Bark biomass as an energy source has a high eco-nomic value.Bark content variations and production helps recognize the potential of this bioenergy source spatially before harvesting.The percentage of fresh and dry bark in Populus deltoides grown under a monoculture system was examined in the temperate region of northern Iran.Diameter at breast height(DBH)and total height data were analyzed based on an initial inventory.Ten sample trees were felled,separated into 2 m-segments,and weighted in the field.A 5-cm-thick disc from each segment was extracted for deter-mining fresh and dry bark percentages.These were statis-tically significantly different in disc diameter classes and decreased with increasing disc diameters.Bark percentage of the disc classes ranged from 21.8 to 24.4％in small-sized diameters to 8.1-9.3％in large-sized diameters.The differ-ences between fresh and dry bark percentages depended on water content variations.Allometric power equations were fitted to data of fresh and dry bark percentages and disc diameters as well as DBH.The values of R2 ranged from 0.89 to 0.90.In addition,allometric power equations pro-vided the best fits for relationships between total stem dry biomass,dry bark biomass,and DBH,R2=0.986 and 0.979 for the total stem dry biomass and stem dry bark biomass,respectively.The allometric models can be used to esti-mate bark percentage and bark production of P.deltoides in segments and for the whole stem for a wide range of segment diameters(8-44 cm)and DBH(15-45 cm).

Jamshid Eslamdoust

Faculty of Natural Resources and Marine Science,Tarbiat Modares University,Tehran,Iran

林业研究（英文版）

[1]Jamshid Eslamdoust-.Bark content variations and the production of Populus deltoides as a source of bioenergy under temperate climate conditions)[J].林业研究（英文版）,2022(06):1807-1815

felled,Allometric

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