丹江口水库官山河流域生源要素分布特征及影响因素  

Distribution Characteristics and Influencing Factors of BiogenicElements in the Guanshan River Basin of Danjiangkou Reservoir

作　　者：吴颐杭 张乾柱[1] 罗袁 卢阳[1] 金可 WU Yi-hang;ZHANG Qian-zhu;LUO Yuan;LU Yang;JIN Ke(Chongqing Branch,Changjiang River Scientific Research Institute,Chongqing 400026,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]长江科学院重庆分院,重庆400026 [2]重庆交通大学河海学院,重庆400074

出　　处：《长江科学院院报》2024年第10期69-77,共9页Journal of Changjiang River Scientific Research Institute

基　　金：武汉市2022年度知识创新专项-曙光计划项目(2022020801020245);中央级公益性科研院所基本科研业务费项目(CKSF2023299/CQ,CKSF2021744/TB);国家重点研发计划项目(2021YFE0111900)。

摘　　要：研究河流水体生源要素空间分布特征及影响因素对流域水质管理至关重要。以丹江口水库官山河流域为例,分析枯水期水体生源要素的变化特征,基于地理探测器模型探究气象、地形、土地利用、人类活动等因素对生源要素的单一影响与交互影响。结果表明,官山河枯水期水体呈弱碱性,大多处于富氧状态,干流水体溶解氧(DO)、总溶解固体(TDS)浓度等参数存在明显的空间变异性,但干流与支流水体基本理化参数总体差异不显著。水体溶解性碳以无机碳为主,C、N、P、Si浓度低于我国部分南方河流,且存在显著的空间差异,水质状况总体良好。生源要素浓度之间存在一定的相关性,降水、气温和高程等因素可以较好地解释溶解无机碳(DIC)和溶解硅(DSi)质量浓度变化,土地利用类型之间、土地利用与降水等因素之间的交互作用可以显著提升对生源要素浓度变化的解释力度。研究结果对南水北调中线水源涵养区水环境保护具有重要意义。Studying the spatial distribution and influencing factors of biogenic elements is crucial for effective water quality management.We analyze changes in biogenic elements during dry season in the Guanshan River,a major tributary of the Danjiangkou Reservoir.We employed GeoDetector to assess the individual and interactive effects of meteorological conditions,terrain,land use,human activities,and other factors on biogenic elements.Findings indicate that during dry season,the Guanshan River is slightly alkaline and predominantly oxygen-rich,and exhibits significant spatial variability in parameters such as dissolved oxygen(DO)and total dissolved solids(TDS)along the main stream,though basic physical and chemical parameters do not differ notably between the main stream and tributaries.Inorganic carbon predominates in the river’s dissolved carbon content.The concentrations of carbon(C),nitrogen(N),phosphorus(P),and silicon(Si)are lower compared to some southern rivers in China,with notable spatial variations.The river does not exhibit eutrophication,and its water quality is generally good.A correlation exists among the concentrations of biogenic elements,with variations in dissolved inorganic carbon(DIC)and dissolved silicon(DSi)mass concentrations being effectively explained by precipitation,temperature,and elevation.Interactions among land use types and between land use and factors such as precipitation significantly enhance the interpretation of changes in biogenic element concentrations.These results are important for water environmental protection in the water conservation area of the Middle Route of the South-to-North Water Diversion Project.

关 键 词：生源要素 地理探测器 影响因素 水质分析 南水北调中线工程 官山河流域 

分 类 号：X824[环境科学与工程—环境工程]