DOI: 10.1002/2015GB005144
Scopus记录号: 2-s2.0-84946567694
论文题名: Leaky nitrogen cycle in pristine African montane rainforest soil
作者: Rütting T ; , Cizungu Ntaboba L ; , Roobroeck D ; , Bauters M ; , Huygens D ; , Boeckx P
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 10 起始页码: 1754
结束页码: 1762
语种: 英语
英文关键词: biogeochemistry
; nitrogen cycle
; tropical forest
Scopus关键词: ammonium
; biogeochemistry
; forest soil
; humid environment
; mineralization
; montane forest
; nitrate
; nitrogen cycle
; nitrogen isotope
; pristine environment
; rainforest
; tropical forest
; Nyungwe National Park
; Rwanda
; Rwanda
; South Province
英文摘要: Many 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. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77916
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Faculté d'Agronomie, Université Catholique de Bukavu, Bukavu, Congo; Isotope Bioscience Laboratory - ISOFYS, Ghent University, Gent, Belgium; International Institute for Tropical Agriculture, Nairobi, Kenya; Instituto Multidisciplinario de Biología Vegetal e IMBIV, Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Cõrdoba, Cõrdoba, Argentina
Recommended Citation:
Rütting T,, Cizungu Ntaboba L,, Roobroeck D,et al. Leaky nitrogen cycle in pristine African montane rainforest soil[J]. Global Biogeochemical Cycles,2015-01-01,29(10)