Table 6. Below to aboveground ratio(Root/shoot ratio; R) one sample t-test results.

Species	Root/shoot ratio	μ	P-value
M. glyptostroboides	0.446(0.009)	0.28(Fixed coefficient by forest type)	<0.001
P. occidentalis	0.402(0.012)	0.41(Fixed coefficient by forest type)	>0.05

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