WOLFRAM|DEMONSTRATIONS PROJECT

Richards Growth Curve

​
maximum biomass
b
max
1566
initial biomass
b
0
30
intrinsic growth rate r
0.113
shape exponent β
0.477
rejuvenation bias u =
23.7625
site productivity p =
58.4787
age
volume
30
289
35
445
40
565
45
704
50
833
55
924
The Richards growth curve is often applied to fit empirical data on forest growth. However, the parameters of the Richards growth function are not easy to interpret in forest management terms. This graph allows interpretation of a Richards curve (red) in terms of site productivity and "rejuvenation bias"—a parameter of a 4/5 law model characterizing the effects of intensive thinning or delayed development at a early stage of growth.