Emissions of non-methane organic compounds and carbon dioxide from forest floor cores

Journal Article · · Soil Science Society of America Journal; (United States)

DOI:https://doi.org/10.2136/sssaj1994.03615995005800020043x· OSTI ID:7297295

Hanson, P J ^[1]; Hoffman, W A ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. Denison Univ., Granville, OH (United States)

Forest floor emissions of CO[sub 2] and non-methane volatile organic compounds (NMOCs) were measured to determine their contribution to C losses from forests. Forest floor cores 19 cm in diameter and approximately 10 cm deep were obtained from beneath loblolly pine (Pinus taeda L), oak-maple (Quercus-Acer), and yellow-poplar (Liriodendron tulipifera L) trees on the Walker Branch Watershed, Oak Ridge, TN. The cores were enclosed in an open system gas exchange instrument from which inlet and outlet concentrations of NMOC emissions were sampled. The NMOCs were quantified with a C trap/cryofocus/gas chromatography approach. Total NMOC emissions from the forest floor cores ranged from 15 to 90 nmol C m[sup [minus]2] s[sup [minus]1], and differed beneath each tree species. Cores form beneath yellow-poplar trees had nearly an order of magnitude greater C equivalent efflux than cores from beneath either the pine or oak-maple trees. Monoterpenes comprised virtually all of the NMOC emissions from the cores. The C equivalent efflux of MNOCs from the forest floor cores was one to two orders of magnitude less than rates of CO[sub 2] efflux (4-8 [mu]mol m[sup [minus]2] s[sup [minus]1]), indicating a very minor role for litter and soil NMOC emissions in stand C cycling. 23 refs., 3 figs., 1 tab.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7297295
• Journal Information: Soil Science Society of America Journal; (United States), Journal Name: Soil Science Society of America Journal; (United States) Vol. 58:2; ISSN 0361-5995; ISSN SSSJD4
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
BIOLOGICAL MATERIALS
CARBON COMPOUNDS
CARBON CYCLE
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHROMATOGRAPHY
ENVIRONMENTAL EFFECTS
EVAPORATION
FOREST LITTER
GAS CHROMATOGRAPHY
GLOBAL ASPECTS
LAND POLLUTION
MATERIALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLANTS
POLLUTION
SEPARATION PROCESSES
SOILS
TERPENES
TREES
VOLATILITY