Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors

Werner C, Unger S, Pereira JS, Maia R, Kurz-Besson C, David TS, David JS, Máguas C (2006)
NEW PHYTOLOGIST 172(2): 330-346.

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Abstract
• Temporal dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) were evaluated on hourly, daily and annual timescales in a Mediterranean woodland. Emphasis was given to the periods of transition from wet to dry season and vice versa, when the system turns from a net carbon sink to a source. The constancy of nocturnal δ13CR was tested. • The relationship between δ13CR(determined through Keeling plots) and environmental factors was evaluated through time-lag analysis. • δ13CR exhibited high annual variation (>7‰). During the transition periods,δ13CR correlated significantly with factors influencing photosynthetic discrimination, soil respiration, and whole-canopy conductance. Time-lags differed between belowand above-ground variables, and between seasons. A shift in regression parameters with environmental factors indicated seasonal differences in ecosystem responsiveness (e.g. temperature acclimation). δ13CR exhibited substantial nocturnal enrichment (>4‰) from dusk to dawn. • These data indicate pronounced short-term dynamics in δ13CR at hourly to daily timescales and a modulated response to environmental drivers. Substantial shortterm changes in nocturnal δ13CR may have important implications for the sampling protocols of nocturnal Keeling plots.
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Werner C, Unger S, Pereira JS, et al. Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors. NEW PHYTOLOGIST. 2006;172(2):330-346.
Werner, C., Unger, S., Pereira, J. S., Maia, R., Kurz-Besson, C., David, T. S., David, J. S., et al. (2006). Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors. NEW PHYTOLOGIST, 172(2), 330-346.
Werner, C., Unger, S., Pereira, J. S., Maia, R., Kurz-Besson, C., David, T. S., David, J. S., and Máguas, C. (2006). Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors. NEW PHYTOLOGIST 172, 330-346.
Werner, C., et al., 2006. Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors. NEW PHYTOLOGIST, 172(2), p 330-346.
C. Werner, et al., “Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors”, NEW PHYTOLOGIST, vol. 172, 2006, pp. 330-346.
Werner, C., Unger, S., Pereira, J.S., Maia, R., Kurz-Besson, C., David, T.S., David, J.S., Máguas, C.: Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors. NEW PHYTOLOGIST. 172, 330-346 (2006).
Werner, Christiane, Unger, Stephan, Pereira, João Santos, Maia, Rodrigo, Kurz-Besson, Catherine, David, Teresa Soares, David, Jorge Soares, and Máguas, Cristina. “Importance of short-term dynamics in carbon isotope ratios of ecosystem respiration (δ13CR) in a Mediterranean oak woodland and linkage to environmental factors”. NEW PHYTOLOGIST 172.2 (2006): 330-346.
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