The absolute dry density of bamboo is about 0.819g/cm~3 for average, which increases from the base to the tip, but on the contrary, for the porosity. They both are related by the regression equation: Y = 99.95-66.726X.

• 竹材的绝干密度约为0.；819g/cm~3；表现为从基部到梢部递增；孔隙度变化正相反；从基部到梢部递减；二者服从一元线性回归Y=99