| 摘要 |
To investigate the characteristics of water environmental pollution in the Nenjiang River Basin, five monitoring sections, including Zhenxi, Xianghai Reservoir, Baishatan, Yuelianghu Reservoir, and Da’an, were selected. Utilizing water quality monitoring data collected from 2013 to 2022, the fuzzy comprehensive evaluation method was employed to systematically analyze the spatiotemporal variation patterns of water quality, assess the current pollution status, and identify the influencing factors of non-point source pollution. The results indicated that the concentrations of representative pollutants at five sections in the lower reaches of the Nenjiang River generally exhibited a downward trend, accompanied by an overall improvement in water quality. However, the degree of improvement varied considerably among the different sections. Specifically, the water quality of the main stream of the Nenjiang River (Baishatan and Da’an) improved from Class IV to Class III. In contrast, the Xianghai Reservoir consistently remained at Class V or below, primarily due to excessive fluoride levels. The water quality at Yuelianghu Reservoir and Heidimiao Section demonstrated a fluctuating but overall improving trend. Based on the analysis of pollution sources, targeted recommendations are proposed, including regulating the ecological water requirements of rivers, restoring wetland ecosystems, and enhancing the management of non-point source pollution. These measures offer scientific support for water quality management and ecological conservation in the river basins. |
