Abstract:

The distribution of lignin in the cell wall of Salix gordejecii fiber and its efect on pulping and papermaking were studied.The ultrastmcture of the cell wall of lix gordejecii fiber and the distribution of lignin in the cell wall were then determined using TEM .scanning electron microscopy combined with energy dispersive X-ray analysis(SEM.EDXA)and confocal laser scanning microscopy(CLSM.The TEM images show that the cell wall of Salix gordejecii fiber is typically divided into three layers,namely the middle lamellar,the primary wall and the secondary wall that includes the outer.the middle and the inner layers,The CLSM images reveal that the distribution of lignin in the cell wall layers is not uniforill.folowing a decreasing o er of the cell comer,the middle lam ellar and the secondary wall.and that the lignin concentration in the vessel is larger than that in the fiber cell.Moreover.the SEM.EDXA results indicate that the lignin concentration in the cell comer,the middle lam elar and the middle layer ofthe secondary wall is in a ratio of 2.15:1.32:1.

Key words: Salix gordejecii, lignin, fiber, cell wall, lignin distribution