As the short rotation coppices(SRC), Salix spp., poplar and yellow poplar, they demonstratefast growth and asexual propagation ability. Despite the rapid growth characteristics, for use astree biomass materials, calorific value has not been extensively studied. In this study, itinvestigated the calorific values belonging to Salix spp., poplar and yellow poplar with particularemphasis on S. gracilistyla., S. gracilistyla and S. caprea showed greater calorific values thanthose measured with other species(4,546.6 cal g-1 and 4,539.6 cal g-1 respectively). Calorificvalues were demonstrated to the higher content of xylem tissue. S. gracilistyla from Wonju,YW1-1 and WJ2-9 showed the higher calorific values than other groups and clones. The presentresults demonstrate higher calorific value and low ash content, and these will be selectedasappropriate species and clones for biomass production purpose.

ABSTRACT
 Introduction
 Materials and metho
  1 Calorific value measurement
  2 Ash content measurement
  3 Statistical Analyses
 Results
  1 Inter- and intra-specific patterns in calorific content
  2 Spatial patterns in S. gracilistyla calorific content
  3 Inter-clone patterns in S. gracilistyla calorific content
 Discussion
 References

• Hyunseok Lee(Department of Forest Genetic Resources, National Institute of Forest Science)
• Jaeseon Yi(College of Forest and Environmental Sciences, Kangwon National University)
• Chanhoon An(Forest Medicinal Resources Research Center, National Institute of Forest Science) Corresponding author