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Title: Distinguishing 'new' from 'old' organic carbon in reclaimed coal mine sites using thermogravimetry: II. Field validation

Abstract

Thermogravimetry was used under laboratory conditions to differentiate 'new' and 'old' organic carbon (c) by using grass litter, coal, and limestone to represent the different C fractions. Thermogravimetric and derivative thermogravimetry curves showed pyrolysis peaks at distinctively different temperatures, with the peak for litter occurring at 270 to 395{sup o}C, for coal at 415 to 520 {sup o}C, and for limestone at 700 to 785{sup o}C. To validate this method in a field setting, we studied four reforested coal mine sites in Kentucky representing a chronosequence since reclamation: 0 and 2 years located at Bent Mountain and 3 and 8 years located at the Starfire mine. A nonmined mature (approximate to 80 years old) stand at Robinson Forest, Kentucky, was selected as a reference location. Results indicated a general peak increase in the 270 to 395{sup o}C region with increased time, signifying an increase in the 'new' organic matter (OM) fraction. For the Bent Mountain site, the OM fraction increased from 0.03 to 0.095% between years 0 and 2, whereas the Starfire site showed an increase from 0.095 to 1.47% between years 3 and 8. This equates to a C sequestration rate of 2.92 Mg ha{sup -1} yr{sup -1} formore » 'new' OM in the upper 10-cm layer during the 8 years of reclamation on eastern Kentucky reclaimed coal mine sites. Results suggest that stable isotopes and elemental data can be used as proxy tools for qualifying soil organic C (SOC) changes over time on the reclaimed coal mine sites but cannot be used to determine the exact SOC accumulation rate. However, results suggested that the thermogravimetric and derivative thermogravimetry methods can be used to quantify SOC accumulation and has the potential to be a more reliable, cost-effective, and rapid means to determine the new organic C fraction in mixed geological material, especially in areas dominated by coal and carbonate materials.« less

Authors:
; ; ; ;  [1]
  1. University of Kentucky, Lexington, KY (United States). Dept. of Forestry
Publication Date:
OSTI Identifier:
20905908
Resource Type:
Journal Article
Resource Relation:
Journal Name: Soil Science; Journal Volume: 172; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; SOILS; CARBON; LAND RECLAMATION; COAL MINING; THERMAL GRAVIMETRIC ANALYSIS; COAL; LIMESTONE; GRAMINEAE; TREES; REVEGETATION; CARBON SEQUESTRATION; SOIL CHEMISTRY; CARBONATES; BIOLOGICAL ACCUMULATION; BUILDUP

Citation Formats

Maharaj, S., Barton, C.D., Karathanasis, T.A.D., Rowe, H.D., and Rimmer, S.M. Distinguishing 'new' from 'old' organic carbon in reclaimed coal mine sites using thermogravimetry: II. Field validation. United States: N. p., 2007. Web. doi:10.1097/SS.0b013e3180314702.
Maharaj, S., Barton, C.D., Karathanasis, T.A.D., Rowe, H.D., & Rimmer, S.M. Distinguishing 'new' from 'old' organic carbon in reclaimed coal mine sites using thermogravimetry: II. Field validation. United States. doi:10.1097/SS.0b013e3180314702.
Maharaj, S., Barton, C.D., Karathanasis, T.A.D., Rowe, H.D., and Rimmer, S.M. Sun . "Distinguishing 'new' from 'old' organic carbon in reclaimed coal mine sites using thermogravimetry: II. Field validation". United States. doi:10.1097/SS.0b013e3180314702.
@article{osti_20905908,
title = {Distinguishing 'new' from 'old' organic carbon in reclaimed coal mine sites using thermogravimetry: II. Field validation},
author = {Maharaj, S. and Barton, C.D. and Karathanasis, T.A.D. and Rowe, H.D. and Rimmer, S.M.},
abstractNote = {Thermogravimetry was used under laboratory conditions to differentiate 'new' and 'old' organic carbon (c) by using grass litter, coal, and limestone to represent the different C fractions. Thermogravimetric and derivative thermogravimetry curves showed pyrolysis peaks at distinctively different temperatures, with the peak for litter occurring at 270 to 395{sup o}C, for coal at 415 to 520 {sup o}C, and for limestone at 700 to 785{sup o}C. To validate this method in a field setting, we studied four reforested coal mine sites in Kentucky representing a chronosequence since reclamation: 0 and 2 years located at Bent Mountain and 3 and 8 years located at the Starfire mine. A nonmined mature (approximate to 80 years old) stand at Robinson Forest, Kentucky, was selected as a reference location. Results indicated a general peak increase in the 270 to 395{sup o}C region with increased time, signifying an increase in the 'new' organic matter (OM) fraction. For the Bent Mountain site, the OM fraction increased from 0.03 to 0.095% between years 0 and 2, whereas the Starfire site showed an increase from 0.095 to 1.47% between years 3 and 8. This equates to a C sequestration rate of 2.92 Mg ha{sup -1} yr{sup -1} for 'new' OM in the upper 10-cm layer during the 8 years of reclamation on eastern Kentucky reclaimed coal mine sites. Results suggest that stable isotopes and elemental data can be used as proxy tools for qualifying soil organic C (SOC) changes over time on the reclaimed coal mine sites but cannot be used to determine the exact SOC accumulation rate. However, results suggested that the thermogravimetric and derivative thermogravimetry methods can be used to quantify SOC accumulation and has the potential to be a more reliable, cost-effective, and rapid means to determine the new organic C fraction in mixed geological material, especially in areas dominated by coal and carbonate materials.},
doi = {10.1097/SS.0b013e3180314702},
journal = {Soil Science},
number = 4,
volume = 172,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}