JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2018, Vol. 42 ›› Issue (03): 105-110.doi: 10.3969/j.issn.1000-2006.201709036

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Photosynthetic characters of seedlings of plant species for afforestation in Zhoushan Island

YE Bo,ZHANG Ling,WANG Guoming   

  1. 1.Zhoushan Academic of Agriculture and Forestry,Zhoushan 316000, China
  • Online:2018-06-06 Published:2018-06-06

Abstract: Abstract: 【Objective】Compare the light adaptation and shade tolerance of plant species for afforestation on Zhoushan Island, Zhejiang Province, to provide development bases for plant species in the island vegetative recovery process. 【Methods】The diurnal changes of photosynthesis and light response characteristics for Cinnamomum japonicum var. chenii, Neolitsea sericea, Machilus thunbergii, Ilex integra, Eurya emarginata, Eurya japonica, and Rhaphiolepis umbellata were measured using the Li-6400 portable photosynthesis system. Then, the photosynthetic characters and shade tolerance of seven plant species were compared. 【Results】The diurnal changes in net photosynthetic rate(Pn)of M. thunbergii presented a double-peak curve pattern, others presented a single-peak curve pattern. Pn of R. umbellate was significantly higher and the Pn of C. japonicum was significantly lower than that of the others. The diurnal changes in stomatal conductance(Gs)and transpiration rate(Tr)of the seven species was similar to the diurnal changes in Pn, and the diurnal changes in intercellular CO2 concentration(Ci)was opposite to that of Pn. In the light-photosynthetic response determination, Pn of the seven species increased with enhanced photosynthetically active radiation, and when it reached a certain threshold varied among the seven species. E. emarginata had the highest light saturation point(LSP), and R. umbellate had the highest light compensation point(LCP), whereas C. japonicum had the lowest LSP and LCP. The cluster analysis for LSP and LCP showed that E. emarginata belonged to the strong positive species, R. umbellate, I. integra, E. japonica and N. sericea were positive species. The remaining three species were classified as shade-tolerant tree species. 【Conclusion】Our results indicated that E. emarginata and R. umbellate should be configured in full-light environments on the island during the vegetative recovery process. I. integra and E. japonica should be placed under the open forest or in thickets, whereas the other three species should be in a weak-light environment.

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