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Positive feedbacks and alternative stable states in forest leaf types

Abstract:
The emergence of alternative stable states in forest systems has significant implications for the functioning and structure of the terrestrial biosphere, yet empirical evidence remains scarce. Here, we combine global forest biodiversity observations and simulations to test for alternative stable states in the presence of evergreen and deciduous forest types. We reveal a bimodal distribution of forest leaf types across temperate regions of the Northern Hemisphere that cannot be explained by the environment alone, suggesting signatures of alternative forest states. Moreover, we empirically demonstrate the existence of positive feedbacks in tree growth, recruitment and mortality, with trees having 4-43% higher growth rates, 14-17% higher survival rates and 4-7 times higher recruitment rates when they are surrounded by trees of their own leaf type. Simulations show that the observed positive feedbacks are necessary and sufficient to generate alternative forest states, which also lead to dependency on history (hysteresis) during ecosystem transition from evergreen to deciduous forests and vice versa. We identify hotspots of bistable forest types in evergreen-deciduous ecotones, which are likely driven by soil-related positive feedbacks. These findings are integral to predicting the distribution of forest biomes, and aid to our understanding of biodiversity, carbon turnover, and terrestrial climate feedbacks.
Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1038/s41467-024-48676-5

Authors

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Role:
Author
ORCID:
0000-0002-4741-0934
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Role:
Author
ORCID:
0000-0002-8302-4854
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Role:
Author
ORCID:
0000-0003-4035-7760
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Role:
Author
ORCID:
0000-0003-0709-1438
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Role:
Author
ORCID:
0000-0002-5958-7016

Contributors

Institution:
University of Oxford
Division:
MPLS
Department:
Biology
Role:
Contributor
Institution:
University of Oxford
Division:
SSD
Department:
SOGE
Sub department:
Geography
Role:
Contributor
ORCID:
0000-0002-3503-4783
Institution:
University of Oxford
Division:
MPLS
Department:
Zoology
Role:
Contributor


More from this funder
Funder identifier:
https://ror.org/019w4f821
Grant:
101059888
Programme:
CLIMB-FOREST Horizon Europe Project
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Funder identifier:
https://ror.org/019w4f821
Grant:
265171
Programme:
Seventh Framework Programme (FP7/2007-2013)
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Funder identifier:
https://ror.org/03bjn0010
Grant:
403710/2012-0
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Funder identifier:
https://ror.org/0472cxd90
Grant:
291585
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Funder identifier:
https://ror.org/00znyv691
Grant:
DNRF173


Publisher:
Springer Nature
Journal:
Nature Communications More from this journal
Volume:
15
Issue:
1
Article number:
4658
Place of publication:
England
Publication date:
2024-05-31
Acceptance date:
2024-05-09
DOI:
EISSN:
2041-1723
Pmid:
38821957


Language:
English
Pubs id:
2007733
Local pid:
pubs:2007733
Deposit date:
2025-06-11
ARK identifier:

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