abstract：

The purpose of this study is to investigate geochemical process and driving forces of soil heavy metals in the forest-dominated Jinshui River basin, tributary of the upper Hanjiang River. We carry out investigations on soil heavy metals distribution and transport patterns and driving forces by integrated analysis of natural environmental factors and human activities. In order to achieve these goals, we further employ efficient approaches including field investigation, laboratory testing and GIS spatial simulation. Through this research work, following findings are achieved. The contents of Pb and Zn are excessively paranormal of the riparian soil, and calcium carbonate has strong adsorption and solidification to Zinc element of the albic brown earths and calcic-skeletol soils. With increasing soil acidity, it might greatly deteriorate water quality and soil quality. The ecological risk of heavy metals pollution is intensified due to synergetic effect or antagonistic action and other environment factors. Cumulation action of heavy metals is slightly observed in geochemical process of riparian soil. The intensified human activities might increase the ecological risk of heavy metals pollution. It is important to improve contents of soil humus in order to alleviate heavy metals pollution and enhance soil self-purification.