Effects of Shading on the Photosynthetic Characteristics and Growth of Magnolia sieboldii

Abstract

Abstract: The effects of different shading treatments(A:0, B:25.8%, C:61.3%, D:90.3%)on the photosynthetic characteristics and growth ofMagnolia sieboldii were examined.The results showed that the basal diameter, height and biomass at B treatment were higher than those at other shading treatments.The light compensation point(LCP), light saturation point(LSP) and dark respiration rate(DP)of the Magnolia sieboldii were at a low level, the value of which decreased with the increasing of shading degree.The daily variation of netphotosynthetic presented a bimodal curve under four shading treatments.The netphotosynthetic rate was B>A>C>D.It is obvious that B treatment can provide the most suitable condition for Magnolia sieboldii among four shading treatments.So we can conclude that moderate shading could increase the leaf photosynthesis and plant growth of Magnolia sieboldii.

Key words: Magnolia sieboldii, shading, photosynthetic characteristics

CLC Number:

Q945

DING Lei, HU Wanliang, WANG Wei, LIU Zhengde, LI Guosheng, YAO Rongsheng, ZHANG Yupeng, WANG Gang. Effects of Shading on the Photosynthetic Characteristics and Growth of Magnolia sieboldii[J]. FOREST RESOURCES WANAGEMENT, 2009, (3): 61-65.

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