Table 4. Multiple regression equations to estimate total organic carbon stocks (tree biomass and soil carbon stocks) of four different oak stands.

Stand	Regression coefficient	R2	P-value
Q. acutissima (n=82)	Total organic C stocks = −108.02+0.9975×(elevation, m)+1.0067 ×(stand age, yrs)+9.7136×(mean height, m)+3.4359×(basal area, m2 ha−1)	0.58	<0.0001
Q. mongolica (n=175)	Total organic C stocks = −54.80+0.1523×(elevation, m)+7.2014×(mean height, m)+3.9931×(basal area, m2 ha−1)	0.50	<0.0001
Q. serrata (n=96)	Total organic C stocks = 91.0428+0.08034×(elevation, m)+3.8991 ×(basal area, m2 ha−1)	0.40	<0.0001
Q. variabilis (n=139)	Total organic C stocks = 74.4868+4.5632×(mean height, m)+2.8800 ×(basal area, m2 ha−1)	0.13	<0.0001
Total (n=495)	Total organic C stocks = −16.2337+0.1308×(elevation, m)+6.4144 ×(mean height, m)+3.5033×(basal area, m2 ha−1)	0.45	<0.0001