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Study on Taxus chinensis var mairei Photosynthetic Physiological at Different Position of Canopy

FEI Yong-jun,MAO Qin-jia,YANG MinKE Lin,LIU Ya-li,LAN Xiu-hong College of Horticulture and Gardening,Yangtze University,Jingzhou,Hubei 434025,China  
Three female plant of Taxus chinensis var mairei in bearing age were chosen,light radiation and single branch f ruit quantities with stratification and dividing position method in the canopy were used.The light energy distribution and photosynthesis physiological of Taxus chinensis var mairei at different position of canopy were analyzed and approached.The results showed that the main photosynthesis of Taxus chinensis var mairei concentrated in upper,media external and layer external; transpiration rate in upper external,upper inner and layer inner were lower,while in other directs higher;Taxus chinensis var mairei stomatal conductance was different significantly between different places of canopy;however in the media middle,media inner and layer interior the CO2 concentration between cells were higher,responding photosynthesis less,the water ulitization efficiency in plant external was higher than internal,and in internal the transmittance was lower; Taxus chinensis var mairei transpiration rate and stomatal conductance was not relativity closely with photosynthetically active radiation;in cutting propagation,the branch in upper,media,layer external could be chosen.
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