Aboveground biomass of secondary Quercus fabri forest in Dahe Township of Duyun City in Guizhou Province was investigated. The results showed that the biomass of individual tree and its components were increased with the elevation of diameter grade and height of trees. The individual biomass varied depending on its diameter or components of trees. The distribution rule of biomass was stem ＞ living branch ＞ dried branch. Proportion of stem biomass was the highest, and more than 72% . Relationship between the biomass of individuals or different components of the secondary forest ( W) and the breast-height diameter square or height ( D2 H ) could be well fitted using the power function model W = bO ( D2 H )bl. Additionally, the accuracies of three regression models fitted were all high, and could be preliminarily used to predict aboveground biomasses of secondary Quercus fabri forest in surveyed area.%对分布于贵州省都匀市大河乡的白栎次生林进行了地上部分生物量测定.结果表明,白栎次生林单株及各构件生物量随林木胸径、树高的增大而增加,不同径阶林本单株及各构件生物量之间的差异较大.各构件生物量的分配规律为:树干＞活枝＞枯枝,其中树干生物量所占比例最大,平均达72％以上.白栎次生林单株及各构件生物量(W)与胸径平方与树高乘积(D2H)之间的关系,可采用幂函数模型W=b0(D2H)b1进行模拟.本文所拟合的3个回归模型精度均较高,可初步用于调查区白栎次生林地上部分生物量的预测.
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