Abstract
The photosynthetic characteristics of 4 species from different Calligonum sections were examined in autumn. Light response curves were measured in the field and fitted by the nonrectangular hyperbola model and modified rectangular hyperbola model. Modified rectangular hyperbola model was found greater when the fitting effects of two models were analyzed by relative errors. The comparison of the photosynthesis among four species revealed that C. pumilum had the maximum net photosynthetic rate (Pmax) with high utilization of light. The lowest light saturation point (LSP) and apparent quantum yield (AQY) were observed in C. Calliphysa which seemed to be the low utilization of light. C. densum had the highest photo inhibition coefficient and smallest photo saturation coefficient; in contrast, C. leucocladum had the smallest photo inhibition coefficient and highest photo saturation coefficient. Present study revealed that there were differences of photosynthetic characteristics between four species in the genus Calligonum. Further studies are needed to elucidate this conclusion with more species and data collected in other season.
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