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一、掌握造林地的基本条件为了使丘陵区杉、檫造林少花工、少投资、收效大,尽可能扩大造林面积,造林地的选择既要做到适地适树,又要充分估计到人的主观能动作用。1.林地土层要有一定的厚度。土层厚薄在一定程度上反映土壤的水肥条件,改良的难易,根据正常快速生长要求,杉、檫根系垂直密布范围须达到50厘米,杉、棕造林地土层厚度应不少于60厘米。2.林地土壤石砾含量不宜太多。丘陵地区土壤石砾含量愈多,土壤愈紧实干
First, to grasp the basic conditions of afforestation In order to make the hilly area fir, afforestation less flower workers, less investment, effective large, as far as possible to expand afforestation area, afforestation should not only choose the appropriate tree, but also fully estimated People’s subjective initiative. 1. Forest soil layer to have a certain thickness. The thickness of soil layer reflects the soil water and fertilizer conditions to a certain extent, and the improvement is easy. According to the requirements of normal rapid growth, the vertical density of cedar and root system must reach 50 cm. The thickness of soil layer of fir and brown afforestation should not be less than 60 cm . 2. Woodland soil gravel content should not be too much. The more soil gravel in the hilly region, the harder the soil is