Table 10. P. occidentalis’s allometric equations by tree components and the highest R²(Copmared with Model I and Model III).

Species	Tree component(Y)	Y=a(DBH)b	R2	Best equation(Compared with Model I and Model III)	R2
P. occidentalis	Volume (m3/tree)	Y=0.000634(DBH)1.904	0.914	Y=0.109885×(-0.012076)(DBH)×0.000779(DBH2)	0.971
	Stem wood (kg)	Y=0.448(DBH)1.754	0.894	Y=65.695×(--6.943)(DBH)×0.382(DBH2)	0.944
	Stem bark (kg)	Y=0.034(DBH)1.760	0.798	Y=1.712×(-0.135)(DBH)×0.019(DBH2)	0.882
	Stem (kg)	Y=0.483(DBH)1.755	0.894	Y=67.407×(-7.078)(DBH)×0.402(DBH2)	0.945
	Branches (kg)	Y=0.054(DBH)2.188	0.883	Y=26.541×(-3.923)(DBH)×0.226(DBH2)	0.911
	Foliage (kg)	Y=0.037(DBH)2.007	0.876	Y=5.517×(-0.824)(DBH)×0.066(DBH2)	0.920
	Roots (kg)	Y=0.301(DBH)1.751	0.858	Y=98.148×(-11.826)(DBH)×0.694(DBH2)	0.942
	Aboveground (kg)	Y=0.505(DBH)1.896	0.925	Y=99.465×(-11.826)(DBH)×0.694(DBH2)	0.948
	Total (kg)	Y=0.787(DBH)1.858	0.917	Y=197.613×(-23.114)(DBH)×1.134(DBH2)	0.952