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通过对晋西黄土地区造林密度的研究，得到刺槐的合理初植密度为２３３０株／ｈｍ２；油松为３６７０株／ｈｍ２；根据林木水量平衡分析，得到单株林木水分营养面积的确定公式和合理成林密度的确定公式，据此算出不同径阶刺槐林和油松林合理成林密度表。研究结果表明，该地区现有防护林体系无论是初植密度，还是成林密度均偏大。
Through the study on the afforestation density in the loess area in western Shanxi, the reasonable planting density of Robinia pseudoacacia was 2330 plants / hm2 and that of Pinus tabulaeformis was 3670 plants / hm2. According to the water balance analysis of forest tree, the formula of water nutrient area per plant was obtained and reasonable Determine the density of forest into the formula, thus calculated different diameter order Robinia pseudoacacia and Pinus tabulaeformis forest density table. The results show that the existing shelterbelt system in the area is not only the initial planting density, but also the larger planting density.