We evaluated whether an experimental low-density spruce plantation (1350 stems/ha) could increase habitat suitability for moose Alces americanus compared to standard high-density plantations currently used throughout eastern Canada (∼2000 stems/ha).
With regard to genomic selection for recurrent selection at current marker densities in spruce populations, its efficiency would depend on the presence of close relatives in order to exploit the capture of relatedness and supposedly long-range LD.
The effect of different fertilisation-thinning treatments on growth and wood density of Norway spruce (Picea abies (L).
Following [2, 3] Rasmusse et al. study the model textstylebegin{cases} dot{N}(t^)=rN (1-frac{N}{kS} )-betafrac{PN^{2}}{eta ^{2}S^{2}+N^{2}}, dot{S}(t^)=rho S (1-frac{S}{S_{max}} )-delta N, end{cases} (1.1) where N and S represent the budworm population density and the spruce biomass density, respectively.
Spruce density may vary within a tree by as much at 5 8% due to its vertical location within the trunk.
White spruce stem density from natural seedfall averaged 944 stems ha−1, but was dependent on both topographic position and distance to wind-dispersed seed sources.
We found a major peak in white spruce stem density (45,000 ha−1) in units harvested in 1987 (an historically large spruce seed crop year), suggesting that where possible, foresters need to adjust management plans according to spruce mast years.
In pine stands mixed with significant density of fir and spruce, the high canopy bulk density and low canopy base height increases passive and active crown fire hazards compared to stands with few shade tolerant trees.
In a study of Picea abies (Norway spruce), wood density was unrelated to xylem cavitation (Rosner et al. 2007).
However, the marker density of the black spruce genetic map reported here is the highest for any genetic map based on a single cross in the genus Picea, as well for the maternal and paternal genetic maps (see Table 7 for comparisons).
