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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Comparison between AOT40 and ozone uptake in forest trees of different species, age and site conditions.
Atmos. Environ. 38, 2271-2281 (2004)
The current AOT40 concept for inferring risks in forest trees by ozone (O-3) injury is based on an accumulated external O-3 exposure rather than an internal O-3 dose or uptake rate. AOT40 assumes O-3 concentrations below 40 nl l(-1) and night-time exposure to be negligible. Hence, this concept is rather inconsistent with observed forest conditions. In contrast, the flux concept of cumulative O-3 uptake (CU) into the leaves has the potential of reflecting a physiologically meaningful internal O-3 dose experienced by trees. In this paper, we relate AOT40 to cumulative O-3 uptake into European beech (Fagus sylvatica), Norway spruce (Picea abies), European larch (Larix decidua) and cembran pine (Pinus cembra) trees differing in size, age and site conditions. We demonstrate that the flux concept can be extended to the tree and the stand level, making use of sap flow measurements through tree trunks. Although in both seedlings and adult trees AOT40 may show some linearity in correlations with average CU, the latter varies, at given AOT40, by 25 +/- 11% within and between species. This is because O-3 flux is primarily influenced by stomatal aperture, the latter being affected by climate, canopy position, leaf and tree age while varying between species. In particular, if weighed by detoxification capacity, we suggest, therefore, O-3 uptake related air quality indices to be promoted towards ecologically meaningful standards in forest protection, overcoming the shortcomings of exposure concepts. As O-3 injury results from the balance between O-3 uptake and detoxification in the leaf mesophyll, we conclude the flux concept in combination with measures of biochemical defence to have the capacity for predicting tree response to O-3 stress.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Fagus sylvatica; Picea abies; Larix deciduas; Pinus cembra; Ozone; AOT40; O3 uptake; Stomatal conductance; Sap flow
ISSN (print) / ISBN
1352-2310
e-ISSN
1873-2844
Zeitschrift
Atmospheric Environment
Quellenangaben
Band: 38,
Heft: 15,
Seiten: 2271-2281
Verlag
Elsevier
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Research Unit Environmental Simulation (EUS)