Abstract
Aims
Using a natural gradient of recent (0–4 years) mountain pine beetle (Dendroctonus ponderosae)-caused mortality in lodgepole pine (Pinus contorta) stands in west central Alberta, Canada, we tested the effects of different levels of tree mortality, and time since bark beetle infestation, on initial abiotic environmental changes, and nutrient inputs and cycling.
Methods
We quantified the impacts of D. ponderosae outbreak on input rates of pine needle litter and nutrients, live root mass (both course and fine), supply rates of plant-available nutrients, and concentrations of total mineral soil phenols.
Results
Pine needle litter, nutrient concentrations, and needle nutrient inputs are all increased as a function of either tree mortality or time since bark beetle infestation. Supply rates of many mineral nutrients increased in soils across gradients of mortality or time. Shallow fine root mass declined by half in response to beetle disturbance; concentrations of soil phenols also shrank by over half, potentially due to increased root losses. Soil phenolics were negatively associated with the supply rate of soil nitrate.
Conclusion
We concluded that the effects of tree mortality on stand biogeochemistry in pine stands with no recorded history of mountain pine beetle is similar to earlier studies conducted in the beetle’s historical range.
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Acknowledgments
This study was made possible by awards through Natural Sciences and Engineering Research Council of Canada Strategic and Discover grants to NE and JFC; funding sources played no role in the development of the study’s design, or collection, analysis, and interpretation of data, nor the decision to submit this article for publication. We also thank to Canada Research Chairs Program (http://www.chairs-chaires.gc.ca/home-accueil-eng.aspx) for their support NE. We thank Morgan Randall and Brittany Wingert for field assistance, Pak Chow (the University of Alberta) for assistance in the analysis of soil phenolics, Jonathan Bennett for assistance with statistical analyses, and numerous AESRD and Foothills Research Institute staff for assistance with field-site selection. The critical examinations by two anonymous reviewers are greatly appreciated as their comments substantially improved the quality of this manuscript.
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Cigan, P.W., Karst, J., Cahill, J.F. et al. Influence of bark beetle outbreaks on nutrient cycling in native pine stands in western Canada. Plant Soil 390, 29–47 (2015). https://doi.org/10.1007/s11104-014-2378-0
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DOI: https://doi.org/10.1007/s11104-014-2378-0