云南松林的生物量研究

本文研究了云南省易门县海拔1600—1700m的云南松中幼龄林分的生物量。云南松林的生物量随林龄的增加而增加。4年生林分的总生物量为9.985吨/公顷,11年生林分为27.874吨/公顷,23年生林分为69.852吨/公顷。乔木层的器官生物量分配比例随林龄而变化。针叶和树皮的分配比例随林龄的增加而迅速下降;干材和根的比例则不断上升,其中以干材增加最快;树枝的分配比例以11年生林分最大,23年生林分次之,4年生林分最小。

STUDIES ON THE BIOMASS OF PINUS YUNNANENSIS FOREST

Pinus yunnanensis, as an important species of silvicultural and commercial tree, is a kind of special coniferous tree widely distributed in the southwestern part of China. It grows rapidly, and is able to endure poor and dry soil. In this paper, the biomass of natural middle-young stands of Pinus yunnanensis in Yimen county of the central part of Yunnan province at elavations 1600-1700 m have been studied. Authors investigated three stands in the district. Their stand age is 4 -year, 11-year and 23-year respectively. 1. The total amount of middle-young stands of Pinus yunnanensis increases with increasing stand age. The total amount of biomass in the 4 -year-old stand is 9.985 t/ha, 11-year-old stand 27.874 t/ha, 23-year-old stand 69.852 t/ha. The biomass rate of tree layers in different layers of three stands increase rapidly with increasing stand age, but shrub and herb layers decrease constantly. 2. The relative distribution of pine organic biomass of tree layers in three stands varies with stand age. The biomass of needle and stem bark decrease with increasing stand age, but stem wood and root increase with stand age increasing. The percentage of branch of pine tree in the 11-year-old stand is the greatest, the 23-year-old stand as second, and the 4 -year-old stand the smallest.