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Seasonal and diurnal variations of plant isoprenoid emissions from two dominant species in Mediterranean shrubland and forest submitted to experimental drought.

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Title: Seasonal and diurnal variations of plant isoprenoid emissions from two dominant species in Mediterranean shrubland and forest submitted to experimental drought.
Authors: Mu, Zhaobin1,2 zhaobin@creaf.uab.cat, Llusià, Joan1,2, Liu, Daijun1,2, Ogaya, Romà1,2, Asensio, Dolores1,2, Zhang, Chao1,2, Peñuelas, Josep1,2
Source: Atmospheric Environment. Oct2018, Vol. 191, p105-115. 11p.
Subjects: Isopentenoids, Droughts, Shrublands, Emissions (Air pollution), Rainfall
Geographic Terms: Mediterranean Region
Abstract: Abstract We tested the effect of increasing drought conditions in the Mediterranean Basin on isoprenoid emissions for the coming decades by analyzing their effect experimentally on the dominant Mediterranean species Erica multiflora in a Garraf shrubland and Quercus ilex in a Prades forest in Catalonia (Spain). Drought was simulated in Garraf using automatically sliding curtains to decrease the amount of soil moisture by 5% and in Prades by partial rainfall exclusion and runoff exclusion for a 25% decrease. We measured photosynthetic rates (A), stomatal conductance (g s) and rates of isoprenoid emission in the morning and at midday for four seasons and determined the relationship of emission rates with environmental conditions. Terpenes were emitted by both species, but only E. multiflora emitted isoprene. α-Pinene and limonene were the most abundant terpenes. Isoprenoid emissions increased with air temperature and generally decreased as the amount of soil moisture increased. The results of this study suggest that higher isoprenoid emissions can be expected in the warmer and drier conditions predicted for the coming decades in the Mediterranean region. Highlights • We determined the plant gas exchange responses to abiotic seasonal and diurnal factors in the Mediterranean region. • We focused on plant responses to drought by increasing the drought conditions experimentally. • Isoprenoid emissions generally increased under moderate drought. • The obtained data improve the algorithms of the current models of isoprenoid emissions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Abstract We tested the effect of increasing drought conditions in the Mediterranean Basin on isoprenoid emissions for the coming decades by analyzing their effect experimentally on the dominant Mediterranean species Erica multiflora in a Garraf shrubland and Quercus ilex in a Prades forest in Catalonia (Spain). Drought was simulated in Garraf using automatically sliding curtains to decrease the amount of soil moisture by 5% and in Prades by partial rainfall exclusion and runoff exclusion for a 25% decrease. We measured photosynthetic rates (A), stomatal conductance (g s) and rates of isoprenoid emission in the morning and at midday for four seasons and determined the relationship of emission rates with environmental conditions. Terpenes were emitted by both species, but only E. multiflora emitted isoprene. α-Pinene and limonene were the most abundant terpenes. Isoprenoid emissions increased with air temperature and generally decreased as the amount of soil moisture increased. The results of this study suggest that higher isoprenoid emissions can be expected in the warmer and drier conditions predicted for the coming decades in the Mediterranean region. Highlights • We determined the plant gas exchange responses to abiotic seasonal and diurnal factors in the Mediterranean region. • We focused on plant responses to drought by increasing the drought conditions experimentally. • Isoprenoid emissions generally increased under moderate drought. • The obtained data improve the algorithms of the current models of isoprenoid emissions. [ABSTRACT FROM AUTHOR]
ISSN:13522310
DOI:10.1016/j.atmosenv.2018.08.010