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The dependence of CO2 exchange on density of irradiation, temperature and water saturation deficit in Stipa and Bromus



The dependence of CO2 exchange on density of irradiation, temperature and water saturation deficit in Stipa and Bromus



Photosynthetica 1(3/4): 171-178



The dependence of photosyn-thetic rate on density of photosynthetically active radiation, temperature and water saturation deficit and the dependence of respiration rate on temperature were studied in 5 species of Stipa, native to Czechoslovakia, and in Bromus erectus. In comparison with S. pulcherrima, S. dasyphylla and S. stenophylla, S. joannis showed higher photosyn-thetic and lower respiration rate; in this respect, its performance was nearest to that of B. erectus. In S. capillata, the rate of CO2 uptake was approximately 50% lower than in the other species investigated in the same conditions.

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