Abstract
We examined the influence of treefall gaps on soil properties and processes in old growth northern hardwood-hemlock forests in the upper Great Lakes region, USA. We found significantly greater solar radiation, soil moisture contents and soil temperatures in gaps compared to adjacent closed canopy plots. Gaps had significantly less exchangeable base cations (K, Ca, and Mg) compared to forest plots in the upper mineral soil (0–25 cm). Gaps also had significantly more dissolved organic N and extractable nitrate at depth (25–50 cm), indicating increased nutrient leaching in gaps. In-situ N mineralization was significantly greater in gaps and edge plots compared to forest plots. We found significantly greater potential N mineralization (measured in the laboratory at 25°C and 40% water holding capacity) in forest compared to gap plots. Microbial biomass N was significantly greater (ca. two-fold) in the gap edge compared to both gaps and closed forest. Using principal component analyses we found that edge plots were positively correlated with all principal components, indicating increased in-situ and potential N mineralization, microbial biomass N, soil NO −3 and NH +4 , and soil organic matter. The gap edge may be a region of optimal microclimate and substrate to enhance microbial biomass and activity within these forest ecosystems.
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Abbreviations
- PMWSP:
-
Porcupine Mountains Wilderness State Park
- HMC:
-
Huron Mountain Club
- PMN:
-
Potential N mineralization
- MBN:
-
Microbial biomass N
- DON:
-
Dissolved organic N
- SOM:
-
Soil organic matter
- Nmin :
-
N mineralization (in-situ)
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Acknowledgements
The authors gratefully acknowledge financial support from Hatch and McIntire-Stennis United States Department of Agriculture, Cooperative State Research, Education and Extension Service. Permission to work in the Huron Mountains was granted by Kerry Woods, Director of Research, on behalf of the Huron Mountain Wildlife Foundation and Club. We also thank Robert Sprague, Park Manager of the Porcupine Mountains Wilderness State Park for his consent and technical assistance in the Porcupine Mountains.
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Scharenbroch, B.C., Bockheim, J.G. Impacts of forest gaps on soil properties and processes in old growth northern hardwood-hemlock forests. Plant Soil 294, 219–233 (2007). https://doi.org/10.1007/s11104-007-9248-y
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DOI: https://doi.org/10.1007/s11104-007-9248-y