The seasonal photosynthetic response of Phyllostachys edulis ’Pachyloen’ to light intensity,CO2 concentration,temperature and humidity were measured with Li-6400P.The main study results were as follows:The seasonal photosynthetic variation tendency of Ph.edulis ’Pachyloen’ to light intensity was summer>autumn>winter>spring for Pmax,spring>autumn>winter>summer for LCP,autumn>summer>winter>spring for LSP,and summer> autumn>winter>spring for AQY.The seasonal photosynthetic variation tendency of Ph.edulis ’Pachyloen’ to CO2 concentration was spring>autumn>summer> winter for LCP and CCP,and summer>autumn> winter>spring for CE.The optimal temperature for photosynthesis of Ph.edulis ’Pachyloen’ ranged from 20 to 30 ℃,equivalent in spring and autumn,higher in summer and lowest in winter.The optimal humidity for photosynthesis of Ph.edulis ’Pachyloen’ ranged from 40% to 65%,its seasonal variation tendency was autumn>summer>winter>spring.As a cultivar of Ph.edulis,the characteristics of photosynthetic responses of Ph.edulis ’Pachyloen’ to environmental factors were similar with Ph.edulis.It indicated their close phylogenetic relationships.
