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WOLFRAM|DEMONSTRATIONS PROJECT

A Forest Growth Curve

​
rejuvenation bias u =
22.7319
site productivity p =
58.2729
age
volume
30
289
35
445
40
565
45
704
50
833
55
924
The age-dependence of forest biomass (
b
) is shown to be a power-law monomial where the power of the age (
a
) is theoretically estimated to be 4/5. However, in testing the 4/5 law against observations, a "rejuvenation bias" (
u
) should be introduced to explain the variations in growth pattern induced by delayed development or intensive thinning of the forest stand at the early stage. In other words,
b(a)=
4/5
p(a-u)
,
where
p
is characterizing site productivity. This graph shows model fits superimposed on the data from a permanent monitoring plot. It allows model testing against independent data.
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