The results of PCA and CA indicated that the metal accumulations of riparian wetlands of PNA in PRE are mainly caused by the disturbances of human activities. The results are in consistent with the findings reported by Ip et al. [42] that the increase in trace metals in the PRE sediments since 1970s may mainly come from anthropogenic sources of rapid development of industry and urbanization. The study identified anthropogenic activities as a major source of heavy metal contamination of riparian wetlands and the environment protection need for policy intervention in anthropogenic pollution management.