where a, b, c, d and f are model parameters that were estimated from the data (Table 2), L is a local parameter that can be derived either from a national wood density surface (Palmer et al. 2013) or from density measurements made on a sample of trees, and Ring is the ring number from the pith.
where D BH is the basic density of a five-ring group at breast-height, Ring is the midpoint ring number from the pith for this five-ring group, and a, b, c, d, and f are model parameters estimated from the data.
When Ring = 16 (the mean ring number of a 5-ring outerwood core collected from a 20-year-old tree after allowing 1.5 years for the stem to attain breast height), the model estimates the Wood Density Index.
Fortified sediments gave an average recovery between 86.7 and 106.6%, with relative standard deviation of 2.02 6.83% for PAHs with a ring number higher than three.
Under the electrokinetic and bacteria conditions, the relative enhancement in the degradation of four- to six-ring PAHs compared to the control experiment was much stronger and increased with increasing ring number.
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However, the effects of biochars on the biodegradation rates of major individual PAH (e.g., Nap, Phe, Pyr, and Chr) depended on both the types of biochars and the PAH properties such as benzene ring number and angular pattern of the ring linkage.
The average growth ring number from the pith was measured for each heartwood block.
M. Morelet (DTR) and heartwood ring number (HWRN), are examined in this paper.
The radial variation in breast-height wood density was predicted as a function of either ring number or both ring number and ring width, with the latter model better accounting for the effects of stand spacing.
The first was a modified logistic function, which predicts MFA as a function of ring number from the pith.
