Journal of Environmental Biology

Instantaneous and historical temperature effects on a-pinene

emissions in Pinus halepensis and Quercus ilex

Author Details

Josep-Salvador Blanch (Corresponding author)

Ecophysiology and Global Change Unit CREAF-CEAB-CSIC, Center for Ecological Research and

?Forestry Applications, Universitat Aut?noma de Barcelona - 08193, Bellaterra, Catalonia, Spain

e-mail: js.blanch@creaf.uab.cat

Joan Llusia^????

Ecophysiology and Global Change Unit CREAF-CEAB-CSIC, Center for Ecological Research and Forestry Applications, Universitat Aut?noma de Barcelona - 08193, Bellaterra, Catalonia, Spain

Ulo Niinemets

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi, Tartu - 51014, Estonia

Steffen M. Noe

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi, Tartu - 51014, Estonia

Josep Penuelas

Ecophysiology and Global Change Unit CREAF-CEAB-CSIC, Center for Ecological Research and Forestry Applications, Universitat Aut?noma de Barcelona - 08193, Bellaterra, Catalonia, Spain

Publication Data

Paper received:

26 May 2009

Revised received:

30 January 2010

Re-revised received:

06 March 2010

Abstract

We compared the role of instantaneous temperature and temperature history in the determination of a-pinene emissions in Mediterranean conifer Pinus halepensis that stores monoterpenes in resin ducts, and in Mediterranean broad-leaved evergreen Quercus ilex that lacks such specialized storage structures. In both species, a-pinene emission rates (E) exhibited a significant exponential correlation with leaf temperature and the rates of photosynthetic electron transport (J_CO2+_O2) started to decrease after an optimum at approximately 35^oC. However, there was a higher dependence of E on mean temperature of previous days than on mean temperature of current day for P. halepensis but not for Q. ilex. J_CO2+_O2 showed a maximum relationship to mean temperature of previous 3 and 5 days for P. halepensis and Q. ilex respectively. We conclude that although the best correlation of emission rates were found for instantaneous foliar temperatures, the effect of accumulated previous temperature conditions should also be considered in models of monoterpene emission, especially for terpene storing species.

Key words

Acclimation, Emission model, Quercus ilex, Pinus halepensis, Previous climate effects

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