Assessing the Effects of Climate Change and Air Pollution on Soil Properties and Plant Diversity in Sugar Maple–Beech–Yellow Birch Hardwood Forests in the Northeastern United States: Model Simulations from 1900 to 2100
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Historical deposition of nitrogen (N) and sulfur (S) over the Eastern United States has impacted ecosystem structure and function. The potential for recovery of ecosystems is relatively uncertain, with deposition paired with future climate change contributing to this uncertainty. The impacts of N and S deposition and climate change (from 1900 to 2100) on two sugar maple–beech–yellow birch sites in the Northeastern United States were evaluated using the paired biogeochemical–vegetation response model ForSAFE-Veg at two research sites, Hubbard Brook Experimental Forest and Bear Brook Watershed. Deposition was found to be the dominant stressor, causing changes in soil acid–base chemistry, N enrichment, and shifts in understory species composition. Responses of the two sites varied due primarily to differences in buffering capacity and levels of deposition. However, at both sites, recovery of soil and plant community properties to 1900 conditions was approached only when future deposition to 2100 was returned to pre-industrial levels. Policy-based reductions in deposition generally halted further damage to soils and plants and resulted in no or only partial recovery. Increased temperatures and precipitation according to Intergovernmental Panel on Climate Change (IPCC) climate futures stimulated soil and plant response, thereby accelerating changes in plant communities and N enrichment and counteracting the acidifying impacts of N and S deposition on soil acid–base chemistry.
KeywordsDeposition Climate Soil Understory vegetation Model Hubbard Brook Bear Brook
The data for Hubbard Brook Experimental Forest (HBEF) were largely derived from the datasets of the cooperative Hubbard Brook Ecosystem Study, which is operated and maintained by the U.S. Department of Agriculture (USDA) Forest Service (USFS). The data for Bear Brook Watershed in Maine (BBWM) were derived from datasets from the BBWM research program and publications. The BBWM data have been collected since 1986 with support from the U.S. EPA, U.S. National Science Foundation, U.S. Geological Survey, USFS, the Maine Agricultural and Forest Experiment Station, the Senator George Mitchell Center for Environmental and Watershed Research, and the University of Maine. The project principal investigators are I.J. Fernandez, J.S. Kahl, S.A. Norton, L.E. Rustad, and G.B. Wiersma. The University of Maine has a long-term lease with the International Paper Corporation, the landowner. The authors appreciate the access to these data and would like to specifically acknowledge the extra efforts of Cheryl Spencer in providing the East Bear soil samples, Farrah Fatemi for providing the BBWM soil solution data, Scott Bailey for providing the HBEF soil chemistry data, and Natalie Cleavitt for measuring the understory vegetation in HBEF.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no competing interests.
This study was funded by the U.S. EPA (contract EP-C-11-036).
The views presented here are those of the authors and do not represent official views or policy of the U.S. Environmental Protection Agency (EPA) or any other U.S. federal agency.
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