Seasonal dynamics of closed shallow lakes nutrient status controlled by lacustrine groundwater discharge.
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| Title: | Seasonal dynamics of closed shallow lakes nutrient status controlled by lacustrine groundwater discharge. |
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| Authors: | Sun, Xiaoliang1,2 (AUTHOR), Du, Yao1,2 (AUTHOR) yaodu@cug.edu.cn, Tian, Hao1,2 (AUTHOR), Xu, Jiawen1,2 (AUTHOR), Shi, Huanhuan1,2 (AUTHOR), Liu, Yetong1,2 (AUTHOR), Deng, Yamin1,2 (AUTHOR), Gan, Yiqun1,2 (AUTHOR), Wang, Yanxin1,2 (AUTHOR) |
| Source: | Hydrology & Earth System Sciences. 2026, Vol. 30 Issue 8, p2357-2372. 16p. |
| Subject Terms: | *Groundwater flow, *Eutrophication, *Water chemistry, *Biogeochemistry, *Seasons, *Lakes |
| Abstract: | Lacustrine groundwater discharge (LGD) and its associated nitrogen (N) and phosphorus (P) inputs are increasingly recognized as the critical drivers of lake eutrophication. However, the intermonthly variability in LGD and its influence on lake nutrient dynamics remain poorly understood. In this study, high-frequency monitoring and hydrochemical analyses were conducted over a full hydrological year to investigate LGD-related nutrient fluxes and their effects in a typical oxbow lake in the central Yangtze Basin. Water level data and 222Rn tracing revealed a seasonal LGD pattern characterized by an increase from summer to winter, followed by a decline from winter to spring, with LGD rates ranging from 35.36–51.71 mmd-1. This pattern was regulated by monthly net precipitation, which controlled the lake level fluctuations and LGD rates. The corresponding N and P loads varied synchronously with LGD and showed seasonal synchrony with lake N and P concentrations. Moreover, variations in the N / P ratio carried by LGD regulate the lake water N / P ratio, thereby influencing its relationship with the dynamic changes in chlorophyll- a. A large number of typical closed shallow lakes similar to the studied cases exist worldwide, and therefore, the regulatory role of LGD on lake nutrient status revealed in this study can be reasonably extended to other closed shallow lake systems. This study provides the first evidence that groundwater-driven nutrient loading influences lake nutrient status on an intermonthly scale, offering new insights and management strategies for eutrophication control in closed shallow lake systems worldwide. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | Lacustrine groundwater discharge (LGD) and its associated nitrogen (N) and phosphorus (P) inputs are increasingly recognized as the critical drivers of lake eutrophication. However, the intermonthly variability in LGD and its influence on lake nutrient dynamics remain poorly understood. In this study, high-frequency monitoring and hydrochemical analyses were conducted over a full hydrological year to investigate LGD-related nutrient fluxes and their effects in a typical oxbow lake in the central Yangtze Basin. Water level data and 222Rn tracing revealed a seasonal LGD pattern characterized by an increase from summer to winter, followed by a decline from winter to spring, with LGD rates ranging from 35.36–51.71 mmd-1. This pattern was regulated by monthly net precipitation, which controlled the lake level fluctuations and LGD rates. The corresponding N and P loads varied synchronously with LGD and showed seasonal synchrony with lake N and P concentrations. Moreover, variations in the N / P ratio carried by LGD regulate the lake water N / P ratio, thereby influencing its relationship with the dynamic changes in chlorophyll- a. A large number of typical closed shallow lakes similar to the studied cases exist worldwide, and therefore, the regulatory role of LGD on lake nutrient status revealed in this study can be reasonably extended to other closed shallow lake systems. This study provides the first evidence that groundwater-driven nutrient loading influences lake nutrient status on an intermonthly scale, offering new insights and management strategies for eutrophication control in closed shallow lake systems worldwide. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10275606 |
| DOI: | 10.5194/hess-30-2357-2026 |
