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森林的天然更新问题,在林业事业上具有很大的意义。油松(Pinus tabulaeformis)是华北山地的重要成林树种,可是关于油松的天然更新,却只能找到极少的文献。我们研究油松天然更新的目的,即在于,通过对它的成林过程规律的了解,为制定各种营林措施(尤其是主伐方式和林分改造)提供必要的依据。研究工作是1960—1962年在河北省承德地区平泉县大窝铺林场进行的。此外,本文中也部分地利用了我们1959年在山西省太岳林区灵空山经营所的调查材料。这两个地区都是天然油松林分布比较集中的地区。我们区分林型来研究林冠下的天然更新。每个林型一般选4—10块标准地。在每块标准地上实测立木因子,记载下木和活地被物的种类、多度和盖度以及土壤的剖面形态特征。在每块标准地的对角线上机械等距地设置20—25块样方(有时为了确定地形部位对
The natural renewal of forests has great significance in forestry. Pinus tabulaeformis is an important forest tree species in the mountainous area of North China. However, only a few references have been found on the natural regeneration of Pinus tabulaeformis. We study the natural regeneration of Pinus tabulaeformis, that is, through its understanding of the law of forestation process, to provide the necessary basis for the development of various silvicultural measures (especially the main cutting methods and reforestation). The research work was carried out from 1960 to 1962 in Taiwopu Forest Farm, Pingquan County, Chengde District, Hebei Province. In addition, this article also makes partial use of the survey materials of our Lingkang Mountain Management Office in Taiyuelin District, Shanxi Province in 1959. Both areas are the areas where the distribution of natural Pinus tabulaeformis is relatively concentrated. We distinguish the forest type to study the natural regeneration under the canopy. Each forest type generally choose 4-10 standard. Rickettsial factors were measured on each standard plot and the species, abundance and coverage of the off-lay and ground cover, as well as the profile characteristics of the soil. On each diagonal of the standard set of 20-25 quadratically equidistant (sometimes to determine the location of the terrain