Net primary productivity and litter decomposition rates in two distinct Amazonian peatlands.

Autor: Dargie GC; School of Geography, University of Leeds, Leeds, UK., Del Aguila-Pasquel J; Instituto de Investigaciones de la Amazonía Peruana, Iquitos, Peru., Córdova Oroche CJ; Instituto de Investigaciones de la Amazonía Peruana, Iquitos, Peru., Irarica Pacaya J; Instituto de Investigaciones de la Amazonía Peruana, Iquitos, Peru., Reyna Huaymacari J; Instituto de Investigaciones de la Amazonía Peruana, Iquitos, Peru., Baker TR; School of Geography, University of Leeds, Leeds, UK., Hastie A; Departments of Botany, Physical Geography & Geoecology, Charles University, Prague, Czechia., Honorio Coronado EN; School of Geography and Sustainable Development, University of St Andrews, St Andrews, UK.; Royal Botanic Gardens, Kew, Richmond, Surrey, UK., Lewis SL; School of Geography, University of Leeds, Leeds, UK.; Department of Geography, University College London, London, UK., Roucoux KH; School of Geography and Sustainable Development, University of St Andrews, St Andrews, UK., Mitchard ET; School of Geosciences, University of Edinburgh, Edinburgh, UK.; Space Intelligence Ltd, Edinburgh, UK., Williams M; School of Geosciences, University of Edinburgh, Edinburgh, UK., Draper FCH; School of Environmental Sciences, University of Liverpool, Liverpool, UK., Lawson IT; School of Geography and Sustainable Development, University of St Andrews, St Andrews, UK.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2024 Aug; Vol. 30 (8), pp. e17436.
DOI: 10.1111/gcb.17436
Abstrakt: Measurements of net primary productivity (NPP) and litter decomposition from tropical peatlands are severely lacking, limiting our ability to parameterise and validate models of tropical peatland development and thereby make robust predictions of how these systems will respond to future environmental and climatic change. Here, we present total NPP (i.e., above- and below-ground) and decomposition data from two floristically and structurally distinct forested peatland sites within the Pastaza Marañón Foreland Basin, northern Peru, the largest tropical peatland area in Amazonia: (1) a palm (largely Mauritia flexuosa) dominated swamp forest and (2) a hardwood dominated swamp forest (known as 'pole forest', due to the abundance of thin-stemmed trees). Total NPP in the palm forest and hardwood-dominated forest (9.83 ± 1.43 and 7.34 ± 0.84 Mg C ha -1  year -1 , respectively) was low compared with values reported for terra firme forest in the region (14.21-15.01 Mg C ha -1  year -1 ) and for tropical peatlands elsewhere (11.06 and 13.20 Mg C ha -1  year -1 ). Despite the similar total NPP of the two forest types, there were considerable differences in the distribution of NPP. Fine root NPP was seven times higher in the palm forest (4.56 ± 1.05 Mg C ha -1  year -1 ) than in the hardwood forest (0.61 ± 0.22 Mg C ha -1  year -1 ). Above-ground palm NPP, a frequently overlooked component, made large contributions to total NPP in the palm-dominated forest, accounting for 41% (14% in the hardwood-dominated forest). Conversely, Mauritia flexuosa litter decomposition rates were the same in both plots: highest for leaf material, followed by root and then stem material (21%, 77% and 86% of mass remaining after 1 year respectively for both plots). Our results suggest potential differences in these two peatland types' responses to climate and other environmental changes and will assist in future modelling studies of these systems.
(© 2024 The Author(s). Global Change Biology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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