Articles | Volume 7, issue 1
SOIL, 7, 83–94, 2021
https://doi.org/10.5194/soil-7-83-2021

Special issue: Tropical biogeochemistry of soils in the Congo Basin and the...

SOIL, 7, 83–94, 2021
https://doi.org/10.5194/soil-7-83-2021

Original research article 30 Mar 2021

Original research article | 30 Mar 2021

Stable isotope signatures of soil nitrogen on an environmental–geomorphic gradient within the Congo Basin

Simon Baumgartner et al.

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Cited articles

Alvarez-Clare, S., Mack, M. C., and Brooks, M.: A direct test of nitrogen and phosphorus limitation to net primary productivity in a lowland tropical wet forest, Ecology, 94, 1540–1551, https://doi.org/10.1890/12-2128.1, 2013. 
Amundson, R., Austin, A. T., Schuur, E. A. G., Yoo, K., Matzek, V., Kendall, C., Uebersax, A., Brenner, D., and Baisden, W. T.: Global patterns of the isotopic composition of soil and plant nitrogen, Global Biogeochem. Cy., 17, 1, https://doi.org/10.1029/2002GB001903, 2003. 
Angelini, M. E., Heuvelink, B. M., and Kempen, B.: Multivariate mapping of soil with structural equation modelling, Eur. J. Soil Sci., 68, 575–591, https://doi.org/10.1111/ejss.12446, 2017. 
Asner, G. P., Anderson, C. B., Martin, R. E., Tupayachi, R., Knapp, D. E., and Sinca, F.: Landscape biogeochemistry reflected in shifting distributions of chemical traits in the Amazon forest canopy, Nat. Geosci., 8, 567–575, https://doi.org/10.1038/ngeo2443, 2015. 
Austin, A. T. and Vitousek, P. M.: Nutrient dynamics on a precipitation gradient in Hawai'i, Oecologia, 113, 519–529, https://doi.org/10.1007/978-3-642-78568-9_6, 1998. 
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We compared stable isotope signatures of soil profiles in different forest ecosystems within the Congo Basin to assess ecosystem-level differences in N cycling, and we examined the local effect of topography on the isotopic signature of soil N. Soil δ15N profiles indicated that the N cycling in in the montane forest is more closed, whereas the lowland forest and Miombo woodland experienced a more open N cycle. Topography only alters soil δ15N values in forests with high erosional forces.