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Forests 2018, 9(6), 324; https://doi.org/10.3390/f9060324

Response of Black Ash Wetland Gaseous Soil Carbon Fluxes to a Simulated Emerald Ash Borer Infestation

1
Department of Earth, Environmental and Geographical Sciences, Northern Michigan University, Marquette, MI 49855, USA
2
School of Forest Resources & Environmental Science, Michigan Technological University, Houghton, MI 49931, USA
3
Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW 2753, Australia
4
USDA Forest Service, Pacific Southwest Research Station, Arcata, CA 95521, USA
5
USDA Forest Service, Northern Research Station, Grand Rapids, MN 55744, USA
6
Department of Natural Resource Sciences, Thompson Rivers University, Kamloops, BC V2C 0C8, Canada
*
Author to whom correspondence should be addressed.
Received: 31 March 2018 / Revised: 9 May 2018 / Accepted: 23 May 2018 / Published: 4 June 2018
(This article belongs to the Special Issue Understanding and Managing Emerald Ash Borer Impacts on Ash Forests)
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Abstract

The rapid and extensive expansion of emerald ash borer (EAB) in North America since 2002 may eliminate most existing ash stands, likely affecting critical ecosystem services associated with water and carbon cycling. To our knowledge, no studies have evaluated the coupled response of black ash (Fraxinus nigra Marsh.) wetland water tables, soil temperatures, and soil gas fluxes to an EAB infestation. Water table position, soil temperature, and soil CO2 and CH4 fluxes were monitored in nine depressional headwater black ash wetlands in northern Michigan. An EAB disturbance was simulated by girdling (girdle) or felling (ash-cut) all black ash trees with diameters greater than 2.5 cm within treated wetlands (n = 3 per treatment). Soil gas fluxes were sensitive to water table position, temperature, and disturbance. Soil CO2 fluxes were significantly higher, and high soil CH4 fluxes occurred more frequently in disturbed sites. Soil CH4 fluxes in ash-cut were marginally significantly higher than girdle during post-treatment, yet both were similar to control sites. The strong connection between depressional black ash wetland study sites and groundwater likely buffered the magnitude of disturbance-related impact on water tables and carbon cycling. View Full-Text
Keywords: forested wetlands; Fraxinus nigra; invasive pest disturbance; greenhouse gas fluxes; soil carbon; biogeosciences; EAB forested wetlands; Fraxinus nigra; invasive pest disturbance; greenhouse gas fluxes; soil carbon; biogeosciences; EAB
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Van Grinsven, M.; Shannon, J.; Bolton, N.; Davis, J.; Noh, N.J.; Wagenbrenner, J.; Kolka, R.; Pypker, T. Response of Black Ash Wetland Gaseous Soil Carbon Fluxes to a Simulated Emerald Ash Borer Infestation. Forests 2018, 9, 324.

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