[目的]研究永定河河滨带土壤机械组成特征及异质性分析,为河滨带土壤改良及生态修复提供理论参考.[方法]采用室外定点采样与室内测定分析相结合的方法,研究了永定河河滨带不同地段上下层(0～10、10～20cm)土壤的机械组成.[结果]永定河河滨带土壤机械组成中主要以砾石含量为主,黏粒含量较少,均低于5%.在砾石类组分上,10～20cm含量大于0～10cm含量,沙粒、粉粒则表现出0～10cm含量大于10～20cm含量,黏粒含量上下层间变化不明显.上、中、下游砾石、沙粒、粉粒含量变化幅度较大,而黏粒变化不明显.[结论]应根据土壤状况合理施肥,改良中要注意土壤机械组成恢复的合理结构.%[ Objective ] The aim was to research characteristics of soil mechanical composition and heterogeneity analysis of river beach inYongding River and provide theoretical reference for ecological restoration. [ Method ] Using outdoor fixed-point sampling and indoor analysis method,soil mechanical composition of different sections in the Yong ding River was studied. [ Result] The results showed that in Yongding River the soil mechanical composition was content of gravel,clay content was less, but all less than 5 ％. In components of the gravel class, 10 -20 cm content was greater than 0 - 10 cm, sand, silt content showed 0 - 10 ｃm content was greater than 10 -20 cm, between the upper and lower clay content did not change significantly. [ Conclusion ] Rational fertilization should be based on soil conditions, improvement should pay attention to the reasonable structure of soil mechanical composition.
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