Description: Ziel des Projekt ist es, Wechselwirkungen erhoehter UV-Strahlung und variabler Stickstoffversorgung im Boden bei verschiedenen, landwirtschaftlichen bedeutenden Nutzpflanzen zu untersuchen. Die Untersuchungen werden auf der Blatt-, Pflanzen- und Pflanzengesellschaftsebene durchgefuehrt. Die Ergebnisse sollen Vorhersagen fuer den Duengerbedarf europaeischer Boeden bei verschiedenen Ozonabbauszenarien liefern.
Types:
SupportProgram
Tags:
Karlsruhe
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Ozon
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Protein
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Antagonistische Wirkung
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Chlorophyll
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Methanol
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Antwerpen
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Kombinationswirkung
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Pigment
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Transpiration
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UV-Strahlung
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Absorption
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Nutzpflanze
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Ackerfläche
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Atmung
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Düngung
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Pflanzengesellschaft
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Europa
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Abbau
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Kenngröße
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Landwirtschaft
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Pflanzenwachstum
?
Region:
Baden-Württemberg
Baden-Württemberg
Bounding boxes:
7.5117461° .. 10.4956269° x 47.532401199999995° .. 49.791294099999995°
7.511871829803615° .. 10.495748779340031° x 47.53236022054888° .. 49.79147764979833°
License: Creative Commons Namensnennung-keine Bearbeitung-Nichtkommerziell 4.0
Language: Deutsch
Organisations
Last harvest: 17.09.2026 23:39
Time ranges:
1992-07-01 - 1995-06-30
Alternatives
-
Language: Englisch/English
Title: Synergism and/or Antagonism of Enhanced (Reduced) UV-B Radiation and Variable Nitrogen Supply (Normal, Reduced and Enhanced) in Crop Plants
Description: The study will be completed on four levels: I) Leaf and plant level - the biochemistry and physiology of plant responses to N supply and UV-B, II) Crop level - the connection of canopy architecture and UV-B interception will be studied for various levels of N supply. III) Establishment of ambient UV-B fluxes at Antwerpen and Karlsruhe. IV) Modelling the likely effects of UV-B radiation on crops under various ozone-depletion scenarios. In Karlsruhe, bean, maize, rye, and sunflower plants will be selected, cultivated, and screened for sensitivity to UV-B and to Nitrogen supply. Outdoor experiments will be performed in temperature-controlled greenhouses covered with UV-transparent plexiglass of different thicknesses (3mm and 5mm) to obtain different UV-B irradiances. The use of the plexiglass will result in an absolute solar UV-B radiation difference of about 8 percent and a biologically effective radiation difference of about 16 percent. Indoor, UV-B irradiances will be applied in growth chambers. The two most sensitive species of plant will be used in further experiments. The following growth parameters will be determined: plant height, stem thickness, area of the cotyledons and the leaves, thickness of the cotyledons and leaves, fresh and dry weight. Based on these values, the specific growth parameters stem elongation rate, specific leaf weight, and relative growth rate will be computed. The growth kinetics will be measured and the photosynthetic pigments (chlorophyll and carotinoids) quantified. Protein and protective pigment contents (flavonoids) will also be determined. At Antwerpen, young bean and rye plants, sensitive to UV-B, will be selected, cultivated, and irradiated with various levels of UV-B both indoors and outdoors. Parameters which will be examined include the following: I) Fresh and dry weight of the plant components, leaf area, thickness color and N-content, and plant height; II) Photosynthesis, photosynthesis/light curves, transpiration and dark respiration of single leaves; III) Absorption spectra of freshly-cut leaves and leaves extracted in H2O/HCI/methanol (for flavonoids); IV) The data obtained in the experiments above will be correlated with the chlorophyll concentration. Older canopies will be analyzed with an additional set of experiments. Leaf-angle distribution will be fitted to a gamma-distribution (allowing incorporation in models), leaf area distribution will be measured, and light penetration in the canopy will be registered at different heights in the canopy. In addition, the other experiments will be repeated on leaves at different heights in the canopy. The UV-B and visible-light fluxes at Karlsruhe and Antwerpen will be monitored daily. Calculation of the weighted UV-B radiation with commonly used weighting functions will be made. Some modelling will also be performed, simulating UV-B fluxes under various weather conditions for different ozone-depletion scenarios. Comparison of absolute and ....
URL: https://ufordat.uba.de/UFORDAT/pages/PublicRedirect.aspx?TYP=PR&DSNR=52215
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