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Volume 40 Issue 3
Jun.  2021
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Article Contents
LI Huan, WU Yanyou, WU Yansheng. Photosynthetic characteristics of Broussonetia papyrifera and Morus alba under rock outcrop habitat in karst area[J]. CARSOLOGICA SINICA, 2021, 40(3): 487-494.
Citation: LI Huan, WU Yanyou, WU Yansheng. Photosynthetic characteristics of Broussonetia papyrifera and Morus alba under rock outcrop habitat in karst area[J]. CARSOLOGICA SINICA, 2021, 40(3): 487-494.

Photosynthetic characteristics of Broussonetia papyrifera and Morus alba under rock outcrop habitat in karst area

  • Publish Date: 2021-06-25
  • Taking the karst-adaptable plant species, Broussonetia papyrifera as the target, and the non-karst-adaptable plant (Morus alba) as the contrast, this study compared photosynthetic responses of different plant species to rock outcrop habits. Research suggests that the soil in a rock outcrop habit has higher water content and more organic matter than that in a non-rock outcrop habit. The light response curve and carbon dioxide response curve of photosynthesis, chlorophyll fluorescence parameters, water potential (LWP) and carbon stable isotope values (δ13C) of leaves were measured. Results show that there is no significant difference in LWP and δ13C between different habitats in the two plant species, while there exists a significant difference in chlorophyll fluorescence parameters of the same plant species except for the initial fluorescence parameter (F0). The respiration rate and carboxylation efficiency (CE) of Broussonetia papyrifera do not change significantly in different habitats, while that of Morus alba growing in the soil of rock outcrop habit are significantly higher than those growing in the soil of non-rock outcrop habit. Broussonetia papyrifera can maintain stable CE at the expense of carbon in the plant, thus maintaining stable photosynthetic capacity under water deficit of a non-rock outcrop habit. The karst-adaptable plant species, Broussonetia papyrifera, is more adaptable to the karst environment than Morus alba.

     

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