Based on chemical component analysis and morphological observation,the silicon content and phytolith morphology were investigated in different parts of culms in Dendrocalamus giganteus at various age.The results showed that the silicon content increased with increasing culm age,and was higher in the outer zone than in the inner zone.In addition,the silicon content was higher in the top than in the bottom.There identified 10 types of phytolith in D.giganteus culms,and irregular silicon deposition was also observed.The number of phytoliths increased with increasing age.Round and dumb-bell shaped phytoliths occurred in young culms,while elongate and rectangular ones were found in old culms.Higher percentage of round phytoliths were found in inner zone,while that of rectangular and elongate phytoliths occurred in outer zone.The irregular silicon deposition was mainly seen in young bamboo culms.%采用化学成分分析和形态解剖观测的方法测定不同年龄及不同部位龙竹(Dendrocalamus giganteus)竹秆硅和植硅体含量.结果表明:龙竹竹秆硅含量随年龄增加而增加.竹青硅含量大于竹黄.竹秆上部硅含量大于底端.龙竹竹秆中主要存在10种类型植硅体.同时,还存在不规则的硅沉积.龙竹竹秆植硅体随年龄增长而增多.圆型、哑铃型发生较早,杆型、长方型发生较晚.竹黄圆型植硅体所占比例居多,而竹青长方型、杆型植硅体所占比例居多.无定型硅沉积主要存在于低年龄竹秆中.
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