http://www.cnr.it/ontology/cnr/individuo/prodotto/ID41011
Comparison of calculated and measured foliar O3 flux in crop and forest species. (Articolo in rivista)
- Type
- Label
- Comparison of calculated and measured foliar O3 flux in crop and forest species. (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Grulke N.E., Paoletti E., Heath R.L. (literal)
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- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- -Paoletti E., Istituto per la Protazione delle Piante, CNR, Firenze
-Grulke N.E., USDA Forest Service, 4955 Canyon Crest Drive, Riverside, CA 92507, USA
-Heath R.L., Botany and Plant Sciences Department, University of California, Riverside, CA 92521, USA
(literal)
- Titolo
- Comparison of calculated and measured foliar O3 flux in crop and forest species. (literal)
- Abstract
- We designed a new gas exchange system that concurrently measures foliar H2O, O3, and CO2 flux (HOC flux system) while delivering known O3 concentrations. Stomatal responses of three species were tested: snapbean, and seedlings of California black oak (deciduous broadleaf) and blue oak (evergreen broadleaf). Acute O3 exposure (120250 ppb over an hour) was applied under moderate light and low vapor pressure deficits during near steady state conditions. The rate of stomatal closure was measured when the whole plant was placed in the dark. An adjacent leaf on each plant was also concurrently measured in an O3-free cuvette. Under some conditions, direct measurements and calculated foliar O3 flux were within the same order of magnitude; however, endogenously low gs or O3 exposure-induced depression of gs resulted in an overestimation of calculated O3 fluxes compared with measured O3 fluxes. Sluggish stomata in response to light extinction with concurrent O3 exposure, and incomplete stomatal closure likewise underestimated measured O3 flux.
Using a new system to concurrently measure H2O, O3, and CO2 flux, the conventional method of calculating O3 flux generally overestimated direct measures by 2550%. (literal)
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