Abstract: To understand water ecological environment of Dawen River and the influence of land use type along the riparian zone, we conducted a survey on water ecology of Dawen River basin in April 2017. Principal component analysis and correlation analysis were used to screen and optimize a total of 19 candidate indicators in five aspects including watershed topography, hydrology, water environmental factors, major aquatic biological factors, and habitat quality. By analyzing weight coefficient of those indicators, a multiindicator assessment system for river ecosystem health in the Dawen River basin was constructed. The results showed that water environmental factors and aquatic organisms had a large weight in the health evaluation index system. The health status in the basin was dominated by general and poor grades, accounting for 58.33% and 20.83% of the total sampling points, respectively. The upper section of Yingwen River and southern tributaries of Dawen River, and the lower section of the main stream of the Dawen River were at excellent or good level. The area of urban village, industrial and mining land, farmland and traffic land were negatively correlated with water ecological health comprehensive index of Dawen River, which were the main factors responsible for the destruction of water ecosystems of the basin.

Key words: photosynthesis., cation, salt, Phyllostachys vivax, Ph. glauca