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Pyrogenic Carbon Generation From Fire and Forest Restoration Treatments

DeLuca, Thomas H. and Gundale, Michael and Brimmer, Rachel J. and Gao, Si (2020). Pyrogenic Carbon Generation From Fire and Forest Restoration Treatments. Frontiers in forests and global change. 3 , 24
[Research article]

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Pyrogenic carbon (PyC) is a chemically stable form of carbon (C) generated during fire events and is one of the few legacies of fire recorded in soil; however, the significance of this material as a form of C storage in forest ecosystems has received only limited scientific attention, and currently relatively little is known regarding the quantity of PyC generated during forest restoration efforts that include prescribed (Rx) fire. Quantifying the rate of PyC production during fire events is essential to estimating the potential for ecosystem C storage in forest systems where wildfire is a common natural disturbance and Rx fire is used as a fuel management practice. In this paper, we report on the average mass of PyC formation during wildfire and Rx fire events in forest ecosystems through synthesizing data across 12 published studies; and we report empirical data on the mass of PyC generated in a replicated Rx fire study in a ponderosa pine (Pinus ponderosa) forest ecosystem of the Rocky Mountain West. Our data synthesis showed that PyC (consisting of PyC from downed wood, O horizon, and mineral soil) was, on average, produced at a rate of 5.2 ± 2.5% of biomass exposed to fire in forest ecosystems, and a single wildfire or Rx fire event generated about 2.2 ± 1.7 Mg C ha−1 in the form of PyC. In our empirical study, we collected O horizon and surface mineral soil (0–10 cm) samples from the Fire and Fire Surrogates study plots in western Montana (treatments: control, thin, burn, thin&burn) that was burned in 2002 and analyzed for PyC content using a wet digestion method. The two Rx fire treatments had significantly higher PyC contents in the O horizon compared to the control. In the thin&burn treatment, PyC was formed at a rate of about 12% of total biomass consumed yielding ~2.24 Mg PyC C ha−1 in the O horizon. Mineral soil PyC contents were not affected by Rx fire. Wildfire and Rx fires generate a substantial amount of PyC which initially resides in the O horizon and serves as a stable form of ecosystem C.

Authors/Creators:DeLuca, Thomas H. and Gundale, Michael and Brimmer, Rachel J. and Gao, Si
Title:Pyrogenic Carbon Generation From Fire and Forest Restoration Treatments
Series Name/Journal:Frontiers in forests and global change
Year of publishing :2020
Article number:24
Number of Pages:8
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:black carbon, carbon storage, fire, forest restoration, PyC, pyrogenic carbon
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Type of IDID
ID Code:21752
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:26 Jan 2021 10:34
Metadata Last Modified:26 Jan 2021 10:41

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