Document Type

Article

Publication Date

2013

DOI

10.1111/nph.12409

Publication Title

New Phytologist

Volume

200

Issue

3

Pages

767-777

Abstract

Disturbance affects most terrestrial ecosystems and has the potential to shape their responses to chronic environmental change. Scrub-oak vegetation regenerating from fire disturbance in subtropical Florida was exposed to experimentally elevated carbon dioxide (CO2) concentration (+350ll-1) using open-top chambers for 11yr, punctuated by hurricane disturbance in year 8. Here, we report the effects of elevated CO2 on aboveground and belowground net primary productivity (NPP) and nitrogen (N) cycling during this experiment. The stimulation of NPP and N uptake by elevated CO2 peaked within 2yr after disturbance by fire and hurricane, when soil nutrient availability was high. The stimulation subsequently declined and disappeared, coincident with low soil nutrient availability and with a CO2-induced reduction in the N concentration of oak stems. These findings show that strong growth responses to elevated CO2 can be transient, are consistent with a progressively limited response to elevated CO2 interrupted by disturbance, and illustrate the importance of biogeochemical responses to extreme events in modulating ecosystem responses to global environmental change.

Rights

© The Authors. Gold open access on Web of Science.

Original Publication Citation

Hungate, B. A., Day, F. P., Dijkstra, P., Duval, B. D., Hinkle, C. R., Langley, J. A., . . . Drake, B. G. (2013). Fire, hurricane and carbon dioxide: Effects on net primary production of a subtropical woodland. New Phytologist, 200(3), 767-777. doi:10.1111/nph.12409

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