Leaky nitrogen cycle in pristine African montane rainforest soil
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 locatio...
| Autores principales: | , , , , , |
|---|---|
| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Wiley
2015
|
| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/76290 |
| _version_ | 1855523305017049088 |
|---|---|
| author | Ruttink, T. Cizungu-Ntaboba, L. Roobroeck, D. Bauters, M. Huygens, D. Boeckx, P. |
| author_browse | Bauters, M. Boeckx, P. Cizungu-Ntaboba, L. Huygens, D. Roobroeck, D. Ruttink, T. |
| author_facet | Ruttink, T. Cizungu-Ntaboba, L. Roobroeck, D. Bauters, M. Huygens, D. Boeckx, P. |
| author_sort | Ruttink, T. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | 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. |
| format | Journal Article |
| id | CGSpace76290 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Wiley |
| publisherStr | Wiley |
| record_format | dspace |
| spelling | CGSpace762902024-05-01T08:16:57Z Leaky nitrogen cycle in pristine African montane rainforest soil Ruttink, T. Cizungu-Ntaboba, L. Roobroeck, D. Bauters, M. Huygens, D. Boeckx, P. tropical forests nitrogen cycle mineralization 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. 2015-10 2016-07-27T12:46:56Z 2016-07-27T12:46:56Z Journal Article https://hdl.handle.net/10568/76290 en Limited Access Wiley Rütting, 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. |
| spellingShingle | tropical forests nitrogen cycle mineralization Ruttink, T. Cizungu-Ntaboba, L. Roobroeck, D. Bauters, M. Huygens, D. Boeckx, P. Leaky nitrogen cycle in pristine African montane rainforest soil |
| title | Leaky nitrogen cycle in pristine African montane rainforest soil |
| title_full | Leaky nitrogen cycle in pristine African montane rainforest soil |
| title_fullStr | Leaky nitrogen cycle in pristine African montane rainforest soil |
| title_full_unstemmed | Leaky nitrogen cycle in pristine African montane rainforest soil |
| title_short | Leaky nitrogen cycle in pristine African montane rainforest soil |
| title_sort | leaky nitrogen cycle in pristine african montane rainforest soil |
| topic | tropical forests nitrogen cycle mineralization |
| url | https://hdl.handle.net/10568/76290 |
| work_keys_str_mv | AT ruttinkt leakynitrogencycleinpristineafricanmontanerainforestsoil AT cizunguntabobal leakynitrogencycleinpristineafricanmontanerainforestsoil AT roobroeckd leakynitrogencycleinpristineafricanmontanerainforestsoil AT bautersm leakynitrogencycleinpristineafricanmontanerainforestsoil AT huygensd leakynitrogencycleinpristineafricanmontanerainforestsoil AT boeckxp leakynitrogencycleinpristineafricanmontanerainforestsoil |