Enrichment Characteristics and Cause Analysis of Phosphorus in Lateral Interaction Zone of the Yangtze River in Four Lake Basin
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摘要:
为了探究长江侧向交互带地下水中磷的富集特征与成因机制，以四湖流域内江陵、监利、洪湖3条侧向交互带为研究对象，开展了水化学和磷酸盐氧同位素（δ18Op）的分析.结果发现交互带地下水中普遍存在磷的显著富集区，潜水和承压水中富集位置存在差异.水化学分析显示监利断面磷富集主要受有机质矿化驱动，江陵断面与矿物溶解释放关系更为密切，而洪湖断面则受到了二者的共同调控.δ18Op证实了微生物磷循环参与诱导铁氧化物表面磷的还原溶解释放对承压水磷富集的重要作用.交互带磷富集的空间分异和主导机制受到水文过程调控，较强的水文过程促进有机质对磷富集的作用并使富集区更靠近长江.
Abstract:To investigate the enrichment characteristics and underlying mechanisms of phosphorus (P) in groundwater within the river lateral interaction zone, this study conducted hydrochemical and phosphate oxygen isotope (δ18Op) analyses on three lateral interaction zones (Jiangling, Jianli, and Honghu) within the Four Lake basin. The results reveal the widespread presence of significant P enrichment zones in the groundwater of the interaction zones, with the locations of enrichment differing between the unconfined and confined aquifers. Hydrochemical analysis indicats that P enrichment in the Jianli section is primarily driven by organic matter mineralization. In contrast, in the Jiangling section, it is more closely related to mineral dissolution/release. The Honghu section appears to be regulated by a combination of both processes. The δ18Op data confirmed the crucial role of microbially mediated reductive dissolution of P from iron oxides in the enrichment of P in the confined aquifer. The spatial variation and dominant mechanisms of P enrichment in the interaction zones are regulated by hydrological processes. More intense hydrological dynamics enhance the role of organic matter in P enrichment, shifting the enrichment zone closer to the Yangtze River.
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Key words:
- groundwater /
- interaction zone /
- phosphorus /
- phosphate oxygen isotope /
- Four Lake basin /
- environmental geology
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图 1 研究区地理位置及采样点分布
Fig. 1. Location of the study area and distribution of sampling sites
图 3 3条交互带中磷的形态及含量分布
Fig. 3. Distribution of phosphorus species across the three interaction zones
图 4 3条交互带中各监测点承压水中NH4+∶TDP比值
Fig. 4. NH4+∶TDP ratio in the confined water at each monitoring site across the three interaction zones
图 5 3条交互带中TOC的含量分布
Fig. 5. Distribution of TOC concentrations across the three interaction zones
图 7 交互带承压水中Fe2+和Δ18Op关系
Fig. 7. Relationship between Fe2+ and Δ18Op in the confined water of the interaction zones
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