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Untersuchungen des CO 2 –Stoffwechsels submerser höherer Wasserpflanzen im Fließgewässer unter Einsatz eines fahrbaren Infrarot‐Gasanalysator‐Labors
Author(s) -
Horbach W.,
Hornig L.,
Weise G.
Publication year - 1974
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19740590104
Subject(s) - macrophyte , periphyton , photosynthesis , chemistry , environmental chemistry , botany , environmental science , hydrology (agriculture) , ecology , algae , biology , geology , geotechnical engineering
Investigations on the CO 2 Balance of Submerged Water Plants in Running Water By Means of a Motile Laboratory for Infrared Gas Analysis The CO 2 ‐balance of the submerged water mosses Hygrohypnum ochraceum f. obtusifolia, Amblystegium riparium, Amblystegium riparium f. fontinaloides and of Potamogeton trichoides (Potamogetonaceae) was investigated by means of a transportable laboratory for infrared gas analysis. The experiments were carried out in the river Zwickauer Mulde by means of glass vessels exposed to the water body. The device for continuous measuring CO 2 exchange was operated by pumping air through the vessels containing 4 l of water. The water plants exhibited a distinct day night rhythm of CO 2 turnover. In some cases river water alone, which had percolated a tampon of Perlon fibres, also showed a considerable day night rhythm of CO 2 turnover which had to be attributed to phytoplankton and suspended periphyton organisms, the activity of which is superimposed above the photosynthetic activity of the macrophytes. Measurement of the CO 2 balance of submerged plants in water containing microphytes can only be attributable to the macrophytes if the time of exposition does not exceed one day.