| 作者单位 |
1. Yunnan New Century Academy of Environmental Protection, Kunming, Yunnan 650032, China; 2. Yunnan Society for Environmental Sciences, Kunming, Yunnan 650032, China; 3. Yunnan Minzu University, Kunming, Yunnan 650504, China |
| 摘要 |
To conduct a comprehensive analysis of the current status of water environment quality in Yilong Lake, a systematic study was undertaken to characterize the evolution of water quality. This study utilized monthly data on water quality indicators collected from three monitoring sections of Yilong Lake between 2016 and 2023, employing the Mann-Kendall trend test and ArcGIS spatial interpolation technique. The results indicated that the five-day biochemical oxygen demand (BOD5), total nitrogen (TN), and chlorophyll a (Chla) exhibited an overall increasing trend, whereas other indicators demonstrated a decreasing trend. The permanganate index (PI), chemical oxygen demand (COD), TN, and Chla were observed in the following order: east of the lake > middle of the lake > west of the lake. In contrast, the BOD5 and total phosphorus (TP) were ranked as west of the lake > east of the lake > middle of the lake. Additionally, ammonia nitrogen (NH3-N) was found to be in the order of east of the lake > west of the lake > middle of the lake, while transparency was ranked as west of the lake > middle of the lake > east of the lake. Urban domestic sewage, effluent from industrial parks, domestic waste generated by rural residents’ production and daily activities, agricultural waste, wastewater from decentralized farming, domestic sewage, and point source discharges from the soybean processing industry are the primary contributors to the exceedance of water quality standards. The enhancement of a precise pollution control system, along with the regulation of pollution sources and the interception of pollutants, can significantly diminish the pollution load entering the lake. This approach is essential for the protection and restoration of river and lake ecosystems, thereby facilitating the gradual recovery of their ecological functions. Additionally, the implementation of ecological water replenishment and the recycling of water resources can improve the capacity of the water environment. Furthermore, bolstering scientific and technological support, as well as comprehensive supervision and assurance measures, is crucial to ensuring that water quality remains stable and adheres to established standards. |
