Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Biogeosciences, 12, 5635-5646, 2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
07 Oct 2015
Annual litterfall dynamics and nutrient deposition depending on elevation and land use at Mt. Kilimanjaro
J. Becker1, H. Pabst1, J. Mnyonga2, and Y. Kuzyakov1,3 1Department of Soil Science of Temperate Ecosystems, University of Göttingen, Göttingen, Germany
2Department of Forest Biology, Sokoine University of Agriculture, Morogoro, Tanzania
3Department of Agricultural Soil Science, University of Göttingen, Göttingen, Germany
Abstract. Litterfall is one of the major pathways connecting above- and below-ground processes. The effects of climate and land-use change on carbon (C) and nutrient inputs by litterfall are poorly known. We quantified and analyzed annual patterns of C and nutrient deposition via litterfall in natural forests and agroforestry systems along the unique elevation gradient of Mt. Kilimanjaro.

Tree litter in three natural (lower montane, Ocotea and Podocarpus forests), two sustainably used (homegardens) and one intensively managed (shaded coffee plantation) ecosystems was collected on a biweekly basis from May 2012 to July 2013. Leaves, branches and remaining residues were separated and analyzed for C and nutrient contents.

The annual pattern of litterfall was closely related to rainfall seasonality, exhibiting a large peak towards the end of the dry season (August–October). This peak decreased at higher elevations with decreasing rainfall seasonality. Macronutrients (N, P, K) in leaf litter increased at mid elevation (2100 m a.s.l.) and with land-use intensity. Carbon content and micronutrients (Al, Fe, Mn, Na) however, were unaffected or decreased with land-use intensity.

While leaf litterfall decreased with elevation, total annual input was independent of climate. Compared to natural forests, the nutrient cycles in agroforestry ecosystems were accelerated by fertilization and the associated changes in dominant tree species.

Citation: Becker, J., Pabst, H., Mnyonga, J., and Kuzyakov, Y.: Annual litterfall dynamics and nutrient deposition depending on elevation and land use at Mt. Kilimanjaro, Biogeosciences, 12, 5635-5646,, 2015.
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