic matter. Here, the change in vegetation cover from caatinga, a semideciduous thorn forest (principally C3 metabolism) to buffel grass (Cenchrus ciliaris L.) pasture (C4 metabolism) was used to quantify in situ input and turnover rates of organic carbon 14 yr after land-use changes. The accretion of C under new pasture and loss of original caatinga C was studied for whole soil (WS) and light fraction (LF). The effects of two tree species preserved during selective clearing and one species planted after complete clearing of caatinga were evaluated. All trees prevented organic matter mineralization that occurred in surrounding cleared pasture. The C mineralization under pasture was twice as high (66% loss) in LF as in WS (34% loss) over 14 yr. The C4-C was similar under and outside the remnant and planted tree canopies, i.e., the input of new C4-C did not compensate for the loss of old C3-C that occurred following caatinga clearing and pasture establishment. The organic matter in this tropical, semiarid region mineralized rapidly with C half lives between 9 and 16 yr for LF and between 11 and 28 yr for WS. The 13C data indicate that elevated C contents under preserved (WS and LF) and planted (LF) trees, relative to the pasture outside the tree canopies, largely represent C3-C inherited from the caatinga. In this silvopastoral system, derived from land-use changes from dry forest, the islands of fertility and organic matter under the trees were not built up and represent preserved, rather than new, C inputs. 
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/07-038.1
    Scopus Count
    Collections
    Rangeland Ecology & Management, Volume 61, Number 3 (May 2008)

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