The relationships among structure variables of larch forests in China

Forest Ecosystems

Table 2 Parameters of the standard major axis regression (SMA) and the ordinary least square regression (OLS) between tree height and DBH for larch forests in China

Forest type	No. of tree stems	SMA			OLS
Forest type	No. of tree stems	ln (a)	b	R²	ln (a)	b	R²
L. gmelinii	3009	0.74 ± 0.04	0.75 ± 0.01	0.69^***	1.03 ± 0.02	0.63 ± 0.01	0.69^***
L. gmelinii var. principis - rupprechtii	3397	0.03 ± 0.06	0.87 ± 0.02	0.44^***	0.85 ± 0.03	0.58 ± 0.01	0.44^***
L. olgensis	56	0.70 ± 0.17	0.68 ± 0.06	0.87^***	0.81 ± 0.08	0.63 ± 0.03	0.87^***
L. sibirica	1205	0.53 ± 0.07	0.81 ± 0.03	0.66^***	0.91 ± 0.04	0.66 ± 0.01	0.66^***
L. griffithii	120	−0.05 ± 0.21	0.93 ± 0.09	0.71^***	0.27 ± 0.10	0.78 ± 0.05	0.71^***
L. himalaica	210	− 0.23 ± 0.17	0.80 ± 0.07	0.49^***	0.27 ± 0.08	0.56 ± 0.04	0.49^***
L. mastersiana	101	− 0.03 ± 0.20	0.79 ± 0.07	0.76^***	0.23 ± 0.10	0.69 ± 0.04	0.76^***
L. potaninii	183	0.52 ± 0.12	0.61 ± 0.05	0.71^***	0.74 ± 0.06	0.51 ± 0.02	0.71^***
L. potaninii var. australis	491	− 0.26 ± 0.13	0.84 ± 0.05	0.58^***	0.25 ± 0.06	0.64 ± 0.02	0.58^***
L. potaninii var. chinensis	892	−0.53 ± 0.12	0.92 ± 0.04	0.53^***	0.18 ± 0.06	0.67 ± 0.02	0.53^***
L. speciosa	58	− 0.36 ± 0.29	0.83 ± 0.10	0.79^***	−0.10 ± 0.14	0.74 ± 0.05	0.79^***
Sect. Larix	7667	0.59 ± 0.03	0.74 ± 0.01	0.51^***	1.14 ± 0.02	0.53 ± 0.01	0.51^***
Sect. Multiseriales	2055	−0.22 ± 0.06	0.83 ± 0.02	0.59^***	0.28 ± 0.03	0.64 ± 0.01	0.59^***
Overall	9722	0.16 ± 0.03	0.86 ± 0.01	0.42^***	0.95 ± 0.02	0.56 ± 0.01	0.42^***

The a and b are the parameters of Eq. 3. Values represent estimate value ± standard error. ^*** indicates that the p-value was less than 0.001