WU Jiong¹, WU Qixin^1,*, AN Yanling², GAO Shilin¹, KE Xinhui¹, ZHOU Jinxiong¹, QIN Li¹ 

（1.Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang 550025, China; 2.Guizhou Institute of Technology, Guiyang 550003, China）

Abstract：The Chishui River is an important fish breeding area in the Yangtze River Basin and an important base for the production of liquor in China, which is of great ecological significance. The ecological environment of the Chishui River is generally good, with relatively low environmental background values and trace elements that are 'sensitive' to the impact of natural and anthropogenic processes on the water environment in the region. In order to illustrate the potential impact of human activities on river trace elements in the Chishui River Basin, a total of 34 surface water samples were collected from the mainstream of the Chishui River during the dry and wet season in 2017. Trace elements, including Li, Sr, As, Cd, Zn and Sb, in the water samples were analysed. The spatio-temporal characteristics were indicated using the One-way analysis of variance (ANOVA). In addition, the correlation analysis and?principal component analysis (PCA) were used to explore the major sources of the trace elements in the Chishui River. The results showed that?the concentration of As was significantly higher in the wet season than in the dry season. The concentrations of Zn and Sb during the dry season were significantly higher than those during the wet season, and others had no significant difference. There were significant differences between Li, Sr, Cd, and Sb in the upstream, midstream and downstream regions. The highest value of Cd was in the upstream, and the highest values of Li, Sr, Cd and Sb were in the midstream. The increase in Zn and Sb concentrations in the midstream was primarily due to anthropogenic input from urban activities. The concentrations of Li and Sr increased obviously in the midstream were affected by the superposition influence of natural geological background and urban input. The relatively high concentrations of As and Cd in the upper reaches were mainly controlled by the high geological background of the karst area in southwestern China, with the contribution of urban wastewater in the midstream. Anthropogenic input in the process of urbanization was the main reason for the significant increase of Zn, Sb, Li and Sr concentrations in the midstream region of the Chishui River.

Key words：Chishui river; trace elements; distribution characteristics; source analysis; anthropogenic inputs

EARTH AND ENVIRONMENT Vol.51, No.1, Tot No.351, 2023, Page 56