Stability in Ecosystem Functioning across a Climatic Threshold and Contrasting Forest Regimes
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Peer reviewed; Journal articlePeer reviewed
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Date
2011-01-18
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Classical ecological theory predicts that changes in the availability of essential resources such as nitrogen should lead to
changes in plant community composition due to differences in species-specific nutrient requirements. What remains
unknown, however, is the extent to which climate change will alter the relationship between plant communities and the
nitrogen cycle. During intervals of climate change, do changes in nitrogen cycling lead to vegetation change or do changes
in community composition alter the nitrogen dynamics? We used long-term ecological data to determine the role of
nitrogen availability in changes of forest species composition under a rapidly changing climate during the early Holocene
(16k to 8k cal. yrs. BP). A statistical computational analysis of ecological data spanning 8,000 years showed that secondary
succession from a coniferous to deciduous forest occurred independently of changes in the nitrogen cycle. As oak replaced
pine under a warming climate, nitrogen cycling rates increased. Interestingly, the mechanism by which the species
interacted with nitrogen remained stable across this threshold change in climate and in the dominant tree species. This
suggests that changes in tree population density over successional time scales are not driven by nitrogen availability. Thus,
current models of forest succession that incorporate the effects of available nitrogen may be over-estimating tree
population responses to changes in this resource, which may result in biased predictions of future forest dynamics under
climate warming.
Citation
PLoS ONE 6(1): e16134Publisher
Public Library of ScienceCollections
Copyright 2011 Jeffers et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.