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Changes in pigment concentration and composition in Norway spruce induced by long-term exposure to low levels of ozone.
1995
Mikkelsen T.N. | Dodell B. | Lutz C.
Measurement of dry deposition to vegetative surfaces.
1986
Dasch J.M.
Altered stomatal dynamics of two Euramerican poplar genotypes submitted to successive ozone exposure and water deficit
2019
Dusart, Nicolas | Vaultier, Marie-Noëlle | Olry, Jean-Charles | Buré, Cyril | Gérard, Joëlle | Jolivet, Yves | Le Thiec, Didier | SILVA (SILVA) ; Institut National de la Recherche Agronomique (INRA)-AgroParisTech-Université de Lorraine (UL) | ANR-12-LABXARBRE-01
The impact of ozone (O3) pollution events on the plant drought response needs special attention because spring O3 episodes are often followed by summer drought. By causing stomatal sluggishness, O3 could affect the stomatal dynamic during a subsequent drought event. In this context, we studied the impact of O3 exposure and water deficit (in the presence or in the absence of O3 episode) on the stomatal closure/opening mechanisms relative to irradiance or vapour pressure deficit (VPD) variation. Two genotypes of Populus nigra x deltoides were exposed to various treatments for 21 days. Saplings were exposed to 80 ppb/day O3 for 13 days, and then to moderate drought for 7 days. The curves of the stomatal response to irradiance and VPD changes were determined after 13 days of O3 exposure, and after 21 days in the case of subsequent water deficit, and then fitted using a sigmoidal model. The main responses under O3 exposure were stomatal closure and sluggishness, but the two genotypes showed contrasting responses. During stomatal closure induced by a change in irradiance, closure was slower for both genotypes. Nonetheless, the genotypes differed in stomatal opening under light. Carpaccio stomata opened more slowly than control stomata, whereas Robusta stomata tended to open faster. These effects could be of particular interest, as stomatal impairment was still present after O3 exposure and could result from imperfect recovery. Under water deficit alone, we observed slower stomatal closure in response to VPD and irradiance, but faster stomatal opening in response to irradiance, more marked in Carpaccio. Under the combined treatment, most of the parameters showed antagonistic responses. Our results highlight that it is important to take genotype-specific responses and interactive stress cross-talk into account to improve the prediction of stomatal conductance in response to various environmental modifications.
显示更多 [+] 显示较少 [-]Physiological ozone responses of birch (Betula pendula Roth) differ between soil-growing trees in a multi-year exposure and potted saplings in a single-season exposure
2002
Oksanen, E. (University of Kuopio, Kuopio (Finland). Department of Ecology and Environemntal Science)
Increased ozone sensitivity of larger soil-growing trees with growth in the multi-year exposure was a result of several interactive senescence-related physiological factors: lower net photosynthesis to stomatal conductance ratio at the end of the growing season promoted high ozone uptake and low photosynthetic carbon gain, leading to onset of visible injuries and impaired bud formation. This was expected to affect negatively the early growth of the next year foliage, This clone showed a major change in allocation pattern during the early ontogeny at the expense of foliage growth towards the stem height increase
显示更多 [+] 显示较少 [-]Pruning residues and sewage sludge co-composting
1993
Arbiol, M. | Benito, P. | Soliva, M. | Villalba, D. | Molina, N. (JARFELS SA, Castelldefels (Spain))
[Pollens: geographical distribution and temporal evolution (France)] | Les pollens: distribution geographique et evolution temporelle (France)
2000
Thibaudon, M. (Reseau National de Surveillance Aerobiologique, Saint Clement les Places (France))
Photochemical oxidant pollution and vegetation: effects of mixtures of gases, fog and particles
1989
Olszyk, D.M. | Bytnerowicz, A. | Takemoto, B.K. (Statewide Air Pollution Research Center, University of California, Riverside, CA 92521 (USA))
Two methods to determine plant responses to pollutant mixtures
1989
Chappelka, A.H. | Chevone, B.I. (School of Forestry and Alabama Agricultural Experiment Station, White Smith Hall, Auburn University, AL 36849-5418 (USA))
[Tree conservation measures from the view of wood biology]
1988
Liese, W. (Hamburg Univ. (Germany, F.R.). Ordinariat fuer Holzbiologie)
[Effects of soil conservation on trees of the city of Hamburg damaged by deicing salt]
1988
Pfeiffer, E. (Hamburg Univ. (Germany, F.R.). Ordinariat fuer Bodenkunde)