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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(D~2H)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(W_5)=58.88(D~2H)~(0.88),枝重(W_(Br))=e~(7.77+0.001(D~2H)),叶重(W_L)=e~(3.71+0.0008(D~2H))和根重(W_R)=e~(7.67+0.0009(D~2H)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 31-year-old artificial acacia forest in Xishan, Beijing, with an average height of 7m, an average DBH diameter of 8.3cm, 1750 plants per hectare and a canopy confluence of 0.5. Applying the square root of breast height × height of tree (D ~ 2H) as independent variable to predict the dry weight (W) of each part of tree, it has extremely significant correlation. The leaf weight (W_L) = e ~ (3.71) was calculated from the stem weight (W_5) = 58.88 (D ~ 2H) ~ (0.88) +0.0008 (D ~ 2H)) and root weight (W_R) = e ~ (7.67 + 0.0009 (D~2H)), the biomass of arbor stem was estimated to be 28.45 t / Hectare, leaf biomass 0.97 ton / ha, root biomass 7.6 ton / hectare, arbor layer biomass 48.62 ton / ha The shrub and herb layer in September above-ground biomass was 13.71 tons / ha, underground part of the creature The biomass of shrubs and herbs was 24.43 tons / ha and the total biomass of artificial acacia forests was 73.05 tons / ha.