Seasonal changes in photosynthetic activity of snow tussocks (Chionochloaspp.) along an altitudinal gradient in Otago, New Zealand

DennisH.Greer

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Seasonal changes in photosynthetic activity of snow tussocks (Chionochloaspp.) along an altitudinal gradient in Otago, New Zealand

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Photosynthetic characteristics were studied inChionochloa rigida, an altitudinally widespread snow tussock and a closely related high-altitude speciesC. macra. Along a gradient from near sea level to 1600 m there were no consistent differences in maximum photosynthetic capacity which averaged 4.5 μmol CO2m-2s-1. The photosynthetic temperature optimum ranged between 15 and 18°C and there was only a limited capacity for seasonal adjustment. Net photosynthesis was light-saturated at about 500 μmol photons m-2s-1. In winter, the photosynthetic capacity decreased significantly with increasing altitude of origin of the snow tussocks. A transplant experiment indicated this was partly genetically controll

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《oecologia》 |1984年第2期|271-274|共页
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DennisH.Greer;
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University of Otago;

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Seasonal changes in photosynthetic activity of snow tussocks (Chionochloaspp.) along an altitudinal gradient in Otago, New Zealand

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