太岳山油松基因保护林的研究(Ⅰ)——林分组成与结构的研究

Study on the gene conserved stand of Pinus tabulaeformis in Taiyue Mountain(Ⅰ) ——study on the stands composition and structure.

该文依据山西太岳林区油松基因保护林的外业调查材料 ,对该林分的组成和结构做了初步分析 .调查地的植物种类丰富 ,其中木本植物种类约占太岳林区的 1 5 .5 % ;枯死木以小径级木为主 .油松保护林是在 6 0～ 70a前 ,受某种干扰后形成的相对同龄次生林 .大约在 40～ 5 0年生时 ,出现过一次小的干扰 .由于密度过大 ,油松的形状比 (H/D)值偏高 .更新层中 ,油松幼苗集中在林隙中 ;而辽东栎幼苗均匀分布在调查地中 ,但不能成为更替层 .说明两树种在幼苗阶段对光的要求不同 ,油松幼苗喜光 ;辽东栎幼苗较耐荫 ,但在一定年龄之后必须有足够的光照 .

Based on the field investigation data about the gene conserved stand of Pinus tabulaeformis in Taiyue Mountain of Shanxi, it's composition and structure have been analysized preliminarily. The plant species at the investigation spot are abundant,among which the woody plant species occupy about 15.5?% the of Taiyue forest region;the dead trees are mainly small logs. The gene conserved stand of Pinus tabulaeformis was formed by age of 60～70 ,and is secondary stand in comparatively the same age range after disruption. About 40～50 years, a small disruption has been taken place.Because of the high density , the shape ration (H/D) of Pinus tabulaeformis is slighely higher than the normal. In the reqenation layer, the seedlings of Pinus tabulaeformis concentrate in the gap,while the seedllings of Quercus liaotunensis are well distributed in the standard spot,but can not develop into the reqeneration layer.From mentions above,it is concluded that at the seedling stage,the requirement of these two kinds of tree to light are different,the seedlings of \%Pinus tabulaeformis\% are affinite to light, while the seedlings of Quercus liaotunensis endure shade better,but need enough light after certain ages, which is one of the reasons that there are no mature trees of Quercus liaotunensis at the investigation spots.