广东省7大流域地表水溶解氧分布特征及影响因素  

Distribution and Influencing Factors of Dissolved Oxygen in Surface Water of the Seven Major River Basins of Guangdong Province

作　　者：许泽婷 余香英 徐闯 熊津晶 祝明月 XU Zeting;YU Xiangying;XU Chuang;XIONG Jinjing;ZHU Mingyue(Guangdong Provincial Academy of Environmental Science,Guangzhou 510045,P.R.China;Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou 510045,P.R.China)

机构地区：[1]广东省环境科学研究院,广东广州510045 [2]粤港澳环境质量协同创新联合实验室,广东广州510045

出　　处：《水生态学杂志》2025年第2期52-61,共10页Journal of Hydroecology

基　　金：广东省重点领域研发计划项目(2020B1111350001);广东省环保专项资金项目(粤财预[2024]4号);广东省环境科学研究院科技创新项目(HKYKJ-202201)。

摘　　要：溶解氧是衡量水环境质量和生态系统健康的关键参数,研究广东省7大流域地表水溶解氧的分布特征及其调控因素对于流域水环境管理具有重要意义。基于2022年广东省地表水监测断面数据,系统分析了7大流域溶解氧浓度在月度、季节、水期3个时间尺度上的分布特征,采用Pearson相关性系数和lindeman-merenda-gold(LMG)模型分析方法,研究了各流域全年和汛期溶解氧影响因素及相对贡献。结果表明广东省溶解氧浓度分布存在时空异质性,空间上,整体呈现从西北内陆向东南沿海逐渐降低的趋势;时间上,呈现冬季高、夏季低,非汛期高、汛期低的特征。北江、西江、韩江流域水资源充沛,人类开发利用程度相对较小,在全年尺度上溶解氧浓度变化以水温为主导,对溶解氧的相对贡献率占比超50%。东江流域河源段开发利用程度较小,流经惠州后人类活动增强,但总体来看,溶解氧在全年尺度上仍以水温为主导。粤东诸河、粤西诸河、珠三角等沿海流域一方面受上游污染输入影响,另一方面区域内社会经济活动发达,污染排放压力大,在全年尺度上,污染要素(高锰酸盐指数、氨氮、总氮、总磷)和水温共同影响溶解氧浓度。在汛期,各流域溶解氧的调控因子从水温向污染要素转变,水温对溶解氧的相对贡献率下降19%~54%,污染要素的相对贡献率上升18%~41%,全省溶解氧浓度受汛期面源污染制约明显,汛期面源污染治理工作仍有待深入推进。Dissolved oxygen(DO)is a key parameter for assessing water environment quality and ecosystem health,so investigating the spatiotemporal patterns and influencing factors of DO levels is important for managing the water environment.Based on 2022 surface water monitoring data for Guangdong Province,we analyzed the spatiotemporal pattern of DO in the seven major river basins at different time scales(month,season,and water year).Pearson correlation and the Lindeman-Merenda-Gold(LMG)model were used to clarify the relationships between exogenous influencing factors and DO,as well as their relative influence on the DO in each river basin,both annually and during flood season.The distribution of DO concentrations in Guangdong Province was spatially and temporally heterogeneous.Spatially,the DO concentration gradually decreased from the northwest inland rivers to southeast coastal rivers.Temporally,the DO concentration was generally high in winter and low in summer,and high in the dry season and low in flood season.Due to abundant water resources and relatively low exploitation and utilization intensities,water temperature was the primary influencing factor on DO concentrations in the Beijiang,Xijiang and Hanjiang river basins throughout the year,with a cumulative relative contribution above 50%.Human activity intensity in the upper Dongjiang River basin was small,but increased after Huizhou,but the overall annual DO concentration was affected by water temperature.Due to upstream pollution inputs and high pollution releases due to developed socio-economic activities,the DO concentrations in the river basins of eastern Guangdong,western Guangdong,and the Pearl River Delta are affected by both water temperature and pollutant inputs(permanganate index,ammonia nitrogen,total nitrogen,and total phosphorus).During the flood season,the primary driving factor of DO concentration changed from water temperature to pollutant inputs.The relative contribution of water temperature decreased by 19%-54%,while the contribution of pollutant

关 键 词：溶解氧 时空特征 lindeman-merenda-gold(LMG)模型 广东省7大流域 

分 类 号：X824[环境科学与工程—环境工程]