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Leaky nitrogen cycle in pristine African montane rainforest soil

(2015) GLOBAL BIOGEOCHEMICAL CYCLES. 29(10). p.1754-1762
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Abstract
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 N-15 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.
Keywords
TROPICAL FOREST, OLD-GROWTH FORESTS, AMMONIUM OXIDATION, CARBON, LOSSES, N-15, TRANSFORMATIONS, ECOSYSTEMS, STORAGE, CLIMATE

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Citation

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Chicago
Rutting, Tobias, Cizungu Ntaboba Landry, Dries Roobroeck, Marijn Bauters, Dries Huygens, and Pascal Boeckx. 2015. “Leaky Nitrogen Cycle in Pristine African Montane Rainforest Soil.” Global Biogeochemical Cycles 29 (10): 1754–1762.
APA
Rutting, T., Landry, C. N., 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.
Vancouver
1.
Rutting T, Landry CN, Roobroeck D, Bauters M, Huygens D, Boeckx P. Leaky nitrogen cycle in pristine African montane rainforest soil. GLOBAL BIOGEOCHEMICAL CYCLES. 2015;29(10):1754–62.
MLA
Rutting, Tobias, Cizungu Ntaboba Landry, Dries Roobroeck, et al. “Leaky Nitrogen Cycle in Pristine African Montane Rainforest Soil.” GLOBAL BIOGEOCHEMICAL CYCLES 29.10 (2015): 1754–1762. Print.
@article{8030038,
  abstract     = {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 N-15 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.},
  author       = {Rutting, Tobias and Landry, Cizungu Ntaboba and Roobroeck, Dries and Bauters, Marijn and Huygens, Dries and Boeckx, Pascal},
  issn         = {0886-6236},
  journal      = {GLOBAL BIOGEOCHEMICAL CYCLES},
  keyword      = {TROPICAL FOREST,OLD-GROWTH FORESTS,AMMONIUM OXIDATION,CARBON,LOSSES,N-15,TRANSFORMATIONS,ECOSYSTEMS,STORAGE,CLIMATE},
  language     = {eng},
  number       = {10},
  pages        = {1754--1762},
  title        = {Leaky nitrogen cycle in pristine African montane rainforest soil},
  url          = {http://dx.doi.org/10.1002/2015GB005144},
  volume       = {29},
  year         = {2015},
}

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