Heihe River Basin Water Environmental Quality Assessment

• 1、School of Life Science, Lanzhou University, LanZhou 730000
• 2、School of Life Sciences，Lanzhou University
• 3、Sharma Forest, Tianzhu Tibetan Autonomous County, Gansu Province
• 4、School of Life Sciences,Lanzhou University

Abstract：Heihe River Basin is the second largest inland river in the northwest,which is in the arid and semi-arid regions, whose water quantity and quality conditions should be concerned. The author, use fuzzy comprehensive evaluation method to analyze the water quality of the Heihe River Basin through collected water quality data of field sampling points, and arcgis software interpolation analysis to get surface data map, more intuitive display the difference between watershed water quality, and results are as follows: Heihe basin overall water quality are most class Ⅱ water and most of water I-III; water quality, is in good condition in upstream, and mild pollution in midstream and downstream, and the middle reaches of the heavier pollution than the downstream; total phosphorus and total nitrogen in the water body pollutants are the main impact factors of water pollution; spatial variation of watershed and water quality characteristics: salinity and otal hardness increase from upstream to downstream overall; total phosphorus, total nitrogen, ammonia nitrogen content and hypermanganate index in the midstream reaches of higher concentration, lower concentration of the remaining area, which is caused by the more frequent human activity factors in the middle area (Zhangye agricultural irrigation area).

Keywords： Heihe River Basin Water Quality Assessment Interpolation analysis