Sphagnum abundance and photosynthetic capacity show rapid short-term recovery following managed burning

Grau-Andrés, R., Gray, A. and Davies, G. M. (2017) Sphagnum abundance and photosynthetic capacity show rapid short-term recovery following managed burning. Plant Ecology and Diversity, 10(4), pp. 353-359. (doi: 10.1080/17550874.2017.1394394)

Abstract

Background: Prescribed burning in peatlands is controversial due to concerns over damage to their ecological functioning, particularly regarding their key genus Sphagnum. However, empirical evidence is scarce. Aims: The aim of the article is to quantify Sphagnum recovery following prescribed burns. Methods: We completed nine fires at a raised bog in Scotland, achieving a range of fire severities by simulating drought in some plots. We measured Sphagnum cover and chlorophyll fluorescence Fv/Fm ratio (an estimate of photosynthetic capacity) up to 36 months post-fire. Results: Cover of dominant Sphagnum capillifolium was similar in unburnt and burnt plots, likely due to its high moisture content which prevented combustion. Burning decreased S. capillifolium Fv/Fm 5 months after fire from 0.67 in unburnt plots to 0.44 in low fire severity plots and 0.24 in higher fire severity (drought) plots. After 22 months, Fv/Fm in burnt plots showed a healthy photosynthetic capacity of 0.76 and no differences between severity treatments. Other Sphagnum species showed similar post-fire recovery though their low overall abundance precluded formal statistical analysis. Conclusions: S. capillifolium is resilient to low–moderate fire severities and the same may be true for a number of other species. This suggests that carefully applied managed burning can be compatible with the conservation of peatland ecosystem function.

• Item Type: Articles
• Additional Information: Roger Grau-Andrés was funded by the Lord Kelvin and Adam Smith scholarship (University of Glasgow).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Grau Andres, Mr Roger
• Authors: Grau-Andrés, R., Gray, A., and Davies, G. M.
• College/School: College of Science and Engineering > School of Geographical and Earth Sciences
• Journal Name: Plant Ecology and Diversity
• Publisher: Taylor & Francis
• ISSN: 1755-0874
• ISSN (Online): 1755-1668
• Published Online: 20 November 2017
• Copyright Holders: Copyright © 2017 The Authors
• First Published: First published in Plant Ecology and Diversity 10(4): 353-359
• Publisher Policy: Reproduced under a Creative Commons License