Development and evaluation of robust tree biomass equations for rubber tree (Hevea brasiliensis) plantations in India

Forest Ecosystems

Table 4 Parameters and goodness of fit statistics for the various models used in estimating biomass components combining all stand ages

Components	Model	Intercept	Slope	R ²	AICc	RMSE
AGB	1	−2.82 (0.21)^a	2.60 (0.07)	0.954	−170.6	0.270
	2	−3.31 (0.15)	0.95 (0.02)	0.977	−217.1	0.192
	3	−3.49 (0.32)	3.03 (0.12)	0.911	−126.6	0.377
	4	−14.47 (0.46)	1.58 (0.04)	0.963	−186.2	0.241
Foliage	1	−4.41 (0.51)	1.87 (0.18)	0.635	−49.0	0.672
	2	−4.48 (0.57)	0.65 (0.07)	0.588	−40.9	0.713
	3	−3.91 (0.71)	1.82 (0.27)	0.418	−17.8	0.847
	4	−11.89 (1.41)	1.07 (0.12)	0.559	−36.4	0.738
Branches	1	−2.76 (0.46)	2.03 (0.16)	0.714	−62.5	0.607
	2	−2.95 (0.51)	0.71 (0.06)	0.687	−56.4	0.636
	3	−2.60 (0.65)	2.11 (0.24)	0.543	−31.1	0.767
	4	−11.32 (1.25)	1.19 (0.10)	0.672	−53.4	0.650
Stem	1	−3.97 (0.27)	2.88 (0.09)	0.934	−131.8	0.362
	2	−4.57 (0.19)	1.05 (0.02)	0.972	−188.4	0.237
	3	−4.95 (0.29)	3.45 (0.11)	0.941	−139.4	0.342
	4	−17.09 (0.50)	1.77 (0.04)	0.967	−176.5	0.259
Coarse roots	1	−2.4 (0.23)	1.7 (0.08)	0.871	−155.1	0.305
	2	−2.64 (0.23)	0.60 (0.03)	0.883	−161.9	0.290
	3	−2.69 (0.32)	1.91 (0.12)	0.802	−126.7	0.375
	4	−9.84 (0.56)	1.02 (0.05)	0.881	−160.9	0.292
	5	−0.53 (0.12)	0.64 (0.03)	0.905	−175.4	0.261
Total biomass	1	−2.38 (0.20)	2.49 (0.07)	0.954	−176.7	0.259
	2	−2.84 (0.15)	0.90 (0.02)	0.976	−221.2	0.184
	3	−3.00 (0.31)	2.89 (0.11)	0.908	−130.9	0.365
	4	−13.50 (0.45)	1.51 (0.04)	0.963	−191.1	0.232