Abstract
Hybrid aspen ( Ã ) is one of the fastest growing tree species in Finland. During the mid-1990s, a breeding programme was started with the aim of selecting clones that were superior in producing pulpwood. Hybrid aspen can also be grown as a short-rotation crop for bioenergy. To study clonal variation in wood and bark properties, seven clones were selected from a 12-year-old field trial located in southern Finland. From each clone, five trees were harvested and samples were taken from stem wood, stem bark and branches to determine basic density, effective heating value, moisture and ash content. Vertical within-tree variation in moisture content and basic density was also studied. The differences between clones were significant for almost all studied properties. For all studied properties there was a significant difference between wood and bark. Wood had lower ash content (0.5% vs. 3.9%), basic density (378 kg m vs. 450 kg m) and effective heating value (18.26 MJ kg vs. 19.24 MJ kg), but higher moisture content (55% vs. 49%) than bark. The values for branches were intermediate. These results suggest that the properties of hybrid aspen important for energy use could be improved by clonal selection. However, selecting clones based on fast growth only may be challenging since it may lead to a decrease in hybrid aspen wood density.Populus tremulaP. tremuloidesâ3â3â1â1
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Claims 8
Claim · model-written summary
Hybrid aspen clones differed significantly for almost all studied wood and bark properties.
Verbatim
t0“in hybrid aspen”
e1“seven clones were selected from a 12-year-old field trial located in southern Finland”
e2“The differences between clones were significant for almost all studied properties”
Claim · model-written summary
Wood had lower ash content than bark (0.5% vs. 3.9%).
Verbatim
t0“in hybrid aspen”
e3“Wood had lower ash content (0.5% vs. 3.9%), basic density (378 kg m vs. 450 kg m) and effective heating value (18.26 MJ kg vs. 19.24 MJ kg), but higher moisture content (55% vs. 49%) than bark”
Claim · model-written summary
Wood had lower basic density than bark (378 vs. 450 kg m).
Verbatim
t0“in hybrid aspen”
e3“Wood had lower ash content (0.5% vs. 3.9%), basic density (378 kg m vs. 450 kg m) and effective heating value (18.26 MJ kg vs. 19.24 MJ kg), but higher moisture content (55% vs. 49%) than bark”
Claim · model-written summary
Wood had lower effective heating value than bark (18.26 vs. 19.24 MJ kg).
Verbatim
t0“in hybrid aspen”
e3“Wood had lower ash content (0.5% vs. 3.9%), basic density (378 kg m vs. 450 kg m) and effective heating value (18.26 MJ kg vs. 19.24 MJ kg), but higher moisture content (55% vs. 49%) than bark”
Claim · model-written summary
Wood had higher moisture content than bark (55% vs. 49%).
Verbatim
t0“in hybrid aspen”
e3“Wood had lower ash content (0.5% vs. 3.9%), basic density (378 kg m vs. 450 kg m) and effective heating value (18.26 MJ kg vs. 19.24 MJ kg), but higher moisture content (55% vs. 49%) than bark”
Claim · model-written summary
Values for branches were intermediate between wood and bark.
Verbatim
t0“in hybrid aspen”
e4“The values for branches were intermediate”
Claim · model-written summary
Properties of hybrid aspen important for energy use could be improved by clonal selection.
Verbatim
t0“in hybrid aspen”
e5“These results suggest that the properties of hybrid aspen important for energy use could be improved by clonal selection”
Claim · model-written summary
Selecting clones on fast growth alone may decrease hybrid aspen wood density.
Verbatim
t0“in hybrid aspen”
e6“selecting clones based on fast growth only may be challenging since it may lead to a decrease in hybrid aspen wood density”