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对油松、刺槐人工混交林和油松纯林生长状况及土壤肥力进行了样地调查。其结果表明,在0～20cm土层中,混交林土壤总孔隙度、田间持水量、土壤pH值分别比油松纯林增大7.59%、2.31%、6.46%;土壤容重和可溶盐含量分别减小1.63%和10.88%。混交林土壤有机质、碱解氮、有效磷含量分别比油松纯林增大10.95%、15.80%、12.02%;速效钾含量减小1.36%。油松在混交林中,树高、胸径和单株材积生长量分别比油松纯林增大5.32%、5.11%和19.51%。因此,混交林能有效改善土壤理化性质,提高土壤肥力,促进林木生长,增加经济收益。
Site surveys were conducted on the growth status of Pinus tabulaeformis and Robinia pseudoacacia mixed forest and Pinus tabulaeformis pure forest and soil fertility. The results showed that in 0 ~ 20cm soil layer, total soil porosity, field water holding capacity and soil pH increased by 7.59%, 2.31% and 6.46%, respectively. Soil bulk density and soluble salt content Decreased by 1.63% and 10.88% respectively. The contents of soil organic matter, available nitrogen and available phosphorus in the mixed forest increased by 10.95%, 15.80% and 12.02%, respectively, and the content of available potassium decreased by 1.36%. Pinus tabulaeformis in mixed forest, tree height, diameter at breast height and volume per plant were increased by 5.32%, 5.11% and 19.51% respectively. Therefore, mixed forest can effectively improve the physical and chemical properties of the soil, improve soil fertility, promote forest growth, increase economic benefits.