Effects of Landscape Features on the Roadside Soil Heavy Metal Distribution in a Tropical Area in Southwest China

Soil heavy metals along roadsides pose a great threat to ecosystems while their spatial variations and influencing factors still remain unclear in some regions, especially tropical areas with complex landscape characteristics. Our study was carried out determine how the land use, vegetation characteristics, topographical distance road affect soil metal distribution. Taking Jinghong county Yunnan Province, Southwest China as case, samples were collected at different distances off roads canonical correspondence analysis (CCA) methods used relative importance of factors. results showed that sources obtained mainly from road, based on principle component (PCA) identification. There no obvious trends quality index (SQI) natural soils, SQI nutrients farmlands had decreasing increasing trend, respectively, which could both be expressed by logarithm models. However, properties little differences for levels they significant under use types. The CCA further soils jointly affected distance, plant coverage, elevation order.