Formaldehyde emission and uptake by Mediterranean trees Quercus ilex and Pinus halepensis
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Formaldehyde emission and uptake by Mediterranean trees Quercus ilex and Pinus halepensis. / Seco, Roger; Peñuelas, Josep; Filella, Iolanda.
I: Atmospheric Environment, Bind 42, Nr. 34, 2008, s. 7907-7914.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Formaldehyde emission and uptake by Mediterranean trees Quercus ilex and Pinus halepensis
AU - Seco, Roger
AU - Peñuelas, Josep
AU - Filella, Iolanda
PY - 2008
Y1 - 2008
N2 - Formaldehyde (FA) is an ubiquitous gas in the atmosphere which reaches notable concentrations in polluted areas and can have great impact on human health. We studied FA exchange between air and two widespread Mediterranean tree species, Quercus ilex and Pinus halepensis. Experiments were conducted at the leaf level under laboratory conditions using air from outside the building. In both plant species FA exchange was mainly determined by the atmospheric mixing ratios, with a compensation point calculated around 20 ppbv. Higher values led to uptake and lower values to emission. The second factor that regulated FA exchange was stomatal conductance. FA exchange followed a diurnal cycle with the greatest exchange when stomatal conductance was at maximum. Such stomatal control is consistent with previous studies and is probably due to the high water solubility of FA, resulting in stomatal transpiration being its main exchange pathway. We also observed this relationship between stomatal conductance and FA exchange under conditions of drought and posterior rewatering, in which changes in stomatal conductance were paralleled by changes in FA exchange. Under projected future conditions of enhanced aridity in the Mediterranean, drought-driven limitations of FA exchange may be more relevant.
AB - Formaldehyde (FA) is an ubiquitous gas in the atmosphere which reaches notable concentrations in polluted areas and can have great impact on human health. We studied FA exchange between air and two widespread Mediterranean tree species, Quercus ilex and Pinus halepensis. Experiments were conducted at the leaf level under laboratory conditions using air from outside the building. In both plant species FA exchange was mainly determined by the atmospheric mixing ratios, with a compensation point calculated around 20 ppbv. Higher values led to uptake and lower values to emission. The second factor that regulated FA exchange was stomatal conductance. FA exchange followed a diurnal cycle with the greatest exchange when stomatal conductance was at maximum. Such stomatal control is consistent with previous studies and is probably due to the high water solubility of FA, resulting in stomatal transpiration being its main exchange pathway. We also observed this relationship between stomatal conductance and FA exchange under conditions of drought and posterior rewatering, in which changes in stomatal conductance were paralleled by changes in FA exchange. Under projected future conditions of enhanced aridity in the Mediterranean, drought-driven limitations of FA exchange may be more relevant.
KW - Biogenic
KW - Drought
KW - Emission
KW - Formaldehyde
KW - oxVOCs
KW - Pinus halepensis
KW - Quercus ilex
KW - Uptake
U2 - 10.1016/j.atmosenv.2008.07.006
DO - 10.1016/j.atmosenv.2008.07.006
M3 - Journal article
AN - SCOPUS:53249105334
VL - 42
SP - 7907
EP - 7914
JO - Atmospheric Environment
JF - Atmospheric Environment
SN - 1352-2310
IS - 34
ER -
ID: 234283016