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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 .这也是调查地内没有成年辽东栎的原因之一
Based on the field investigation materials of the Pinus tabulaeformis genetic conservation forest in Taiyue District of Shanxi Province, the composition and structure of the forest were preliminarily analyzed.The species of plants in the survey area is rich, of which the species of woody plants account for about 60% 15.5%; the dead wood was dominated by small-diameter woods.The Pinus tabulaeformis forest was a secondary forest of the same age formed by some kind of disturbance before 60 ~ 70 years ago, and appeared around 40 ~ 50 years old A small disturbance.The shape of Pinus tabulaeformis was higher than the value of (H / D) due to the density too high.The seedlings of Pinus tabulaeformis seedlings were concentrated in the gap in the regeneration layer, while the seedlings of Liaodong oak were evenly distributed in the survey area, but not Which means that the seedlings of Hippophae rhamnoides L. were more tolerant of light but had sufficient light after a certain age.This is also the reason why there is no adult Quercus liaotungensis in the surveyed area one