Effects of shading on photosynthetic parameters of two kinds of garden plant
CHANG Hongjuan
Abstract：In order to obtain the photosynthetic physiological parameters on dynamic characteristics such as leaf net photoG synthetic rate (P n ),transpiration rate,water use efficiency of two kinds of garden plant to different light conditions,the physG iological parameters on dynamic characteristics of three– year-old Euonymus fortune var.minimus Rhed and Parthencissus semicordata were measured by LI-6400 portable photosynthesis system.We analyzed the effects of shading on photosynthesis between E.fortune var.minimus Rhed and P.semicordata.The results showed that:in different shading treatment,the diurG nal variation of Pn of the P.semicordata presented a single-peaked curve.Under full illumination of shading,40% of shading treatment,the diurnal variation of Pn of E.fortune var.minimus Rhed presented a single-peaked curve.Under 70% of shadG ing treatment,the diurnal variation of P n of P .semicordata presented a double-peak curve.Under full illumination of shadG ing,the mean Pn of diurnal variation and daily maximum of the two plants reached the maximum.Under 70% of shading, 40% of shading treatment,the peak of Pn of E.fortune var.minimus Rhed decreased by 57.80%、80.24%,the peak of Pn of P.semicordata decreased by 55.1%、76.86%.The transpiration rate decreased as the shading treatment is aggravating.Under 70% of shading,40% of shading treatment,the peak of transpiration rate of E.fortune var.minimus Rhed decreased by 46. 68%、55.60%,the peak of transpiration rate of P.semicordata decreased by 41.48%、74.00%.In different shading treatment, the mean water use efficiency of E.fortune var.minimus Rhed and P.semicordata were in order of full day light intensity >70% of shading > 40% of shading.This study suggested that E.fortune var.minimus Rhed and P.semicordata had the property of light demander,while it had the ability of shade tolerance in a certain degree and it is feasible for urban landscaping.
Keywords：Euonymus fortune var.minimus RhedParthencissus semicordatashadenet photosynthetic ratewater use efficiency
Publication Date：2016-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 26-31,7 )