Table 4. Basic wood density(WD) one sample t-test results.

Species	WD	μ	P-value
M. glyptostroboides	0.293(0.008)	0.48(Fixed coefficient by forest type)	<0.001
P. occidentalis	0.509(0.018)	0.65(Fixed coefficient by forest type)	<0.001

μ is the coefficient used during the calculation of urban forest carbon stocks(Son et al., 2008; Park and Jwa, 2009).