黄土高原沙棘、刺槐人工林对土壤的培肥效应及其模型

Improving Effect of Seabuckthorn and Black Locust Artificial Forests to Soil Fertility in Loess Plateau and Its Model

采用肥力解析断面分析法研究了黄土高原沙棘、刺槐人工林对土壤的培肥效应，结果表明：①黄土高原沙棘、刺槐人工林能大幅度提高土壤的肥力水平。与无林地相比，５年生沙棘及３３年生刺槐人工纯林可使８０ｃｍ土层土壤有机质、全Ｎ、有效Ｎ、有效钾、代换量分别提高４１１％，６０４％，１０９７％，５８％，１２４％及７４３％，１２３６％，２８５３％，４２４％，６３７％；②沙棘、刺槐林对土壤的培肥效应随深度增加而减小，其变化趋势符合Ｙ＝Ａ＋Ｂｌｎｈ模型；③沙棘人工林对土壤有机质、全Ｎ及有效Ｎ的提高幅度大于刺槐。

Through studying the improving effect of seabuckthorn and black locust artificial forests in loess plateau to soil fertility with soil profile fertility analysis method. The results indicated that: ① The soil fertility can be enhanced greatly by the seabuckthorn and black locust artificial forests of the loess plateau. The soil organic matter, total nitrogen,available nitrogen, available potassium, CEC (cation exchange capacity) of 0～80cm soil horizon increased 41 1%,60 4%,109 7%,5 8%,12 4% by the seabuckthorn artificial forest, and 74 3%,123 6%,285 3%,42 4%,63 7% by the black locust artificial forest, respectively. ② The improving effect of the seabuckthorn and black locust artificial forests to soil fertility decreased with the soil depth increasing, and the tendency can be described by the model of Y=A+B ln h; ③ The improving effect of the seabuckthorn artificial forest to soil organic matter, total nitrogen, available nitrogen is greater than the black locust artificial forest.