Study on Effects of Pruning to Promote Trunk Extension onPhotosynthetic Characteristics of Paulownia
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1.
Research and Developmen t Cen ter ofPau lown ia, State Forestry Adm in istrat ion, Zh engzhou- 450003, He# nan, China
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2.
College of Forestry Resource and Environmen, t Beijing Forestry Un ivers ity, Beijing- 100083, China
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3.
College of Forestry Resource and Environmen, t Beijing Forestry Un ivers ity, Beijing?? 100083, China
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4.
Research and Developmen t Cen ter ofPau lown ia, State Forestry Adm in istrat ion, Zh engzhou?? 450003, He# nan, China
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Received Date:
2006-03-03
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Abstract
Using L i-6400 portable photosynthesis system, the photosynthetic rate o f various crowns and direct ions ofpau lown ia o f tw o treatm ents, responding to d ifferent photosynthetic photon flux density, w eremeasured. Fitting andregression ana lysis w ith the equation Pn = Pmax ( 1- C 0 e- aPPFD / Pmax ) , the parameters w ere calcu lated and stud ied.The result show ed: ( 1) Techn ique o f pruning to promo te trunk extension could improve photosynthe tic capacity andadaptive ab ilities of paulow nia to dealw ith light surround ings. Themax photosynthe tic rate ( Pmax ) , light saturationpo int ( LSP) , light compensate po in t ( LCP) and photosynthet ic range ( PR ) of pruned paulow niaw ere 23. 93 μmol·m-2·s-1, 1 966. 58 μmol·m-2·s-1, 53. 88 μmol·m-2·s-1, 1 911. 71μmol·m-2·s-1. Comparisonsw ith the contro,l the value o f the above parame ters w as 11. 85% , 15. 61% , 29. 06%, 15. 21% higher. ( 2)Techn ique o f pruning to promote trunk extension had greater effect on low er crow n than upper and made the difference betw een the tw o crowns shortened. Pmax, LSP, LCP and PR of low er crow n o f pruned pau lown ia w ere27. 70% , 36. 74% , 34. 22% and 36. 80% higher than that of the contro.l But there w as no sign ificant differencebetw een tw o treatments in the upper crow n. ( 3) E ffects o f pruning to promo te trunk ex tension on photosyntheticcharacter istics of various d irections among the crow ns w ere differen.t The parameters of Pmax, LSP, LCP and PR ofpruned shade leaves and sun leaves of upper crow n w ere h igher than that o f the contro.l But all of them w ere not sig-n if icant differen.t In the low er crow n o f paulown ia, Pmax , LSP, LCP and PR o f the treated sun leaves w ere21. 80% , 39. 02% , 28. 72% and 39. 26% h igher than that of the contro,l and tha t of the treated shade leavesw ere 42. 18%, 39. 35% , 48. 70% and 39. 13% h igher than that of the contro.l Except LCP, the differences o f a llthe parameters be tw een the two treatm ents w ere significan.t
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