Congressi Nazionali SISEF

*

Poster

Fodale R, Calfapietra C, Brilli F, Barta C, Fares S, Loreto F, Centritto M

Carbon assimilation and isoprene emission in response to rising temperature and drought in Populus nigra saplings

Riassunto: Isoprene (2-methyl-1,3-butadiene) is one of many biogenic volatile organic compounds (BVOCs) emitted in copious quantities by plants that substantially influence the atmospheric chemistry. The rapid oxidation of isoprene in the atmosphere contributes to the formation of carbon monoxide, ozone, organic nitrates, organic acids, and secondary aerosols. Global Change events such as drought, coupled with rising temperatures may have contrasting effects on biogeochemical carbon cycles, regarding both photosynthestic carbon assimilation and isoprene emission by forests. To improve our understanding on the acclimatory responses of isoprene emission (IE), photosynthesis (A) and respiration (R) to rising temperatures and soil water availability (FASW), one-year-old Populus nigra saplings were exposed to soil water deficit at two different temperatures (25 and 35 C°). IE and A did not acclimate to high temperatures. In well-watered non-stressed plants, high temperature doubled IE and decreased A by 30%, whereas R acclimated to high temperatures showing a not significant increase of only 15%. Moreover, plant photosynthetic activity started to decrease at FASW of ~75% and ~85% at 25°C and 35°C respectively. Drought did increase the IE to A ratio, because IE was less responsive to drought than A at the two different temperatures. Consequently, the portion of assimilated carbon lost as isoprene always increases as water stress progressed. We conclude that future warmer and drier climate will 1) significantly increase tropospheric isoprene load depending on the severity of drought, and 2) strongly reduce photosynthetic carbon assimilation.

Citazione: Fodale R, Calfapietra C, Brilli F, Barta C, Fares S, Loreto F, Centritto M (2007). Carbon assimilation and isoprene emission in response to rising temperature and drought in Populus nigra saplings. In: VI Congresso Nazionale SISEF “La gestione delle foreste tra cambiamenti globali e azioni locali“ (CRA-ISSAR, Arezzo 25-27 Settembre 2007), Abstract-book, Contributo #c06.8.13. - [online] URL: https://congressi.sisef.org/?action=paper&id=1641


Dettagli

Congresso VI Congresso Nazionale SISEF
“La gestione delle foreste tra cambiamenti globali e azioni locali”
CRA-ISSAR, Arezzo 25-27 Settembre 2007
Collocazione c06.8.13 (#)
Sessione Sessione Poster 04
Moderatore/i -
Data Sep 27, 2007
Ora 12:51-12:51
Luogo -
Info Autori
(*): speaker

R Fodale
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy

C Calfapietra
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy

F Brilli
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy

C Barta
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy

S Fares
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy

F Loreto
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy

M Centritto
CNR - Istituto di Biologia Agroambientale e Forestale, Via Salaria km 29.300, 00016 Monterotondo Scalo (Roma), Italy
Italy