Carbohydrate dynamics in roots, stems, and branches after maintenance pruning in two common urban tree species of North America

《Carbohydrate dynamics in roots, stems, and branches after maintenance pruning in two common urban tree species of North America》

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关键字: Acer platanoides; Acer saccharinum; Compensatory mechanisms; Native/exotic urban trees; Non-structural carbohydrates; Urban stresses; MAPLE ACER-PLATANOIDES; TEMPERATE FOREST TREES; NONSTRUCTURAL CARBOHYDRATE; NORWAY MAPLE; SUGAR MAPLE; CARBON; ALLOCATION

作者单位: [Ramirez, J. A.; Handa, I. T.; Messier, C.] Univ Quebec Montreal, Ctr Forest Res, POB 8888,Succursale Ctr ville, Montreal, PQ H3C 3P8, Canada. [Ramirez, J. A.] Univ Cauca, Fac Ciencias Agr, Calle 5 N 4-70, Popayan, Colombia. [Posada, J. M.] Univ Rosario, Fac Ciencias Nat & Matemat, Programa Biol, Carrera 24 63C-69, Bogota, Colombia. [Delagrange, S.; Messier, C.] Univ Quebec Outaouais UQO, Inst Temp Forest Sci ISFORT, 58 Rue Principale, Ripon, PQ J0V 1V0, Canada. Ramirez, JA (reprint author), Univ Quebec Montreal, Ctr Forest Res, POB 8888,Succursale Ctr ville, Montreal, PQ H3C 3P8, Canada. E-Mail: ramirerz_jorge_andres@courrier.uqam.ca

摘要: The ability of plants to tolerate stress is determined in part by the carbon allocated to their reserves. We studied two common urban tree species in northeastern North America, Acer saccharinum (Silver maple, native) and Acer platanoides (Norway maple, exotic), to assess the dynamics of non-structural carbohydrate (NSC) concentrations immediately following a maintenance pruning of 30% of the tree crown. NSC concentrations were measured by high-performance liquid chromatography in branches, main stems, and root tissues for both pruned and un-pruned trees at three intervals during the growing season. NSC concentrations in tree organs of A. platanoides were 75% higher than in A. saccharinum. Maintenance pruning did not have any significant depletion effect on carbohydrate concentrations in the tissues of either species. Yet, there was a significant increase in the NSC concentrations in un-pruned branches of pruned trees of A. platanoides at the end of the growing season, but no effect was observed in A. saccharinum. Higher levels of carbohydrates after pruning in woody plant tissues suggested that A. platanoides may have compensatory mechanisms that allow this species to respond better to maintenance pruning than A. saccharinum.