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A slow opportunist: physiological and growth responses of an obligate understory plant to patch cut harvesting

  • Physiological ecology - original research
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Abstract

Understory light environments change rapidly following timber harvest, and while many understory species utilize and benefit from the additional light, this response is not ubiquitous in shade-obligate species. I examined the effects of patch cut timber harvest on the physiology and growth of an obligate forest understory species to determine if disturbances via timber harvest are physiological stressors or whether such disturbances provide physiological benefits and growth increases in understory species. Forest canopy structure, along with photosynthesis, respiration, water use efficiency, stomatal conductance, and growth rates of American ginseng were quantified one summer before and two summers after patch cut timber harvest. Survival following timber harvest was lower than that observed at undisturbed populations; however, growth of survivors increased post-harvesting, with growth increasing as a function of canopy openness. Light response curves as well as photosynthesis and respiration rates indicated that plants were not well acclimated to higher light levels in the growing season after timber harvest, but rather to two growing seasons after harvest. Relative growth rate formed a positive linear relationship with maximum photosynthesis following timber harvest. My study suggests that ginseng is a “slow opportunist”, because while it benefits from sudden light increases, acclimation lags at least one growing season behind canopy changes. American ginseng is surprisingly resilient in the face of a discrete environmental shift and may benefit from forest management strategies that mimic the natural disturbance regimes common in mature forests throughout its range.

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Acknowledgements

I would like to thank James B. McGraw, Richard Thomas, Thomas Schuler, and Shawn Bergman for their helpful comments. For their help in the field, I thank Colin Mitchell, Kyle Gregory, Michael Elza, Anne Jarrell, and Quinn Doyle. Site access was provided by the USDA Forest Service.

Author contribution statement

JLC conceived, designed, and executed this study and wrote the manuscript. No other person is entitled to authorship.

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  1. Jennifer L. Chandler

    Present address: Department of Biology, Appalachian State University, 572 Rivers Street, Boone, NC, 28608, USA

Authors and Affiliations

  1. Department of Biology, West Virginia University, 53 Campus Drive, P.O. Box 6057, Morgantown, WV, 26506-6057, USA

    Jennifer L. Chandler

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  1. Jennifer L. Chandler
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Correspondence to Jennifer L. Chandler.

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The study was funded in part by NSF Grants DEB-0613611 and DEB-1118702.

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The author declares no conflict of interest.

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This article does not contain any studies with human participants or animals performed by the author.

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Communicated by Russell K. Monson.

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Chandler, J.L. A slow opportunist: physiological and growth responses of an obligate understory plant to patch cut harvesting. Oecologia 183, 677–687 (2017). https://doi.org/10.1007/s00442-017-3808-5

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