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Substantial organic and particulate nitrogen and phosphorus export from geomorphologically stable African tropical forest landscapes

Simon Baumgartner, Marijn Bauters (UGent) , Travis W. Drake, Matti Barthel, Serge Alebadwa, Nadine Bahizire, Basile Mujinya Bazirake, Johan Six, Pascal Boeckx (UGent) and Kristof Van Oost
(2023) ECOSYSTEMS. 26(3). p.553-567
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Abstract
Aquatic losses of nutrients are important loss vectors in the nutrient budgets of tropical forests. Traditionally, research has focused mainly on losses of inorganic nutrient forms, whereas the potential contribution of organic and particulate losses to the total nutrient export budget is much less constrained. In this study, we quantified full aquatic nitrogen (N) and phosphorus (P) exports, including inorganic, organic and particulate forms, from a moist tropical lowland forest and a semi-dry Miombo woodland forest within the Congo Basin. While particulate organic N (PON) was the highest N loss vector in the lowland stream (3.34 kg N ha(-1) y(-1); 44% of TN), dissolved organic N (DON) dominated the export in the Miombo stream (1.41 kg N ha(-1) y(.-1); 47% of TN). Aquatic P export was dominated by dissolved organic P (DOP) in both streams, with yields of 0.29 kg P ha(-1) y(-1) (65% of TP) in the lowland and 0.24 kg P ha(-1) y(-1) (69% of TP) in the Miombo. Storm events were driving those losses, exporting disproportionally high N and P loads during short periods of stormflow conditions (32% and 47% of TN and 20% and 40% of TP in the lowland and Miombo, respectively). Our results highlight the need to take particulate and organic forms into account as important loss vectors in the nutrient balance of tropical forests. This finding is of particular importance considering the projected increasing rainfall intensities in many tropical regions which might exacerbate the export of these nutrient forms in the near future.
Keywords
biogeochemistry, tropical forests, Congo Basin, particulate organic nitrogen, particulate phosphorus, storm events, NUTRIENT LOSSES, SOIL-NITROGEN, AMAZON RIVER, CARBON, FLUXES, AVAILABILITY, WATERSHEDS, CATCHMENT, EMISSIONS, TRANSPORT, CBCE

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Citation

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MLA
Baumgartner, Simon, et al. “Substantial Organic and Particulate Nitrogen and Phosphorus Export from Geomorphologically Stable African Tropical Forest Landscapes.” ECOSYSTEMS, vol. 26, no. 3, 2023, pp. 553–67, doi:10.1007/s10021-022-00773-6.
APA
Baumgartner, S., Bauters, M., Drake, T. W., Barthel, M., Alebadwa, S., Bahizire, N., … Van Oost, K. (2023). Substantial organic and particulate nitrogen and phosphorus export from geomorphologically stable African tropical forest landscapes. ECOSYSTEMS, 26(3), 553–567. https://doi.org/10.1007/s10021-022-00773-6
Chicago author-date
Baumgartner, Simon, Marijn Bauters, Travis W. Drake, Matti Barthel, Serge Alebadwa, Nadine Bahizire, Basile Mujinya Bazirake, Johan Six, Pascal Boeckx, and Kristof Van Oost. 2023. “Substantial Organic and Particulate Nitrogen and Phosphorus Export from Geomorphologically Stable African Tropical Forest Landscapes.” ECOSYSTEMS 26 (3): 553–67. https://doi.org/10.1007/s10021-022-00773-6.
Chicago author-date (all authors)
Baumgartner, Simon, Marijn Bauters, Travis W. Drake, Matti Barthel, Serge Alebadwa, Nadine Bahizire, Basile Mujinya Bazirake, Johan Six, Pascal Boeckx, and Kristof Van Oost. 2023. “Substantial Organic and Particulate Nitrogen and Phosphorus Export from Geomorphologically Stable African Tropical Forest Landscapes.” ECOSYSTEMS 26 (3): 553–567. doi:10.1007/s10021-022-00773-6.
Vancouver
1.
Baumgartner S, Bauters M, Drake TW, Barthel M, Alebadwa S, Bahizire N, et al. Substantial organic and particulate nitrogen and phosphorus export from geomorphologically stable African tropical forest landscapes. ECOSYSTEMS. 2023;26(3):553–67.
IEEE
[1]
S. Baumgartner et al., “Substantial organic and particulate nitrogen and phosphorus export from geomorphologically stable African tropical forest landscapes,” ECOSYSTEMS, vol. 26, no. 3, pp. 553–567, 2023.
@article{8763027,
  abstract     = {{Aquatic losses of nutrients are important loss vectors in the nutrient budgets of tropical forests. Traditionally, research has focused mainly on losses of inorganic nutrient forms, whereas the potential contribution of organic and particulate losses to the total nutrient export budget is much less constrained. In this study, we quantified full aquatic nitrogen (N) and phosphorus (P) exports, including inorganic, organic and particulate forms, from a moist tropical lowland forest and a semi-dry Miombo woodland forest within the Congo Basin. While particulate organic N (PON) was the highest N loss vector in the lowland stream (3.34 kg N ha(-1) y(-1); 44% of TN), dissolved organic N (DON) dominated the export in the Miombo stream (1.41 kg N ha(-1) y(.-1); 47% of TN). Aquatic P export was dominated by dissolved organic P (DOP) in both streams, with yields of 0.29 kg P ha(-1) y(-1) (65% of TP) in the lowland and 0.24 kg P ha(-1) y(-1) (69% of TP) in the Miombo. Storm events were driving those losses, exporting disproportionally high N and P loads during short periods of stormflow conditions (32% and 47% of TN and 20% and 40% of TP in the lowland and Miombo, respectively). Our results highlight the need to take particulate and organic forms into account as important loss vectors in the nutrient balance of tropical forests. This finding is of particular importance considering the projected increasing rainfall intensities in many tropical regions which might exacerbate the export of these nutrient forms in the near future.}},
  author       = {{Baumgartner, Simon and Bauters, Marijn and Drake, Travis W. and Barthel, Matti and Alebadwa, Serge and Bahizire, Nadine and Bazirake, Basile Mujinya and Six, Johan and Boeckx, Pascal and Van Oost, Kristof}},
  issn         = {{1432-9840}},
  journal      = {{ECOSYSTEMS}},
  keywords     = {{biogeochemistry,tropical forests,Congo Basin,particulate organic nitrogen,particulate phosphorus,storm events,NUTRIENT LOSSES,SOIL-NITROGEN,AMAZON RIVER,CARBON,FLUXES,AVAILABILITY,WATERSHEDS,CATCHMENT,EMISSIONS,TRANSPORT,CBCE}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{553--567}},
  title        = {{Substantial organic and particulate nitrogen and phosphorus export from geomorphologically stable African tropical forest landscapes}},
  url          = {{http://doi.org/10.1007/s10021-022-00773-6}},
  volume       = {{26}},
  year         = {{2023}},
}
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