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dc.contributor.authorWick, Barbara
dc.contributor.authorTiessen, Holm
dc.date.accessioned2020-09-05T07:11:40Z
dc.date.available2020-09-05T07:11:40Z
dc.date.issued2008-05-01
dc.identifier.citationWick, 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.
dc.identifier.issn0022-409X
dc.identifier.doi10.2111/07-038.1
dc.identifier.urihttp://hdl.handle.net/10150/642952
dc.description.abstractTrees 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. 
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectagroforestry
dc.subjectcaatinga
dc.subject13C natural abundance
dc.subjectindigenous trees
dc.subjectislands of fertility
dc.subjectpastures
dc.titleOrganic Matter Turnover in Light Fraction and Whole Soil Under Silvopastoral Land Use in Semiarid Northeast Brazil
dc.typetext
dc.typeArticle
dc.identifier.journalRangeland Ecology & Management
dc.description.collectioninformationThe Rangeland Ecology & Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume61
dc.source.issue3
dc.source.beginpage275-283
refterms.dateFOA2020-09-05T07:11:40Z


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