2026-09-26T13:17:28Zhttps://skemman.is/oai/request

oai:skemman.is:1946/92582025-09-03T15:36:40Zcom_1946_4482com_1946_3515col_1946_4484

Landbúnaðarháskóli Íslands Lena Mikaelsson 1984- Þorbergur Hjalti Jónsson 1959- Bjarni D. Sigurðsson 1966- The main objectives of this study were to investigate the effects of different spacing treatments on aboveground biomass production, bark, sapwood and heartwood ratios and the branching ratio in 20-year old Black cottonwood (Populus balsamifera L. ssp. trichocarpa (Torr. & A. Gray ex Hook.) Brayshaw) experimental plantation within Sandlækjarmýri research forest in southern Iceland. Data and wood samples were collected from 40 trees of 8 different spacing treatments (0.5 x 0.5 m, 0.5 x 1.0 m, 1.0 x 1.0 m, 1.0 x 1.5 m, 1.0 x 2.0, 2.0 x 1.5 m, 2.0 x 2.0 m and 3.0 x 3.0 m) repeated five times in a random manner. Main findings were that overall aboveground biomass per hectare increased with density and reached carrying capacity at approximately 5 000 trees ha-1. Density effects on survival and bark, sapwood and heartwood ratios were insignificant between spacing treatments. Initial spacing, however, did have significant effect on the ratio of branch mass to total above ground biomass that decreased with increasing density. 2011-06-20T11:07:26Z 2011-06-20T11:07:26Z 2011-06-20 2011-05 http://hdl.handle.net/1946/9258 en Productivity and biomass partitioning in 20-year Black cottonwood at variable spacing Thesis Bachelor's