Is methane released from the forest canopy?
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Is methane released from the forest canopy? / Mikkelsen, T.N.; Bruhn, D.; Ambus, Per Lennart; Larsen, Klaus Steenberg; Ibrom, I.; Pilegaard, K.
I: iForest, Bind 4, 2011, s. 200-204.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Is methane released from the forest canopy?
AU - Mikkelsen, T.N.
AU - Bruhn, D.
AU - Ambus, Per Lennart
AU - Larsen, Klaus Steenberg
AU - Ibrom, I.
AU - Pilegaard, K.
PY - 2011
Y1 - 2011
N2 - Laboratory experiments show that rates of CH(4) emission from plant material depend exponentially on temperature and linearly on UV irradiance. The UV irradiance shall be spectrally weighted and shorter wavelengths results in higher CH(4) emissions. Global upscaling models for estimating aerobic CH(4), based on lab results, have be conducted with varying results, but until now field measurements based on profile and eddy covariance measurements have failed to show CH(4) emissions from forest canopies. To detect CH(4) production or consumption in the canopy of a beech stand we connected a CH(4) analyzer to a canopy air profile system that samples air below and above the canopy from seven different heights. A profile system with many vertical sample points can detect gas concentration gradients with a high sensitivity only under conditions with no or little air movements. Under these conditions we found indications of periodic CH(4) emissions in the canopy, but more data need to be analyzed before the magnitude of the canopy source of CH(4) can be established
AB - Laboratory experiments show that rates of CH(4) emission from plant material depend exponentially on temperature and linearly on UV irradiance. The UV irradiance shall be spectrally weighted and shorter wavelengths results in higher CH(4) emissions. Global upscaling models for estimating aerobic CH(4), based on lab results, have be conducted with varying results, but until now field measurements based on profile and eddy covariance measurements have failed to show CH(4) emissions from forest canopies. To detect CH(4) production or consumption in the canopy of a beech stand we connected a CH(4) analyzer to a canopy air profile system that samples air below and above the canopy from seven different heights. A profile system with many vertical sample points can detect gas concentration gradients with a high sensitivity only under conditions with no or little air movements. Under these conditions we found indications of periodic CH(4) emissions in the canopy, but more data need to be analyzed before the magnitude of the canopy source of CH(4) can be established
KW - AIR
KW - beech
KW - CANOPY
KW - CH(4)
KW - eddy covariance
KW - EDDY COVARIANCE MEASUREMENTS
KW - EMISSION
KW - EMISSIONS
KW - experiment
KW - FIELD
KW - FIELD-MEASUREMENTS
KW - forest
KW - gradient
KW - irradiance
KW - lab
KW - measurement
KW - methane
KW - MODEL
KW - MODELS
KW - NO
KW - PLANT
KW - PLANT-MATERIAL
KW - production
KW - RATES
KW - SENSITIVITY
KW - source
KW - SYSTEM
KW - temperature
U2 - 10.3832/ifor0591-004
DO - 10.3832/ifor0591-004
M3 - Journal article
VL - 4
SP - 200
EP - 204
JO - IForest
JF - IForest
SN - 1971-7458
ER -
ID: 129023298