Regression models of biomass of different organs of Pinus massoniana were established based on the data analyses from sample tree. The study on the structure and distribution character of biomass of Pinus massoniana shows that the total biomass of Pinus massoniana was 141. 99 t/hm2. The distributing sequence of the biomass of this forest ecosystem was: free layer(98. 67 %) > litterd. 02%)>shrub layerCO. 25%)>herb layer(0. 06%). The biomass of the t ree layer was 140. 09 t/hm2 and biomass distributing sequence of different organs was: trunk (65. 31%) > root(13. 75%)> branch(12. 46%)> bark(5. 77%)>needle(2. 71%). The biomass of Pinusmasso-niana increased with the increase of their ages on the whole. The biomass of tree layer increased with the increase of age whereas the biomass of shrub layer and herb layer decreased with the increase of shade density. The biomass proportion of trunk increased with the increase of age, the needle biomass proportion decreased. The individual number of the community with DBH within the limits of 8~12 cm accounted for 27. 77% whereas the biomass of it only accounted for 8. 97%. The biomass of the community with DBH within the limits of 12~28 cm accounted for 78. 36%. The biomass of shrub layer and herb layer of this Pinus massoniana was low and its structure was irrational. The forest form should be regulated so as to improve the community comprehensive effect%在皖东地区选取样木构建了马尾松各器官的生物量回归模型,分析了马尾松林的生物量结构及其分布特征.结果表明:马尾松林分的总生物量为141.99 t/hm2,各层次的生物量大小顺序为乔木层(98.67％)＞枯枝落叶层(1.02％)＞灌木层(0.25％)＞草本层(0.06％).马尾松林乔木层平均生物量为140.09 t/hm2,林分各器官生物量顺序为树干(65.31％)＞树根(13.75％)＞树枝(12.46％)＞树皮(5.77％)＞树叶(2.71％).马尾松林分生物量随着年龄的增长呈增大趋势,其中乔木层生物量随着林龄的增加而增长,灌草层生物量因乔木层郁闭度的增加而减少.随着林龄的增加,树干生物量比例呈增大趋势,树叶生物量比例则呈下降趋势.马尾松林径级为8～12cm的马尾松株数最多,占林分的27.77％,但其生物量只占林分的8.97％,78.36％的生物量由径级12～28 cm的马尾松构成.该马尾松林分郁闭度较高,林分结构不太合理,需通过调整乔木层进行林相改造,提高群落的综合效应.
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