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Table 2 Regression model of each biomass compartment. The regression models were based on the Gompertz function. Biomass carbon (C) stock (Mg C ha−1) for each compartment (age) = a × exp [b × exp (c × age)]. The annual increase of C stock was calculated by the first-order derivative of each function

From: Estimating the age-dependent changes in carbon stocks of Scots pine (Pinus sylvestris L.) stands in Turkey

Compartment

Parameter

a

b

c

Stem

163.0

−3.13

−0.016

Branch

50.0

−3.38

−0.010

Foliage

4.5

−2.47

−0.100

Coarse root

49.2

−2.83

−0.012