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对陕西省淳化县干旱阳坡立地上，１０年生人工油松侧柏混交林的研究结果表明，侧柏属浅根型树种，根系系集中分布在０～４０ｃｍ深的土层中，而油松根系在０～６０ｃｍ深的土壤中呈均匀分布。混交林的根系在土壤剖面上，垂直分布趋于均匀。行间混交林、株间混交林均能显著提高油松、侧柏的胸径、树高和材积生长量，同时能增强土壤中磷酸酶、蛋白酶和脲酶的活性，改善土壤肥力状况。尽管株间混交林能明显改善林地的土壤水分─物理性质，提高油松、侧柏的枝叶生物产量，但行间混交林在这些方面却表现出强烈的负效应。混交林对油松、侧柏针叶中的氨、磷含量的影响，随混交方式而截然不同。
The results of 10-year-old P. tabulaeformis plantations on a sunny and sunny slope in Chunhua County, Shaanxi Province showed that the root system of A. crus-galli was concentrated in 0-40 cm soil layer, Department of 0 ~ 60cm deep in the soil was evenly distributed. The root system of mixed forest in the soil profile, the vertical distribution tends to be uniform. Mixed forest, mixed forest can significantly increase Pinus tabulaeformis, Platycladus orientalis diameter, tree height and volume growth, and can enhance soil activity of phosphatase, protease and urease and improve soil fertility. Although the inter-plant mixed forest can obviously improve the soil moisture-physical properties of forest land and increase the branch and leaf bio-yield of Pinus tabulaeformis and Platycladus orientalis, the interplanting mixed forest shows a strong negative effect in these aspects. The effect of mixed forest on the ammonia and phosphorus content of Pinus tabulaeformis and Platycladus orientalis needles is quite different from that of mixed forest.