华北落叶松人工林林木生物量的研究

Research on the tree biomass of Larix principis rupprechtii standing forest

在１４—２０年生的华北落叶松人工林中设置标准地，分别按径阶选定了３９株样木，测定其生物量，揭示了林木各器官之间的联系和林木生物量随径阶的变化规律：华北落叶松各器官生物量的分配，虽然随年龄和立地条件而异，但各部分所占比例，有一定的规律，树干占４０—５０％，树枝占２０—３０％，树叶占４—５％；根系所占比例随树龄增加而有加大的趋势，所占比例为２０—３０％。１４年、１６年、１８年和２０年的华北落叶松人工林，每公顷林木总生物量分别为５５吨、５３吨和８４吨。林木生物量与径阶有正相关关系，与（Ｄ２１．３Ｈ）有密切相关关系。随林木年龄增加，林分凋落物现存量与林木地上部分生物量的比值加大。

Sample plots have been set in 14.16.18and zo years old standing forest of Larix principis rupprechtii in Guandi Heicha and Guanqing forest regions,in Shanxi province.Sample trees biomass has been investigated according to different diameter grade.The biomass relationships among different organs were studied.The distribution of biomass among different organs was contributed mostly to the trunk,which was about 40 50%.The branch the leaf and the root was about 20 30% 4 5% and 20 30 respectively.With the age increasing,the root biomass increases progresively.Through the statistics analysis,the correlation between the tree biomass and the diameter grade was obviously.Close relationship was found between the biomass of various organs and 2 1 3 H,and the patterns of biomass change have been set.The leaf cover of standing forest also be measured.