Improvement permeability of sub-alpine fir wetwood attributed to steam-explosion treatment that made some aspirated pits un-aspirated and ruptures on pit membranes.

• 湿心材渗透性的改善，主要是由于蒸汽爆破时产生的蒸汽压力使原本闭塞的纹孔膜产生了部分复位或纹孔膜遭到了破坏。