Biomass Modelling of Androstachys johnsonii Prain: A Comparison of Three Methods to Enforce Additivity

Table 7

Fit statistics for CON, SUR, and NSUR methods.

Tree component	Weight function	Adj. (%)	(kg)	CV (%)	MRSE (kg)	MR (kg)
CON method
Roots		94.94	9.59	20.10	0.1520		—
Stem wood		97.49	19.66	15.84	0.0255		—
Stem bark		84.24	4.97	34.97	0.3397		—	—	—
Crown		82.16	25.11	43.01	1.5596		—
Total tree		97.61	34.92	14.29	0.0247		—
SUR method
Roots		82.44	22.06	46.24	0.1378	0.1769^*	0.0581
Stem wood		72.47	60.59	48.83	0.1732	0.6599^*	0.5943
Stem bark		52.84	10.56	74.38	0.2403	0.0930^*	0.0157	0.9906	—
Crown		81.96	27.22	46.62	1.4330	−0.1188^*	0.1053
Total tree		86.88	96.67	39.56	0.0791	0.8109^*	9.1562
NSUR method
Roots		92.76	12.84	26.92	0.1168	0.0805^*	0.0244
Stem wood		92.27	35.66	28.74	0.0440	0.3116^*	0.1718
Stem bark		78.12	6.85	48.25	0.2084	0.0423^*	0.0072	—	4.7801
Crown		85.27	26.41	45.23	0.8348	−0.0049	0.0859
Total tree		67.76	53.32	21.82	0.0321	0.4296^*	6.7590

“*” = significant at α ≥ 5%; “ ” = not significant at any probability level.