Description: Das Projekt "The Carbon Sink Strength of Beech in a Changing Environment: Experimental Risk Assessment of Mitigation by Chronic Ozone Impact (CASIROZ)" wird vom Umweltbundesamt gefördert und von Technische Universität München, Wissenschaftszentrum Weihenstephan für Ernährung, Landnutzung und Umwelt, Department Ökologie, Lehrstuhl für Ökophysiologie der Pflanzen durchgeführt. The project aims at clarifying the vulnerability of adult beech trees, growing under Central-European stand conditions, to the tropospheric, chronic ozone (O3) impact. O3 as being part of 'Global Change may constrain the carbon sink strength of trees under the expected atmospheric CO2 enrichment. A novel 'Free-Air Canopy O3 Exposure' system, creating an experimentally enhanced O3regime within the canopy (relative to 'control' trees in unchanged air), is employed for analyzing O3-induced responses that are relevant for the carbon balance and CO2 demand of the trees. For relating tree performance to effective O3 doses rather than O3 exposure, the O3 flux concept into leaves will be examined and validated against AOT40. Response patterns will be assessed, integrating the cell, organ and whole-tree level, while making use of molecular, biochemical and ecophysiological methodologies. In addition, branch cuvette fumigations and exposure of young beech plants inside the stand canopy will validate the ecological significance of former O3 studies in phytotrons, open-top chambers or on single branches in tree crowns. Evidence will be incorporated into mechanistic modeling for scaling to the stand level and quantifying O3 impact for 'Global Change' scenarios. This process-oriented risk assessment will guide environmental policy making. The objective is to assess the vulnerability of adult beech trees to the ground level, chronic O3 impact by employing a novel 'Free-Air Canopy O3 Exposure' system that experimentally enhances the O3 exposure within the forest canopy. Ozone is viewed as one component in 'Global Change' scenarios in that it may mitigate the supposed increases in productivity under elevated CO2 conditions by reducing the carbon sink strength of trees and forests. This issue is regarded relevant, as recent experiments suggest such an antagonistic interaction between ozone and CO2 in plant performance. Prognoses indicate further increase in chronic, ground level O3 exposure to occur during the 21st century across the northern hemisphere, and deficits in knowledge are still significant, in particular regarding the responsiveness of advanced tree age and current O3 threshold definitions like AOT40. (...) The major outcome of this study will be the elaboration of a database needed for the management of trees and stands under the chronic, enhanced ground level O3 regimes. This includes mechanistic knowledge regarding threshold definitions of O3 flux (uptake) rather than exposure. The most important relevance of the elaborated results will be for the UNECE Level II and III concepts about 'Critical Levels for Ozone and the UNECE ICP-Forests. In particular, impacts on practical development strategies will be (1) evaluation tools to assess modifications of the CO2 sink strength of forests due to additional impacts, in the present case ozone (cf. Kyoto protocols) and (2) quantification of factors modifying the O3 effect on adult beech forest trees, Etc.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: München ? Buche ? Ozon ? Antagonistische Wirkung ? Baumkrone ? Ökophysiologie ? Pflanzenökologie ? Waldbaum ? Kyoto ? Baum ? Critical Level ? Ökologie ? Kyoto-Protokoll ? Kohlendioxid ? Kohlenstoffbilanz ? Laubblatt ? Kohlenstoffsenke ? Szenario ? Prognose ? Luft ? Erwachsener ? Globale Veränderung ? AOT40 ? Dosis ? Exposition ? Flächennutzung ? Management ? Pflanzenernährung ? Studie ? Wirkungsanalyse ? Zelle ? Flachland ? Lebensalter ? Modellierung ? Wirkung ? Anreicherung ? Bedarf ? Begasung ? Datenbank ? Organ ? Produktivität ? Risiko ? Schwellenwert ? Umwelt ? Umweltpolitik ? Wald ? Globale Aspekte ? Bewertung ? Änderung ? Strategische Aspekte ? Risikobewertung ? EXPERIMENT ? SICHT ? TEIL ? FREI ? BESTIMMUNG ? BEWERTEN ? BEZUG ? KONTROLLE ? UNTER ? LEISTUNGSFAEHIGKEIT ? VERANTWORTUNG ? Bepflanzung ? Laub ? METHODIK ? EHEMALIG ? VERARBEITEN ? VERHAELTNIS ? VERWANDT ? Vermehrung ? NACHFRAGE ? EIN ? EINSATZ ? ENTWICKLUNG ? WICHTIG ? NEU ? ERGEBNIS ? BAEUME ? NOERDLICH ? PROJEKT ? Produktivitätssteigerung ? BESTANDTEIL ? Werkzeug ? FORTSCHRITTLICH ?
Region: Bayern
Bounding box: 12.53381° .. 12.53381° x 47.795° .. 47.795°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2002-10-01 - 2006-01-31
Webseite zum Förderprojekt
http://www.casiroz.de/ (Webseite)Accessed 1 times.