窄冠福建柏单木生物量垂直分布格局研究

    Studying on vertical distribution of individual tree biomass of Fokienia hodginsii(Dunn)

    • 摘要: 通过对窄冠福建柏与福建柏原种单木生物量垂直分布格局进行研究,结果表明:窄冠福建柏树干生物量分配比例较高,符合用材林培育目标。窄冠福建柏树干生物量的分配比例比福建柏原种增加4.70个百分点。窄冠福建柏与福建柏原种单木生物量垂直分布存在差异。窄冠福建柏标准木各层树干材积呈平缓递减,冠层较长,冠层第2~4层叶量占总叶量的76.3%,第1层和第5层分别占14.9%和8.8%,各层次均有叶分布,林冠层浓密、紧凑,总叶量较均匀地分布在树冠中上、中部、中下层,冠顶、冠下层叶量偏少,总趋势是叶量分布下偏。福建柏原种标准木各层树干材积呈梯度急剧锐减,冠层主要分布在第2层和第3层,叶量占总叶量的81.7%,冠层明显上移,林冠下部(约占1/3)枝多叶少。

       

      Abstract: Vertical distribution of individual tree biomass of Fokienia hodginsii(Dunn) and Fujian Cypress stock were comparatively studied in this study. The results showed that the distribution ratio for Fokienia hodginsii(Dunn) was higher than that of Fujian Cypress stock, which was suitable for timber forest cultivation. Distribution ratio of trunk in Fokienia hodginsii(Dunn) was 4.7 percent points higher than that in Fujian Cypress stock. Significant differences were observed between single tree biomass vertical distributions of Fokienia hodginsii(Dunn) and Fujian Cypress. The trunk volume of different layers of Fokienia hodginsii(Dunn) decreased gently. The canopies of Fokienia hodginsii(Dunn) were longer , the leaf biomass of the 2-4 layer canopies accounted for 76.3% of the total leaf biomass, and that of the first and fifth layer accounted for14.9% and 8.8%, respectively. The leaves distributed in every section of the canopy, forming dense and compact one in which the leaves uniformly distributing in middle-top, middle and middle-low parts of the canopy, and few leaves distributing in low and top parts of the canopy. The leaf biomass-distributing trend was located in the lower side of the canopy. In Fujian Cypress stock, the trunk volume of different layers decreased sharply, and the canopies were mainly located in the second and third layer, the leaves biomass of which accounted for 81.7% of the total leaves. The canopies located obviously in higher position, and the fewer leaves were observed in the low part of the canopy (about one third).

       

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