[Objective] Taking 5 year-old Acacia mangium as the research object,the research would provide scientific basis for the comprehensive utilization of Acacia mangium.[Method] Wood density and bark density were studied by draining method.Bark rate of Acacia mangium was determined from two aspects such as volume and dry weight.[Result] The mean of wood basic density was 407 kg/m3,bark density was 376 kg/m3.The mean of the bark volume rate was 16.5％,bark weight rate was 15.4％,and the bark volume rate was higher than the bark weight rate.[Conclusion]The basic density of Acacia mangium at a lower level,wood basic density was higher than bark basic density.%[目的]以5年生马占相思为研究材料,对马占相思基本密度和树皮率进行研究,为马占相思的综合利用提供科学依据.[方法]伐倒10株马占相思平均木,锯取圆盘,用排水法测定木材基本密度、树皮基本密度,并从体积和千重两方面测定马占相思的树皮率.[结果]马占相思的木材基本密度平均值为407 kg/m3,树皮基本密度平均值为376 kg/m3,基本密度沿树干高度增加而减小.马占相思体积树皮率平均值为16.5％,重量树皮率平均值为15.4％,体积树皮率的平均值比重量树皮率的平均值大.[结论]马占相思木材基本密度与大多数阔叶树材相比,处于中下水平;木材基本密度比树皮基本密度大.
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