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为了提高落叶松母树林经营水平,促使其稳产、高产和优质,我们结合基地建设,在河北省塞罕坝机械林场的阴河分场和河北省塞罕坝林管局龙头山林场与当地协作进行了有关试验,现将结果分述如下:一、试验材料和方法:在阴河分场三道沟华北落叶松母树林中设标准地17块,面积达1702亩。该处系缓坡阶地,土壤深厚肥沃,属生草棕壤。1964年春用二年生苗人工造林,栽植密度每亩333株,保
In order to improve the management level of Larix principis and forest and to promote its stable production, high yield and high quality, in combination with the construction of base, we cooperated with the local in Yinshe Sub-branch of Saihanba Machinery Forest Farm in Hebei Province and Longtoushan Forest Farm in Saihanba Forest Management Bureau of Hebei Province The relevant tests are as follows: First, the test materials and methods: In the Yinhe sub-Sandaogou North Larix principis and forests set up a standard 17, an area of 1702 acres. Department of gentle slope terrace, rich and fertile soil, grass is brown. Spring of 1964 with two years of artificial afforestation, planting density of 333 strains per acre, Paul