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For P. radiata in New Zealand, the base age is usually set at 20 years after planting.
Site Index is defined as the height of the dominant trees in the stand at a reference base age, and is not greatly influenced by stand density.
Differences between aspects are noticeable also regarding the site index, the mean height of the dominant trees (h100) at base age 100 years being 29.2 m on the NE and 23.4 m on the SW aspect (Spiecker et al. 2001).
They developed the concept of a wood density index, which is somewhat analogous to site index in growth and yield analysis as it uses a common base age to account for the known variation in wood density with age.
For example, Germain et al. (2016) reported white pine site index (dominant/codominant height at base age 50 in m) values of 25 and 16 for HWF and PDF respectively.
The average SI and asymptote of the coastal sand forests are 24.7 m (Table 2) and 45.1 m (Table 7) respectively, implying they achieve 55% of asymptotic height by age 20 years, while as noted above, more fertile sites in these regions achieve 53% of maximum height at the same base age.
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To facilitate the analytical model, the base age-specific fertility rates were adjusted to the desired NRR by a Sykes transformation (Sykes 1973), an approach that was also employed to adjust fertility values in the Coale and Trussell (1974) model fertility schedules.
Isn't it fundamentally unfair to provide based age, not need?
"And as a brand's customer bases age, they need to take steps to make sure they are reaching younger customers all the time.
The Melbourne based Age several times a week runs articles of yet another Melbourne suburb's median home price crossing the $1,000,000 AUD levell.
These ages are also at odds with our nDNA based age estimates, which more closely match paleontological expectations within acanthomorphs.
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