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Characterization of Natural and Affected Environments
Urban trees are sinks for soot: elemental carbon accumulation by two widespread oak species Jenna Rindy, Alexandra Ponette-Gonzalez, Tate E Barrett, Rebecca J. Sheesley, and Kathleen C. Weathers Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.9b02844 • Publication Date (Web): 12 Aug 2019 Downloaded from pubs.acs.org on August 20, 2019
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Urban trees are sinks for soot: elemental carbon accumulation by two widespread oak
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species
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Running head: Urban trees are sinks for soot
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Jenna E. Rindy1, Alexandra G. Ponette-González1*†, Tate E. Barrett1, Rebecca J. Sheesley2,
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Kathleen C. Weathers3
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1Department
of Geography and the Environment, University of North Texas, 1155 Union Circle
#305279, Denton, Texas 76203, USA
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2Department
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76798, USA
of Environmental Science, Baylor University, 1 Bear Place #97266, Waco, Texas
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3Cary
Institute of Ecosystem Studies, Box AB, Millbrook, New York 12545, USA
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*Corresponding author: A.G. Ponette-González, tel. +1 940 565 4012, e-mail:
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[email protected] 19 20
Keywords (6-10): air quality, black carbon, cities, climate change, litterfall, urban forestry
21 †J.E.
Rindy and A.G. Ponette-González contributed equally to this work and should be
considered joint first author.
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Abstract
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Urban trees could represent important short- and long-term landscape sinks for elemental
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carbon (EC). Therefore, we quantified foliar EC accumulation by two widespread oak tree
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species––Quercus stellata (post oak) and Quercus virginiana (live oak)––as well as leaf litterfall
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EC flux to soil from April 2017 to March 2018 in the City of Denton, Texas, within the Dallas-
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Fort Worth metropolitan area. Post oak trees accumulated 1.9-fold more EC (299 ± 45 mg EC m-
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2
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these oak species converged in their EC accumulation rates, with ~70% of annual accumulation
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occurring during fall and on leaf surfaces. The flux of EC to the ground via leaf litterfall
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mirrored leaf-fall patterns, with post oaks and live oaks delivering ~60% of annual leaf litterfall
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EC in fall and early spring, respectively. We estimate that post oak and live oak trees in this
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urban ecosystem potentially accumulate 3.5 t EC yr-1, equivalent to ~32% of annual vehicular
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EC emissions from the city. Thus, city trees are significant sinks for EC and represent potential
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avenues for climate and air quality mitigation in urban areas.
canopy yr-1) compared to live oak trees (160 ± 31 mg EC m-2 canopy yr-1). However, in the fall,
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Introduction Urban areas cover
