|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 5 van 9 gevonden artikelen
| Titel: |
Exposures of field-grown lettuce to geothermal air pollution — photosynthetic and stomatal responses |
| Auteur: |
Shinn, J. H. Clegg, B. R. Stuart, M. L. Thompson, S. E. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 11 (1976) nr. 10-11 pagina's 603-612 |
| Jaar: |
1976 |
| Inhoud: |
Field-grown lettuce was exposed in-situ to a facsimile geothermal gas mixture (15 CO2: 1 H2S: 1 CH4: 2 N2 parts by volume added to air). The objective was to determine the effects of geothermal air pollution on photosynthesis and stomatal diffusion resistance during a three-hour period of exposure. The question was to what degree the extra CO2 might compensate for the phytotoxic effect of H2S during an exposure analogous to fumigation by a typical geothermal power plant plume. The apparent mean values indicate a stimulation of photosynthesis and a relaxation of stomatal resistance at low concentrations. There is no significant depression of photosynthesis until exposure concentrations approach 75 ppm CO2: 5 ppm H2S added to air. The normal variation in photosynthesis is so high (coefficient of variation .5) that it is necessary to take many samples to establish a mean, and this should be considered in designing future experiments. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 5 van 9 gevonden artikelen
| << vorige | volgende >> |