中文摘要：

以纵向岭谷区景洪-思茅段公路沿线为研究区，通过公路不同地点样线布设，对不同土地类型、地形和公路距离下的98个样点进行了野外植被和环境因子调查及土壤采样，在土壤表层0～20cm重金属全量分析的基础上对影响其分布的环境因子做了相关分析，得出研究区路域土壤重金属污染的空间分异特征及其主要的影响因子，研究结果表明，公路沿线不同土地利用类型下土壤重金属元素的含量存在较大的差异，但不同类型下含量的变化趋势较为一致，草地重金属污染最为严重，而次生林、原始林重金属含量较低；土壤养分也受土地利用类型影响，但相关分析表明，除了pH值、总钾、总磷和重金属关系较为密切外，研究区其它土壤养分和重金属之间的含量相关不显著，重金属元素含量之间相关性显著，表明该段道路重金属污染具有同源性，即来自道路，距公路的距离对重金属含量影响较大，农田土壤重金属含量随距离公路增加逐渐降低，而自然土壤中，变化趋势呈波动趋势，进一步对自然土壤中重金属的影响因子做了分析，结果表明，地形影响重金属的含量垂直分异，而典范对应分析也显示研究区距离、地形、土地覆被和土壤特性共同作用于土壤污染的空间变异，影响程度为距离〉土地覆被〉地形〉土壤。

英文摘要：

To study the spatial variability of soil heavy metal contents along roadside and its influence factors, we sampled Jiughong-Simao road in the Longitudinal Range Gorge Region. Ninety-eight top-layer soil samples were collected and their quadrate environmental features were investigated under serial land use types, topography, and distances from road. Based on the analysis of heavy metals, we further discussed the relationships between heavy metals in soil and its main influencing factors. The results showed that there existed great difference of heavy metals in soil under different land use types. But different heavy metals exhibited similar tendency under different land uses. Grasslands were polluted most while secondary and primary forest soils have low heavy metal content. Though soil properties were affected by land uses, they are no significant relationships among soil heavy metals except pH, TK ,TP. The higher relationship between heavy metals suggests that the pollutants are homologous from road. Distances had great effect on soil heavy metal spatial variability which the content in farm field decreased with the distance off road. In the nature soils, the change exhibited fluctuation. To elucidate the fluctuation, we analyzed the vertical change of heavy metal content under different slope positions beside road. The results showed soil heavy metal levels differed as upper slope〈middle slope 〈 lower slope. Further, CCA method was used to find the effect of distance, topography, land cover and soil features. The relationship verified that the four factors together affect the spatial distribution, and the influencing order is distance, land cover, topography, and soil.