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Photosynthese als Funktion des Chloroplasten

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Pflanzenphysiologie

Part of the book series: Springer-Lehrbuch ((SLB))

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Zusammenfassung

Die universelle Energiequelle der Biosphäre ist die Sonne. Bei den in der Sonne ablaufenden Kernfusionsprozessen wird Materie in Energie umgewandelt (z.B. 4 Protonen → Heliumkern + 2 Positronen + 4,5 · 10−12 J), welche in Form von elektromagnetischer Strahlung (h v) in den Weltraum abgegeben wird. Die Energieverteilung der Sonnenstrahlung entspricht in erster Näherung dem kontinuierlichen Emissionsspektrum eines schwarzen Körpers bei etwa 5800 K. Durch Streuverluste und selektive Absorption von Quanten in der Erdatmosphäre wird das Sonnenspektrum modifiziert (Abb. 12.1), wobei der Energiefluß der Strahlung von 1,4 kW·m−2 (Solarkonstante) auf ≦ 0,9 kW·m−2 (Meeresniveau) reduziert wird. Etwa die Hälfte davon entfällt auf den Spektralbereich von 300–800 nm (das „optische Fenster“ der Atmosphäre; → Abb. 12.1), welcher mitten in dem Bereich photochemisch wirksamer Strahlung (ca. 100–1000 nm) liegt.

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Authors and Affiliations

  1. Lehrstuhl für Botanik, Biologisches Institut II der Universität, Schänzlestraße 1, 7800, Freiburg i. Br., Deutschland

    Professor Dr. Hans Mohr & Professor Dr. Peter Schopfer

Authors
  1. Professor Dr. Hans Mohr
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  2. Professor Dr. Peter Schopfer
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© 1992 Springer-Verlag Berlin Heidelberg

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Mohr, H., Schopfer, P. (1992). Photosynthese als Funktion des Chloroplasten. In: Pflanzenphysiologie. Springer-Lehrbuch. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-97370-3_12

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  • DOI: https://doi.org/10.1007/978-3-642-97370-3_12

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-97371-0

  • Online ISBN: 978-3-642-97370-3

  • eBook Packages: Springer Book Archive

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