Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire
Peatlands store one-third of soil C in terrestrial ecosystems and have persisted through changing climate over millennia from the arctic to the tropics. Approximately one-third of peat stores are found in subtropical and tropical peatlands (STPs) formed from high-lignin woody biomass. In this projec...
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ftosti:oai:osti.gov:1488733 2023-07-30T04:02:09+02:00 Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire Richardson, Curtis John Flanagan, Neal Wang, Hongjun Ho, Mengchi Chanton, Jeff Cooper, Bill 2019-06-14 application/pdf http://www.osti.gov/servlets/purl/1488733 https://www.osti.gov/biblio/1488733 https://doi.org/10.2172/1488733 unknown http://www.osti.gov/servlets/purl/1488733 https://www.osti.gov/biblio/1488733 https://doi.org/10.2172/1488733 doi:10.2172/1488733 59 BASIC BIOLOGICAL SCIENCES 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES 2019 ftosti https://doi.org/10.2172/1488733 2023-07-11T09:30:40Z Peatlands store one-third of soil C in terrestrial ecosystems and have persisted through changing climate over millennia from the arctic to the tropics. Approximately one-third of peat stores are found in subtropical and tropical peatlands (STPs) formed from high-lignin woody biomass. In this project, our questions are: 1) why do these non-sphagnum peatlands (STPs) accumulate C under warmer-drier climates and 2) how might insights coming from studying control mechanisms in STPs improve the management and conservation of the vast C stores in boreal peatlands subject to increasing climate forcing. We hypothesized that a dual control or “latch mechanism” reduces decomposition in shrub/tree communities in STPs due to both (1) higher production of polyphenol and aromatic compounds in STPs than found in northern Sphagnum/Carex communities and (2) the buildup of recalcitrant organic matter produced by light fire-drought-warming-adapted communities, together leading to a reduction in the microbial decay rate of peat. After three-years of intensive biological and chemical analysis in a series of field and microcosm experiments along our north to south bog gradient from Minnesota to Peru, we show how previously unrecognized biotic factors, particularly dynamic interlinked above- and belowground attributes control C sequestration in peatlands. Our key findings include (1) phenolics-bridged plant-microbe symbioses, principally slow-growing microbes dominated in higher phenolic wooded STPs, preserving C in peatlands under climate change, 2) phenolics are the overarching factor controlling the relative abundance of slow-and fast-growing microbes, the slow-growing microbes in STPs metabolize C slowly and are inherently resistant to disturbance, 3) global data analysis shows that soil respiration does not increase exponentially from boreal to tropical peatlands, suggesting that slow-growing microbes may have become dominant in most non-boreal peatlands, 4) peat chemistry analysis from over 2000 samples show that across ... Other/Unknown Material Arctic black carbon Climate change SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
59 BASIC BIOLOGICAL SCIENCES 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES |
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59 BASIC BIOLOGICAL SCIENCES 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES Richardson, Curtis John Flanagan, Neal Wang, Hongjun Ho, Mengchi Chanton, Jeff Cooper, Bill Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
topic_facet |
59 BASIC BIOLOGICAL SCIENCES 54 ENVIRONMENTAL SCIENCES 58 GEOSCIENCES |
description |
Peatlands store one-third of soil C in terrestrial ecosystems and have persisted through changing climate over millennia from the arctic to the tropics. Approximately one-third of peat stores are found in subtropical and tropical peatlands (STPs) formed from high-lignin woody biomass. In this project, our questions are: 1) why do these non-sphagnum peatlands (STPs) accumulate C under warmer-drier climates and 2) how might insights coming from studying control mechanisms in STPs improve the management and conservation of the vast C stores in boreal peatlands subject to increasing climate forcing. We hypothesized that a dual control or “latch mechanism” reduces decomposition in shrub/tree communities in STPs due to both (1) higher production of polyphenol and aromatic compounds in STPs than found in northern Sphagnum/Carex communities and (2) the buildup of recalcitrant organic matter produced by light fire-drought-warming-adapted communities, together leading to a reduction in the microbial decay rate of peat. After three-years of intensive biological and chemical analysis in a series of field and microcosm experiments along our north to south bog gradient from Minnesota to Peru, we show how previously unrecognized biotic factors, particularly dynamic interlinked above- and belowground attributes control C sequestration in peatlands. Our key findings include (1) phenolics-bridged plant-microbe symbioses, principally slow-growing microbes dominated in higher phenolic wooded STPs, preserving C in peatlands under climate change, 2) phenolics are the overarching factor controlling the relative abundance of slow-and fast-growing microbes, the slow-growing microbes in STPs metabolize C slowly and are inherently resistant to disturbance, 3) global data analysis shows that soil respiration does not increase exponentially from boreal to tropical peatlands, suggesting that slow-growing microbes may have become dominant in most non-boreal peatlands, 4) peat chemistry analysis from over 2000 samples show that across ... |
author |
Richardson, Curtis John Flanagan, Neal Wang, Hongjun Ho, Mengchi Chanton, Jeff Cooper, Bill |
author_facet |
Richardson, Curtis John Flanagan, Neal Wang, Hongjun Ho, Mengchi Chanton, Jeff Cooper, Bill |
author_sort |
Richardson, Curtis John |
title |
Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
title_short |
Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
title_full |
Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
title_fullStr |
Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
title_full_unstemmed |
Phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
title_sort |
phenolic compounds and black carbon feedback controls on peat decomposition and carbon accumulation in southeastern peatlands under regimes of seasonal drought, drainage and frequent fire |
publishDate |
2019 |
url |
http://www.osti.gov/servlets/purl/1488733 https://www.osti.gov/biblio/1488733 https://doi.org/10.2172/1488733 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic black carbon Climate change |
genre_facet |
Arctic black carbon Climate change |
op_relation |
http://www.osti.gov/servlets/purl/1488733 https://www.osti.gov/biblio/1488733 https://doi.org/10.2172/1488733 doi:10.2172/1488733 |
op_doi |
https://doi.org/10.2172/1488733 |
_version_ |
1772812884351385600 |