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Original scientific paper

Effects of elevated CO2 on chloroplast pigments of spruce (Picea abies) and beech (Fagus sylvatica) in model ecosystems as modified by provenance, soil type, and nitrogen supply

Astrid Wonisch ; Institute of Plant Physiology, University of Graz, Austria
Michael Tausz ; Institute of Plant Physiology, University of Graz, Austria
Wilfried Weidner ; Institute of Plant Physiology, University of Graz, Austria
Madeleine S. Günthardt-Goerg ; Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
Dieter Grill ; Institute of Plant Physiology, University of Graz, Austria


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Abstract

Young beech (Fagus sylvatica L.) and spruce (Picea abies [L,] Karst.) trees, each from two different provenances, were grown in competition in model ecosystems in open-top chambers for four years. The treatments consisted of elevated concentrations of CO, (370 μL L-1 versus 590 μL L-1), increased wet deposition of nitrogen (7 versus 70 kg N ha-1 y-1) and two different forest soils (acidic versus calcareous). Chloroplast pigments in dark- and light-adapted leaf material sampled in the last year of the experiment were analysed. Differences in pigment composition between provenances were observed only in beech trees. Soil type significantly affected the pigment composition in both species. Trees grown under calcareous conditions had higher contents of chlorophylls, whereas acidic soil conditions caused significantly enhanced levels of ß-carotene and xanthophylls as well as increased values of the xanthophyll de-epoxidation status. For both tree species light-adapted samples had higher carotenoid concentrations and de-epoxidation state values than dark-adapted foliage, whereas neither C02 nor N-treatment affected these parameters. Elevated CO, application induced decreased concentrations of total chlorophyll contents in both species. Nitrogen deposition had no effects on pigment composition neither for spruce nor for beech trees. Interactions between CO, and nitrogen application were not observed for both tree species.

Keywords

carbon dioxide; nitrogen deposition; Picea abies; Fagus sylvatica; soil type,; provenance; pigment composition; de-epoxidation status

Hrčak ID:

160836

URI

https://hrcak.srce.hr/160836

Publication date:

31.12.2001.

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