Effects of pruning intensity on growth and photosynthetic characteristics of young plantations of Camphora officinarum
[Purpose]The response of pruning intensity to the growth and photosynthetic characteristics of young Camphora officina-rum trees was investigated to provide technical support for targeted cultivation of C.officinarum plantations.[Method]In a 5-year-old C.officinarum plantation,three pruning treatments(T1-T3)with pruning branches below 1/4,1/3,and 1/2 of tree height were applied,and the non-pruning group was used as the control(CK)to analyze the effects of pruning intensity on the growth,wound healing,and photosynthetic characteristics of C.officinarum timber trees.[Result]The results showed that the diameter at breast height(DBH)and individual volume growth of C.officinarum were inhibited in the first year after pruning,showing a trend of de-creasing with the increase of pruning intensity.In the second year after pruning,the DBH and individual volume growth of each treatment increased,and the individual volume growth of T2 treatment was significantly higher than that of CK.After two years fol-lowing pruning,the differences in DBH increment were insignificant among pruning treatments,while the total increase in tree height among the T1-T3 treatments was significantly higher than that of CK.The maximum increase in tree height and individual vol-ume was observed at T2,which was significantly higher than other treatments.The healing rate of pruned wounds of C.officinarum showed a gradually increasing trend with the increase of pruning height and wound height above ground at different times of investiga-tion,and the complete healing rate of pruned wounds showed a gradually increasing trend with the increase of wound height above ground.T,and T2 could significantly improve the net photosynthetic rate(Pn)and instantaneous carboxylation efficiency(CE)of leaves.[Conclusion]1/3 pruning height(T2)is the appropriate pruning height for young plantation of C.officinarum,which does not affect normal growth and promotes the stem form of young plantation.
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