NDLI: Effects of wildfire on long-term soil CO$_{2}$ concentration: implications for karst processes

Content Provider	Springer Nature Link
Author	Coleborn, Katie Spate, Andy Tozer, Mark Andersen, Martin S. Fairchild, Ian J. MacKenzie, Berin Treble, Pauline C. Meehan, Sophia Baker, Andrew Baker, Andy
Copyright Year	2016
Abstract	Wildfires reduce soil CO$_{2}$ concentration by destroying vegetation and soil-dwelling microbes, thus reducing soil respiration. Post-fire vegetation recovery is primarily determined by vegetation growth forms and modes of regeneration, whereas long-term recovery of soil microbes is largely dependent on vegetation rehabilitation. With previous research focussing on post-fire respiration recovery in the context of CO$_{2}$ flux between the soil and atmosphere, there is a lack of studies measuring the long-term response of soil CO$_{2}$ concentration in karst environments. Hence, this study aimed to quantify whether soil CO$_{2}$ concentration was reduced 5 and 10 years after fires in a karst environment and to consider the implications for karst dissolution processes and speleothem growth rate. Paired sites with burnt and unburnt soil were compared with regards to soil CO$_{2}$ concentration, soil temperature and soil moisture. Samples were taken from a grassland community and woodland community burnt 5 years prior and a forest community burnt 10 years prior. The results showed that soil respiration was depressed in the burnt site relative to the unburnt control in the woodland 5 years post-fire. A vegetation survey indicated that there substantially less biomass in the burnt site relative to the unburnt site. In the forest site 10 years post-fire there was no significant difference in soil CO$_{2}$ concentration or vegetation between the burnt and control. This demonstrates that soil CO$_{2}$ concentration takes >5 years to recover to pre-fire levels in woodlands and <10 years in subalpine forests and is determined by vegetation recovery. This long-term reduction in soil CO$_{2}$ concentration caused by fire has the potential to affect karst subsurface processes governed by soil CO$_{2}$ which lead to incorrect interpretation of speleothem proxy climate records.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	4
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-02-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Speleothem Fire Carbon dioxide Soil CO$_{2}$ concentration Paleoclimate reconstruction Karst Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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