Large-Scale Forest Modeling: Deducing Stand Density from Inventory Data

Table 4

Summary of inventory data and estimated mean closure (c) and model agreement with data for the tree species. Symbols and units in Table 1.

Species^#	number of forest units	Forest unit area* (km^2)	Age* (yrs)	Modeled closure*	Model fit to data (PRMSE)
					Model B 𝐵	Model B; 𝑑𝐵𝑔/𝑑𝑡
Abies sp.	19	235	80	0.62	15.5	20.3
Betula sp.	5	5473	54	0.76	23.6	42.2
Fagus sylvatica	33	934	86	0.63	21.4	27.6
Larix sp.	24	164	57	0.70	20.4	22.1
Picea abies	61	2465	71	0.60	18.7	24.3
Pinus pinaster	13	1416	45	0.63	27.1	29.6
Pinus sylvetris, Pinus nigra	58	3634	71	0.65	22.1	25.7
Populus sp.	9	678	45	0.52	20.2	60.2
Pseudotsuga menziesii	32	88	30	0.71	27.5	37.1
Quercus sp.	43	913	80	0.58	26.0	34.4

^#species data in Table 2. *values are means for each species.