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dc.contributor.authorRutting, T.
dc.contributor.authorCizungu-Ntaboba, L.
dc.contributor.authorRoobroeck, D.
dc.contributor.authorBauters, M.
dc.contributor.authorHuygens, D.
dc.contributor.authorBoeckx, P.
dc.identifier.citationRütting, T., Cizungu Ntaboba, L., Roobroeck, D., Bauters, M., Huygens, D. & Boeckx, P. (2015). Leaky nitrogen cycle in pristine African montane rainforest soil. Global Biogeochemical Cycles, 29(10), 1754-1762.
dc.description.abstractMany pristine humid tropical forests show simultaneously high nitrogen (N) richness and sustained loss of bioavailable N forms. To better understand this apparent upregulation of the N cycle in tropical forests, process-based understanding of soil N transformations, in geographically diverse locations, remains paramount. Field-based evidence is limited and entirely lacking for humid tropical forests on the African continent. This study aimed at filling both knowledge gaps by monitoring N losses and by conducting an in situ 15N labeling experiment in the Nyungwe tropical montane forest in Rwanda. Here we show that this tropical forest shows high nitrate (NO3−) leaching losses, confirming findings from other parts of the world. Gross N transformation rates point to an open soil N cycle with mineralized N nitrified rather than retained via immobilization; gross immobilization of NH4+ and NO3− combined accounted for 37% of gross mineralization, and plant N uptake is dominated by ammonium (NH4+). This study provided new process understanding of soil N cycling in humid tropical forests and added geographically independent evidence that humid tropical forests are characterized by soil N dynamics and N inputs sustaining bioavailable N loss.
dc.subjectTropical Forests
dc.subjectNitrogen Cycle
dc.titleLeaky nitrogen cycle in pristine African montane rainforest soil
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpIntegrated Systems for the Humid Tropics
cg.contributor.affiliationUniversity of Gothenburg
cg.contributor.affiliationUniversité Catholique de Bukavu
cg.contributor.affiliationGhent University
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.coverage.regionCentral Africa
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.journalGlobal Biogeochemical Cycles
cg.howpublishedFormally Published
cg.accessibilitystatusLimited Access

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