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Conservative N cycling despite high atmospheric deposition in early successional African tropical lowland forests

Isaac Ahanamungu Makelele (UGent) , Marijn Bauters (UGent) , Kris Verheyen (UGent) , Matti Barthel, Johan Six, Tobias Rütting, Samuel Bodé (UGent) , Landry Cizungu Ntaboba, Basile Mujinya Bazirake, Faustin Boyemba Bosela, et al.
(2022) PLANT AND SOIL. 477(1-2). p.743-758
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Abstract
Background Across the tropics, the share of secondary versus primary forests is strongly increasing. The high rate of biomass accumulation during this secondary succession relies on the availability of essential nutrients, such as nitrogen (N). Nitrogen primarily limits many young secondary forests in the tropics. However, recent studies have shown that forests of the Congo basin are subject to high inputs of atmospheric N deposition, potentially alleviating this N limitation in early succession. Methods To address this hypothesis, we assessed the N status along a successional gradient of secondary forests in the Congo basin. In a set-up of 18 plots implemented along six successional stages, we quantified year-round N deposition, N leaching, N2O emission and the N flux of litterfall and fine root assimilation. Additionally, we determined the N content and C:N stoichiometry for canopy leaves, fine roots, and litter, as well as delta N-15 of canopy leaves. Results We confirmed that these forests receive high amounts of atmospheric N deposition, with an increasing deposition as forest succession proceeds. Additionally, we noted lower C:N ratios, and higher N leaching losses, N2O emission, and foliar delta N-15 in older secondary forest (60 years). In contrast, higher foliar, litter and root C:N ratios, and lower foliar delta N-15, N leaching, and N2O emission in young (< 20 years) secondary forest were observed. Conclusions Altogether, we show that despite high N deposition, this early forest succession still shows conservative N cycling characteristics, which are likely indicating N limitation early on in secondary forest succession. As secondary succession advances, the N cycle gradually becomes more open.
Keywords
Congo basin, Nitrogen cycle, Secondary succession, Tropical forests biogeochemistry, RAIN-FOREST, ISOTOPIC COMPOSITION, NITROGEN DEPOSITION, SOIL, CARBON, INTERCEPTION, THROUGHFALL, BASIN, EMISSIONS, FIXATION

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MLA
Ahanamungu Makelele, Isaac, et al. “Conservative N Cycling despite High Atmospheric Deposition in Early Successional African Tropical Lowland Forests.” PLANT AND SOIL, vol. 477, no. 1–2, 2022, pp. 743–58, doi:10.1007/s11104-022-05473-7.
APA
Ahanamungu Makelele, I., Bauters, M., Verheyen, K., Barthel, M., Six, J., Rütting, T., … Boeckx, P. (2022). Conservative N cycling despite high atmospheric deposition in early successional African tropical lowland forests. PLANT AND SOIL, 477(1–2), 743–758. https://doi.org/10.1007/s11104-022-05473-7
Chicago author-date
Ahanamungu Makelele, Isaac, Marijn Bauters, Kris Verheyen, Matti Barthel, Johan Six, Tobias Rütting, Samuel Bodé, et al. 2022. “Conservative N Cycling despite High Atmospheric Deposition in Early Successional African Tropical Lowland Forests.” PLANT AND SOIL 477 (1–2): 743–58. https://doi.org/10.1007/s11104-022-05473-7.
Chicago author-date (all authors)
Ahanamungu Makelele, Isaac, Marijn Bauters, Kris Verheyen, Matti Barthel, Johan Six, Tobias Rütting, Samuel Bodé, Landry Cizungu Ntaboba, Basile Mujinya Bazirake, Faustin Boyemba Bosela, Fabrice Kimbesa, Corneille Ewango, and Pascal Boeckx. 2022. “Conservative N Cycling despite High Atmospheric Deposition in Early Successional African Tropical Lowland Forests.” PLANT AND SOIL 477 (1–2): 743–758. doi:10.1007/s11104-022-05473-7.
Vancouver
1.
Ahanamungu Makelele I, Bauters M, Verheyen K, Barthel M, Six J, Rütting T, et al. Conservative N cycling despite high atmospheric deposition in early successional African tropical lowland forests. PLANT AND SOIL. 2022;477(1–2):743–58.
IEEE
[1]
I. Ahanamungu Makelele et al., “Conservative N cycling despite high atmospheric deposition in early successional African tropical lowland forests,” PLANT AND SOIL, vol. 477, no. 1–2, pp. 743–758, 2022.
@article{8763031,
  abstract     = {{Background Across the tropics, the share of secondary versus primary forests is strongly increasing. The high rate of biomass accumulation during this secondary succession relies on the availability of essential nutrients, such as nitrogen (N). Nitrogen primarily limits many young secondary forests in the tropics. However, recent studies have shown that forests of the Congo basin are subject to high inputs of atmospheric N deposition, potentially alleviating this N limitation in early succession. Methods To address this hypothesis, we assessed the N status along a successional gradient of secondary forests in the Congo basin. In a set-up of 18 plots implemented along six successional stages, we quantified year-round N deposition, N leaching, N2O emission and the N flux of litterfall and fine root assimilation. Additionally, we determined the N content and C:N stoichiometry for canopy leaves, fine roots, and litter, as well as delta N-15 of canopy leaves. Results We confirmed that these forests receive high amounts of atmospheric N deposition, with an increasing deposition as forest succession proceeds. Additionally, we noted lower C:N ratios, and higher N leaching losses, N2O emission, and foliar delta N-15 in older secondary forest (60 years). In contrast, higher foliar, litter and root C:N ratios, and lower foliar delta N-15, N leaching, and N2O emission in young (< 20 years) secondary forest were observed. Conclusions Altogether, we show that despite high N deposition, this early forest succession still shows conservative N cycling characteristics, which are likely indicating N limitation early on in secondary forest succession. As secondary succession advances, the N cycle gradually becomes more open.}},
  author       = {{Ahanamungu Makelele, Isaac and Bauters, Marijn and Verheyen, Kris and Barthel, Matti and Six, Johan and Rütting, Tobias and Bodé, Samuel and Cizungu Ntaboba, Landry and Mujinya Bazirake, Basile and Boyemba Bosela, Faustin and Kimbesa, Fabrice and Ewango, Corneille and Boeckx, Pascal}},
  issn         = {{0032-079X}},
  journal      = {{PLANT AND SOIL}},
  keywords     = {{Congo basin,Nitrogen cycle,Secondary succession,Tropical forests biogeochemistry,RAIN-FOREST,ISOTOPIC COMPOSITION,NITROGEN DEPOSITION,SOIL,CARBON,INTERCEPTION,THROUGHFALL,BASIN,EMISSIONS,FIXATION}},
  language     = {{eng}},
  number       = {{1-2}},
  pages        = {{743--758}},
  title        = {{Conservative N cycling despite high atmospheric deposition in early successional African tropical lowland forests}},
  url          = {{http://doi.org/10.1007/s11104-022-05473-7}},
  volume       = {{477}},
  year         = {{2022}},
}
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