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Carbon stocks and dynamics at different successional stages in an Afromontane tropical forest

Journal article
Authors Brigitte Nyirambangutse
Etienne Zibera
Félicien K. Uwizeye
Donat Nsabimana
Elias Bizuru
Håkan Pleijel
Johan Uddling
Göran Wallin
Published in Biogeosciences
Volume 14
Pages 1285-1303
ISSN 1726-4170
Publication year 2017
Published at Department of Biological and Environmental Sciences
Pages 1285-1303
Language en
Links dx.doi.org/10.5194/bg-14-1285-2017
Subject categories Botany, Climate Research, Terrestrial ecology

Abstract

As a result of different types of disturbance, forests are a mixture of stands at different stages of ecological succession. Successional stage is likely to influence forest productivity and carbon storage, linking the degree of forest disturbance to the global carbon cycle and climate. Although tropical montane forests are an important part of tropical forest ecosystems (ca. 8%, elevation > 1000ma.s.l.), there are still significant knowledge gaps regarding the carbon dynamics and stocks of these forests, and how these differ between early (ES) and late successional (LS) stages. This study examines the carbon (C) stock, relative growth rate (RGR) and net primary production (NPP) of ES and LS forest stands in an Afromontane tropical rainforest using data from inventories of quantitatively important ecosystem compartments in fifteen 0.5ha plots in Nyungwe National Park in Rwanda. The total C stock was 35% larger in LS compared to ES plots due to significantly larger above-ground biomass (AGB; 185 and 76MgCh-1 in LS and ES plots), while the soil and root C stock (down to 45cm depth in the mineral soil) did not significantly differ between the two successional stages (178 and 204MgCh-1 in LS and ES plots). The main reasons for the difference in AGB were that ES trees had significantly lower stature and wood density compared to LS trees. However, ES and LS stands had similar total NPP (canopy, wood and roots of all plots ĝ1/4 9.4MgCh-1) due to counterbalancing effects of differences in AGB (higher in LS stands) and RGR (higher in ES stands). The AGB in the LS plots was considerably higher than the average value reported for old-growth tropical montane forest of south-east Asia and Central and South America at similar elevations and temperatures, and of the same magnitude as in tropical lowland forest of these regions. The results of this study highlight the importance of accounting for disturbance regimes and differences in wood density and allometry of tree species dominating at different successional stages in an attempt to quantify the C stock and sink strength of tropical montane forests and how they may differ among continents.

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