Estimation of carbon stocks in harvested wood products of buildings in Japan: flux-data method and direct inventory method

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 3 Optimal parameters to minimize the sum of squares of the difference according to decay function

	FOD	Logistic distribution	Log-normal distribution	Normal distribution
Half-lives of log and sawnwood (y)	65	54	64	70
Half-lives of plywood and particle and fiber board (y)	65	53	64	66
Decay coefficient	–	0.30	2.00	1.00
EI	0.0017	0.0015	− 0.0041	− 0.0027
Sum of squares of differences	122.913	138.328	70.895	81.573

Sum of squares of differences refers to the values estimated by the flux-data and direct inventory methods
FOD, first-order decay; EI, estimated continuous rate of change in industrial roundwood consumption between 1900 and 1961