Articles | Volume 9, issue 2
https://doi.org/10.5194/soil-9-461-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/soil-9-461-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Original research article
| 
29 Aug 2023
Original research article |
| 29 Aug 2023
| 29 Aug 2023
Earthworm-invaded boreal forest soils harbour distinct microbial communities
Department of Renewable Resources, University of Alberta, Edmonton,
Alberta, Canada
current address: Department of Terrestrial Ecology, Netherlands Institute
of Ecology (NIOO-KNAW), Wageningen, the Netherlands
Sylvie Quideau
Department of Renewable Resources, University of Alberta, Edmonton,
Alberta, Canada
Jérôme Laganière
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry
Centre, Québec City, Quebec, Canada
Justine Karst
Department of Renewable Resources, University of Alberta, Edmonton,
Alberta, Canada
Christine Martineau
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry
Centre, Québec City, Quebec, Canada
Mathew Swallow
Department of Earth and Environmental Sciences, Mount Royal
University, Calgary, Alberta, Canada
Charlotte Norris
Natural Resources Canada, Canadian Forest Service, Pacific Forestry
Centre, Victoria, British Columbia, Canada
Abdul Samad
Natural Resources Canada, Canadian Forest Service, Laurentian Forestry
Centre, Québec City, Quebec, Canada
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This study reviews how remote sensing is used to monitor forest soil degradation after disturbance. It shows that remote sensing works best when wildfire or harvesting create visible surface change, while monitoring subsurface soil degradation still requires field measurement. Satellite data support large‑scale screening, and laser scanning and photogrammetry detect localized machinery impacts. These findings clarify realistic uses of remote sensing for forest soil monitoring and reporting.
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Major soil carbon pools and fluxes were assessed along a climatic gradient expanding 4 °C in mean annual temperature for two important boreal conifer forest stand types. Species and a warmer climate affected soil organic matter (SOM) cycling but not stocks. Contrarily to common hypotheses, SOM lability was not reduced by warmer climatic conditions and perhaps increased. Results apply to cold and wet conditions and a stable vegetation composition along the climate gradient.
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Soil respiration is a large and temperature-responsive flux in the global carbon cycle. We found increases in microbial use of easy to degrade substrates enhanced the temperature response of respiration in soils layered as they are in situ. This enhanced response is consistent with soil composition differences in warm relative to cold climate forests. These results highlight the importance of the intact nature of soils rarely studied in regulating responses of CO2 fluxes to changing temperature.
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Short summary
Earthworm invasion in North American forests can alter soil functioning. We investigated how the presence of invasive earthworms affected microbial communities, key drivers of soil biogeochemistry, across the major soil types of the Canadian boreal forest, which is a region largely understudied. Although total microbial biomass did not change, community composition shifted in earthworm-invaded mineral soils, where we also found higher fungal biomass and greater microbial species diversity.
Earthworm invasion in North American forests can alter soil functioning. We investigated how the...
