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选择适宜的杉木初植密度,可以形成合理的群体结构,最大限度地利用地力和空间,促进幼树生长.本文根据本所杉木密度试验阶段观察资料和有关林分生长调查材料,对杉木初植密度的效应进行分析、探索,现将初探结果整理如下:材料和方法定位观测材料来自本所吉山杉木密度试验林.地形为山麓坡地和一级阶地,立地条件一般.土壤为苏南黄砂土和下蜀系黄岗土,质地分别为砂壤和重壤至轻粘,有效土层约0.50—0.70米.1975—1978年春造林,绿肥间作2年.栽植株行距有0.85—1.0×3.0、
Choosing the suitable planting density of Chinese fir can form a reasonable population structure and make the best use of the soil and the space to promote the growth of the young tree.In this paper, according to the observation data of the Chinese fir density test and the related survey materials, Density effect of the analysis, to explore, the preliminary results are summarized as follows: Materials and methods of positioning and observation of materials from the Institute of Chinese fir fir density test forest .Floor of the slope and a terraced slope, site conditions .Southern soil is yellow soil and Under the Shu Huanggang soil, the texture of sandy soil and heavy soil to lightly sticky, effective soil layer of about 0.50-0.70 meters .1975 - 1978 spring afforestation, green manure for 2 years. Planting row spacing 0.85-1.0 × 3.0,