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Climate-driven spatial and temporal patterns in peatland pool biogeochemistry
Julien Arsenault1,2, Julie Talbot1,2, Lee E Brown3
1Département de Géographie, Université de Montréal, Montréal, Canada.
Global Change Biology
|April 28, 2023
Summary
Peatland pools are sensitive to climate and terrain, influencing carbon and nutrient cycles. Understanding these drivers helps predict their role in global biogeochemical processes and their response to environmental change.
Area of Science:
- Environmental Science
- Ecology
- Biogeochemistry
Background:
- Peatland pools are dynamic freshwater ecosystems in organic sediments.
- Their biogeochemical cycles are poorly understood, limiting predictions of their environmental change response.
Purpose of the Study:
- To determine how climate and terrain influence carbon (C), nitrogen (N), and phosphorus (P) dynamics in peatland pools.
- To assess the spatiotemporal drivers of peatland pool biogeochemistry.
Main Methods:
- Collected biogeochemical data from 20 peatlands across Canada, UK, and Patagonia.
- Analyzed multi-year data from an undisturbed eastern Canadian peatland.
Main Results:
- Climate (24%) and terrain (13%) significantly explained variations in pool biogeochemistry.
- Dissolved organic carbon (DOC), CO2, total N, and DOC aromaticity were highest in shallow pools and at the end of growing seasons.
- These factors increased from 2016-2021 with rising precipitation, temperature, and heat days.
Conclusions:
- Broad-scale terrain predicts pool biogeochemistry, while climate gradients and local variations drive responses.
- Peatland pools are reactive to environmental change and can serve as climate sentinels.
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