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| Spruce and Peatland Responses Under Changing Environments (SPRUCE) | |
|---|---|
| Name | Spruce and Peatland Responses Under Changing Environments (SPRUCE) |
| Location | Marcell Experimental Forest, Minnesota, United States |
| Established | 2015 |
| Coordinates | 47.483°N 93.447°W |
| Lead institution | Oak Ridge National Laboratory |
| Partners | University of Minnesota, Lawrence Berkeley National Laboratory, Pacific Northwest National Laboratory |
Spruce and Peatland Responses Under Changing Environments (SPRUCE) is a large-scale field experiment investigating how climate change affects boreal and temperate peatland ecosystems. The project manipulates temperature and carbon dioxide concentrations in situ at the Marcell Experimental Forest to study responses of black spruce and other species, peatland carbon dynamics, and greenhouse gas fluxes. SPRUCE integrates long-term ecological research with advanced biogeochemical and atmospheric measurement techniques to inform climate models and policy.
SPRUCE operates within the Marcell Experimental Forest and is led by Oak Ridge National Laboratory in partnership with institutions such as University of Minnesota, Lawrence Berkeley National Laboratory, and Pacific Northwest National Laboratory. The project builds on antecedent studies at the Long-Term Ecological Research (LTER) Network and connects to initiatives like the National Ecological Observatory Network and the U.S. Department of Energy. SPRUCE’s experimental footprint addresses responses of Picea mariana stands, peat accumulation, and methanogenesis under projected Intergovernmental Panel on Climate Change warming scenarios. The site’s legacy ties to regional programs including the Minnesota Department of Natural Resources, National Science Foundation, and collaborations with University of Alaska Fairbanks researchers.
SPRUCE aims to quantify how elevated temperature and elevated carbon dioxide alter carbon balance, tree physiology, peat decomposition, and trace gas emissions. Objectives align with priorities from the Intergovernmental Panel on Climate Change reports and recommendations from the U.S. Global Change Research Program. The experimental design uses multiple whole-ecosystem enclosures to impose stepwise warming treatments and CO2 enrichment across gradients informed by climate projections from the Coupled Model Intercomparison Project and scenarios used by the National Climate Assessment. Treatments examine ecosystem thresholds relevant to policies such as the Clean Air Act and international accords like the Paris Agreement insofar as peatland carbon feedbacks influence global radiative forcing.
The project deploys open-top chamber arrays, deep-soil heating probes, and aboveground canopy heaters to achieve target temperature anomalies, integrating instrumentation from national laboratories including Oak Ridge National Laboratory and Lawrence Berkeley National Laboratory. Gas flux measurements use eddy covariance towers following protocols from AmeriFlux and employ cavity ring-down spectroscopy and gas chromatography with standards traceable to International Bureau of Weights and Measures. Soil and peat cores are analyzed for bulk density, carbon content, and radiocarbon age using accelerator mass spectrometry linked to facilities like National Oceanic and Atmospheric Administration-affiliated labs. Vegetation physiology is monitored via chlorophyll fluorescence systems and stable isotope analysis guided by methods from the American Society of Plant Biologists and analytical frameworks used by the U.S. Geological Survey.
Publications from SPRUCE teams report accelerated peat decomposition, increased methane emissions, and shifts in tree growth and mortality under higher temperature treatments. Observed responses echo patterns reported in studies at the Hudson Bay Lowlands and synthesis efforts coordinated by the International Peatland Society. Results show nonlinear feedbacks between warming magnitude and carbon release, informing parameterizations in models used by the Intergovernmental Panel on Climate Change and datasets curated by the Global Carbon Project. SPRUCE findings have implications for projecting Arctic and boreal carbon budgets alongside field results from sites such as Toolik Field Station and Abisko Scientific Research Station.
SPRUCE contributes evidence that peatland warming can convert long-term carbon sinks into shorter-term carbon sources, with consequences for greenhouse gas budgets considered by the United Nations Framework Convention on Climate Change and emissions assessments in the World Meteorological Organization reports. The work informs land-surface modules in Earth system models developed by centers like National Center for Atmospheric Research and Hadley Centre and supports mitigation dialogues in forums such as the Convention on Biological Diversity. Findings also bear on regional resource management overseen by the Minnesota Department of Natural Resources and conservation strategies advocated by organizations like The Nature Conservancy.
SPRUCE is funded by the U.S. Department of Energy through programs administered by Oak Ridge National Laboratory and receives support from agencies including the National Science Foundation, U.S. Geological Survey, and state partners. Scientific collaborations include universities and national labs such as University of Minnesota, Lawrence Berkeley National Laboratory, Pacific Northwest National Laboratory, and international partners with links to the University of Edinburgh and University of Helsinki. Peer-reviewed outputs have appeared in journals connected to societies like the Ecological Society of America and the American Geophysical Union.
SPRUCE adheres to data-management plans aligned with National Science Foundation and U.S. Department of Energy policies, depositing datasets in repositories interoperable with networks like AmeriFlux and the Oak Ridge National Laboratory Distributed Active Archive Center. Data products include continuous flux records, peat core chronologies, and remote-sensing products compatible with platforms maintained by NASA and the European Space Agency. Metadata standards follow guidance from the Global Change Information System to facilitate reuse by modeling centers such as the Coupled Model Intercomparison Project participants and synthesis teams like the Global Carbon Project.
Category:Ecological experiments Category:Peatlands Category:Climate change research