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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Turnover of recently assimilated carbon in arctic bryophytes
Author(s): Street, Lorna E
Subke, Jens-Arne
Sommerkorn, Martin
Heinemeyer, Andreas
Williams, Mathew
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Keywords: Mosses
NPP:GPP ratio
13C pulse-labelling
Carbon model
Carbon allocation
Autotrophic respiration
Mosses Arctic regions
Climatic changes Arctic regions
Atmospheric carbon dioxide Environmental aspects
Issue Date: Oct-2011
Date Deposited: 16-Sep-2011
Citation: Street LE, Subke J, Sommerkorn M, Heinemeyer A & Williams M (2011) Turnover of recently assimilated carbon in arctic bryophytes. Oecologia, 167 (2), pp. 325-337.
Abstract: Carbon (C) allocation and turnover in arctic bryophytes is largely unknown, but their response to climatic change has potentially significant impacts on arctic ecosystem C budgets. Using a combination of pulse-chase experiments and a newly developed model of C turnover in bryophytes, we show significant differences in C turnover between two contrasting arctic moss species (Polytrichum piliferum and Sphagnum fuscum). 13C abundance in moss tissues (measured up to 1 year) and respired CO2 (traced over 5 days) were used to parameterise the bryophyte C model with four pools representing labile and structural C in photosynthetic and stem tissue. The model was optimised using an Ensemble Kalman Filter to ensure a focus on estimating the confidence intervals (CI) on model parameters and outputs. The ratio of aboveground NPP:GPP in Polytrichum piliferum was 23% (CI 9–35%), with an average turnover time of 1.7 days (CI 1.1–2.5 days). The aboveground NPP:GPP ratio in Sphagnum fuscum was 43% (CI 19–65%) with an average turnover time of 3.1 days (CI 1.6–6.1 days). These results are the first to show differences in C partitioning between arctic bryophyte species in situ and highlight the importance of modelling C dynamics of this group separately from vascular plants for a realistic representation of vegetation in arctic C models.
DOI Link: 10.1007/s00442-011-1988-y
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