北京西山人工洋槐林的生物量研究

STUDIES ON THE BIOMASS OF ROBINIA PSEUDOACACIA PLANTATION

北京西山31年生人工洋槐林,高度平均为7m,胸径平均8.3cm,每公顷为1750株,郁闭度0.5。应用胸径平方×树高（D2H）为自变量来预测树木各部分干重（W）,具有极显著相关。根据茎重（W5）=58.88（D2H）0.88,枝重(WBr)=e7.77+0.001（D2H）,叶重（WL）=e3.71+0.0008（D2H）和根重（WR）=e(7.67+0.0009（D2H）的方程,估算出乔木层茎的生物量为28.45吨/公顷,枝的生物量11.6吨/公顷,叶的生物量0.97吨/公顷,根的生物量7.6吨/公顷,乔木层生物量为48.62吨/公顷。灌木和草本层在9月份地上部分生物量为13.71吨/公顷,地下部分生物量为10.72吨/公顷,灌木和草本层的生物量为24.43吨/公顷。人工洋槐林的总生物量合计为73.05吨/公顷。

The average height of 31-aged Bobinia pseudoacacia plantation in west mountain of Beijing is 7 m and the mean breastheight diameter of tree is 8.3 cm. The number of tree per hectare appears 1750. The canopy coverage of plantation shows 0.5. Using the diameter square at tree breast height times tree height （D2H）, as an independing variable, to estimate the dry weight of various parts of trees, between them the significient correlations occur. According to the modle of Wstem=58.88（D2H）0.88, Wbranch= e7.77+0.001（D2H）, Wleaf=e5.71+0.0008（D2H）,Wroot=e7.67+0.0009（D2H）, 28.45 t/ha of the stem biomass, 11.6 t/ha of the branch biomass. 0.97 t/ha of the leaf biomass, 7.6 t/ha of the root biomass are estimated in arbor layer. The aboveground and belowground biomass of shrub and herb layers are 13.71 t/ha and 10.72 t/ha respectively in September, the biomass of shrub and herb layer is 24.43 t/ha. 73.05 t/ha of the total biomass in Robinia pseudoacacia plantation is obtained.