Effects of shading treatment on growth and physiology of Quercus dentata Thunb.seedlings
[Objective]This studyaimed to determine the optimal light intensity for the seedling growth of Quercus dentata Thunb.and provide reference for its application in urban forest construction.[Methods]Q.dentata seedlings were used as ex-perimental materials.Four different light levels including full light exposure(CK),75％full light exposure,50％full light ex-posure,and 25％full light exposure were set up.After treatment for 60 days,the growth indexes,leaf anatomical structure,physiological indexes,and photosynthetic characteristics were measured.[Results]Under 75％full light exposure Q.dentata seedlings presented the best growth status,which promoted the growth.As the increase of shading levels of,the of thicknes-ses of leaf,palisade tissue,spongy tissue,main vein,upper epidermis,and lower epidermis of Q.dentata seedlings de-creased,as well as the palisade-spongy ratio,but the cell looseness increased.The activities of peroxidase,superoxide dis-mutase,and catalase initially decreased and then increased with increased shading levels.The contents of soluble sugars,solu-ble proteins,proline,and malondialdehyde followed a similar trend.Shading treatment eliminated the hotosynthetic lunch break phenomenon of Q.dentata seedlings,enhanced the light energy utilization efficiency,and reduced dark respiration con-sumption,which contributed to the accumulation of photosynthetic products.[Conclusion]Q.dentata seedlings exhibited a certain degree of shade tolerance,and 75％full light exposure was optimal for the seedling growth of Q.dentata.
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