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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 Biogenic Elements in the Guanshan River Basin of Danjiangkou Reservoir
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.
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
biogenic elements / GeoDetector / influencing factors / water quality analysis / middle route project of South-to-North Water Diversion / Guanshan River Basin
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The riverine dissolved silicon (DSi) brings environmental information on biogeochemical processes of terrestrial surface, of which the input, transferring, transformation and output are influenced by many factors. Among the weathering of global silicate rocks, 31.53%~64.87% of DSi are intercepted by terrestrial vegetation and only about 12.9% are transferred into rivers. During being transported into ocean, riverine DSi gets impacts from aquatic biological absorption, reverse weathering process and artificial lake effect. The quantity of output is further reduced, which weakens the effect of the oceanic biological pump. According to limited data, the DSi concentration of global rivers has a large variation, ranging from 138 μmol/L to 218μmol/L. It is necessary to quantify contribution rates of influencing factors and establish output models controlled by multiple factors. The δ30Si of riverine DSi ranges from -0.2‰ to 3.4‰. Comparing with the δ30Si of silicate rock, which is about -0.5‰, the fractionation factor is significantly partial to positive from 0.3‰ to 3.9‰. That is because of the occurrence of kinetic fractionation process in river basin including inorganic and organic fractionation. Thus, the key problems, sources and transformation mechanisms of riverine DSi during migration and being transported should be solved in future. |
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With the promotion of “Great Protection of the Yangtze River”, the growth status of plankton in the Yangtze River water body has become an increasingly hot topic. Silicon, as one of the six source elements, is one of the factors that affect the growth and reproduction of plankton, and plays a vital role in the structure and stability of watershed ecosystem. In this paper, the morphological classification of silicon in rivers is introduced at first, and the significance of researching different forms of silicon is discussed. Subsequently, recent research findings in China and abroad are summarized, including the spatial and temporal distribution patterns of silicon concentration in Yangtze River Basin, and the factors which might affect silicon concentration distribution in rivers, reservoirs, and estuaries. In addition, the causes for the differences in silicon content between the Yangtze River and other rivers are compared and examined, the shortcomings of current researches are analyzed, and future research fields are prospected. The present research offers ideas and suggestions for corresponding research on the influence of silicon on the growth of plankton in the Yangtze River Basin.
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