Abstract:

This paper deals with the morphological and quantitative characters of secondary xylem of Aegiceras corniculatum and Sonneratia caseolaris. The relation between the structure of wood and the environmental influences has also been discussed.The features of small vessel diameter,many vessel numbers and high vessel frequency ensure the safety for water transportation inside plant.The ratios(2W/L), namely thickness of fiber wall(W)and width of fiber cavity(L),of both Aegiceras corniculatum(0.67)and Sonneratia caseolaris(0.45)are less than 1,demonstrating their timbers are the good raw materials for papers making.

Key words: Aegiceras corniculatum, Sonneratia caseolaris, Secondary Xylem, Ecological anatomy