【摘要】 [目的]为防治草地退化和恢复植被生长提供理论依据。[方法]通过对三江源地区果洛、玉树不同退化程度草地进行化学性质分析,了解该地区退化草地土壤中养分含量的变化。[结果]不同退化程度草地土壤的速效氮、速效磷、速效钾、有效锌、有机质的平均含量差异极显著(P<0.01),随着退化程度的加大和土层的加深,其含量逐渐降低;有效铜平均含量差异极显著(P<0.01);有效锌含量无明显的变化规律,变化范围为1.36~3.08 mg/kg;随着土层的加深,有效铜含量上升,有效锌含量下降。演替度与不同退化程度草地土壤养分含量无明显的变化规律。[结论]根据退化草地土壤的养分含量,在治理时应补施不同的肥料。更多还原

【Abstract】 [Objective] The research aimed to provide the theoretical basis for controlling the grassland degradation and recovering the growth of vegetation.[Method] Through analyzing the chemical prosperities of grassland with different degradation degree in Guoluo area and Yushu area of Sanjiangyuan,the changes of nutrient content in the soil of the degraded grassland in this region was understood.[Result] The average contents of available N,available P,available K,available Zn and organic matter in the soil of grassland with different degradation degree had an extremely significant difference(P<0.01.With the increasing of the degradation degree and the deepening of soil layer,their contents were gradually decreased.The average content of available Cu had an extremely significant difference(P<0.01).The content of available Zn had no obvious change law,with the change range of 1.36～3.08 mg/kg.With the deepening of soil layer,the content of available Cu was increased and the content of available Zn was decreased.The succession degree and the nutrient content in the soil of grassland with different degradation degree had no obvious change law.[Conclusion] According to the nutrient contents in the soil of the degraded grassland,the different fertilizers should be supplemented in the control process.更多还原