Table 2 The parameter estimates and evaluation indices of biomass and carbon models for 20 forest types.

From: Estimating changes of forest carbon storage in China for 70 years (1949–2018)

Forest types	Parameter estimates					Evaluation indices of model (1)
Forest types	a₀	b₀	c₀	d₀(CF)	RSR	R²	SEE/m³	TRE/%	ASE/%	MPE/%	MPSE/%
Coniferous
Fir	4.1095	0.5976	0.8181	0.4951	0.2223	0.871	47.62	− 0.04	2.82	2.22	17.37
Spruce	1.3879	0.7168	0.7991	0.4901	0.2514	0.913	29.97	− 0.02	5.79	1.24	15.77
Larch	0.6986	0.8262	0.7794	0.4888	0.2830	0.936	15.10	− 0.02	3.41	0.83	13.36
Chinese fir	0.5743	0.7120	0.8109	0.4969	0.2332	0.936	12.07	− 0.01	4.43	0.87	14.06
Cypress	0.4545	1.5341	0.8007	0.5013	0.2489	0.947	22.57	0.00	3.02	1.65	16.48
Masson pine	1.4282	0.9768	0.8297	0.5162	0.2053	0.953	11.28	0.00	1.31	0.67	9.95
Chinese pine	0.2112	1.1235	0.8098	0.5130	0.2349	0.966	16.17	0.00	− 0.63	1.66	15.72
Yunnan pine	0.9158	0.6501	0.8453	0.5047	0.1830	0.973	11.89	0.00	3.98	1.71	13.81
Other coniferous	1.0721	0.8303	0.8041	0.5009	0.2436	0.946	20.86	− 0.01	6.35	1.64	20.35
Broadleaved
Oak	0.7196	1.2948	0.7930	0.4810	0.2610	0.917	26.74	− 0.01	2.95	0.85	17.44
Birch	0.7507	1.0118	0.7821	0.4867	0.2786	0.898	17.34	0.01	1.28	1.02	14.48
Poplar	0.2945	0.8978	0.8246	0.4725	0.2127	0.934	12.18	0.00	0.23	0.78	13.19
Robinia	0.3864	1.5499	0.7833	0.4838	0.2767	0.933	10.83	− 0.02	3.33	2.02	14.83
Eucalypt	0.3330	1.1740	0.7793	0.5238	0.2832	0.962	8.98	0.00	1.32	1.18	8.88
Rubber-woods	0.2401	0.8679	0.7981	0.4956	0.2530	0.989	4.36	− 0.01	3.74	0.57	6.83
Other hard-broad	0.3454	1.2130	0.7880	0.4856	0.2690	0.933	14.37	− 0.01	2.94	1.17	17.67
Other soft-broad	0.6534	0.9920	0.7954	0.4873	0.2572	0.897	18.63	− 0.02	4.83	1.79	19.65
Mixed
Coniferous	3.3612	0.8348	0.8088	0.5014	0.2364	0.919	19.98	− 0.01	2.41	1.25	14.16
Conifer-broadleaved	2.2575	0.9560	0.7961	0.4920	0.2561	0.892	20.73	− 0.04	3.84	0.90	15.85
Broadleaved	1.3944	1.1086	0.7938	0.4835	0.2598	0.916	22.69	− 0.03	3.36	0.47	15.48

All parameter estimates are significant at the level a = 0.01. Parameter d₀ is equivalent to the average carbon factor (CF) of each forest type, and RSR is the average root-to-shoot ratio resulting from Eq. (5).

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Table 2 The parameter estimates and evaluation indices of biomass and carbon models for 20 forest types.

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