Study on Photosynthesis andFluorescence Characteristics of Stewartiasinensis with Different Diameter Classes
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Abstract
Determinations were implemented in July 2018 on photosynthetic characteristics, fast chlorophyll fluorescence induction dynamic and relative chlorophyll contentof Stewartiasinensiswithdifferent diameter classes (small: DBH≤2cm, medium: 2
8cm), as well as on microclimate of determined plant in QingliangfengNational Nature Reserve, Zhejiang province.The results showed thatnet photosynthetic rateof S.sinensiswas large>small > medium.The light compensation pointofS.sinensiswith different diameter classes ranged from 6.67 to 18.67μmol?m-2?s-1,and light saturation point from 241.33 to 504.00μmol?m-2?s-1, indicatingthat S.sinensis had a low level of light adaptation.Relative chlorophyll contentin leaves ofS.sinensiswas ordered by large> medium>small, suggestingthat shading was in favourof photosyntheticpigment for better photosynthesis under weak light.It had significant difference of fast chlorophyll fluorescence induction dynamic between mediumand large, small(P<0.05), revealing that medium suffered weak light suppression.
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