Ecosystem Feedbacks and Nitrogen Fixation in Forests

A special issue of Forests (ISSN 1999-4907).

Deadline for manuscript submissions: closed (31 March 2017) | Viewed by 6139

Special Issue Editor


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Guest Editor
Department of Chemistry, Université de Sherbrooke, Sherbrooke, QC, Canada

Special Issue Information

Dear Colleagues,

Biological di-nitrogen (N2) fixation occurs throughout many forested ecosystems by free-living diazotrophs or by symbiotic associations between bacteria and plants. These N2-fixers have a major role in supplying new nitrogen (N) to forest soils, particularly in regions where N availability influences forest succession, plant diversity, and limits forest productivity. Nitrogen fixation may also be important in replacing N losses from soil during disturbances such as timber harvesting or wild fires and, thus, may have directional effects on plant secondary succession, turnover of plant communities, the carbon cycle and forest productivity as forest ecosystems mature. Understanding how N2 fixation feeds backs to ecosystem is essential for the rationale management and preservation of forest ecosystems.

The objective of this Special Issue is to provide examples from natural and managed forested ecosystems throughout the globe to learn about different types of N2-fixing organisms and associations, their impact on ecosystem properties and processes and how these may respond, directly or indirectly, to abiotic and biotic factors. We also invite novel contributions that address the resilience of N2 fixation to climate change, forest management perturbation, or other global change factors.

We invite authors for this Special Issue from all disciplines to address any aspect of these issues within forested biomes. We welcome manuscripts reporting original investigations, reviews, and models.

Dr. Jean-Philippe Bellenger
Guest Editor

Manuscript Submission Information

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Keywords

  • Nitrogen fixation
  • Ecosystem Feedbacks
  • Disturbances
  • Biogeochemistry
  • Succession
  • Diazotrophs
  • Diversity and Composition
  • Climate Change
  • Forest Productivity
  • Forest Management

Published Papers (1 paper)

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Research

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Article
Elevated Atmospheric CO2 and Warming Stimulates Growth and Nitrogen Fixation in a Common Forest Floor Cyanobacterium under Axenic Conditions
by Zoë Lindo and Danielle A. Griffith
Forests 2017, 8(3), 73; https://doi.org/10.3390/f8030073 - 08 Mar 2017
Cited by 11 | Viewed by 5742
Abstract
The predominant input of available nitrogen (N) in boreal forest ecosystems originates from moss-associated cyanobacteria, which fix unavailable atmospheric N2, contribute to the soil N pool, and thereby support forest productivity. Alongside climate warming, increases in atmospheric CO2 concentrations are [...] Read more.
The predominant input of available nitrogen (N) in boreal forest ecosystems originates from moss-associated cyanobacteria, which fix unavailable atmospheric N2, contribute to the soil N pool, and thereby support forest productivity. Alongside climate warming, increases in atmospheric CO2 concentrations are expected in Canada’s boreal region over the next century, yet little is known about the combined effects of these factors on N fixation by forest floor cyanobacteria. Here we assess changes in N fixation in a common forest floor, moss-associated cyanobacterium, Nostoc punctiforme Hariot, under elevated CO2 conditions over 30 days and warming combined with elevated CO2 over 90 days. We measured rates of growth and changes in the number of specialized N2 fixing heterocyst cells, as well as the overall N fixing activity of the cultures. Elevated CO2 stimulated growth and N fixation overall, but this result was influenced by the growth stage of the cyanobacteria, which in turn was influenced by our temperature treatments. Taken together, climate change factors of warming and elevated CO2 are expected to stimulate N2 fixation by moss-associated cyanobacteria in boreal forest systems. Full article
(This article belongs to the Special Issue Ecosystem Feedbacks and Nitrogen Fixation in Forests)
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