武夷山地区马尾松天然次生林生物量结构特征

Biomass Structure Characteristics of Natural Secondary Forest of Pinus Massoniana in Wuyishan area

对武夷山国家级自然保护区的立地条件基本一致、林分经营措施基本一致但不同年龄的马尾松天然次生林生物量结构特征进行了研究,结果指出:马尾松天然次生林总平均生物量为195.25thm-2,其中乔木层占绝大部分,其生物量为164.47thm-2,占总生物量的83.39%。树干其占了大部分的马尾松生物量,所占乔木层生物量的比例随着样地林分年龄的增大而升高,最高到73.27%。马尾松单木生物量根据年龄的不同而有所差别,其中树干生物量占最大比例,达到68.74%。试验地3树干净生产量最高为4.25thm-2a-1,占总净生产量比例71.55%;试验地4树干净生产量占总净生产量比例最高达到72.22%,为3.73thm-2a-1,试验地3、4的林分分别为成熟林和过熟林,适宜进行采伐利用。

The pinus massoniana of natural secondary forest are basically in the same geographic condition but of different age. The results showed that the total biomass is 195.25 t hm^-2, the majority is the arbor layer, 164.47 t hm^-2 （83.39% of the biomass）. The trunk as the most valuable part of Masson pine, which accounted for most of the volume of Pinus massoniana biomass. The biomass of arbor layer ratio increases with the kind of stand age and up to 73.27%. The trunk accounted for the largest proportion of single tree biomass, up to 68.74%. The net production capacity of the trunk up to 4.25 t hm^-2 a^-1 （71.55% of the total net production） in sample site 3, the percentage of the total net production up to 72.22%（3.73 t hm^-2 a^-1）in sample site 4. These two age of the stand near mature forest and mature forest are suitable for harvesting.