富营养化
地下水
优势(遗传学)
水华
生物地球化学循环
环境科学
营养物
地下水排放
水文学(农业)
营养污染
湖泊生态系统
生态学
海洋学
生态系统
浮游植物
地质学
含水层
地下水补给
生物
生物化学
岩土工程
基因
作者
Shi Xiao-yan,Xin Luo,Jiu Jimmy Jiao,Jinchao Zuo
出处
期刊:Water Research
[Elsevier]
日期:2022-05-16
卷期号:219: 118620-118620
被引量:16
标识
DOI:10.1016/j.watres.2022.118620
摘要
• Evaporation is the primary driving force of groundwater discharge in shallow lakes. • Groundwater borne nutrients shape nutrient state and algal blooms in shallow lakes. • Distinctive time lag is observed between lake and LGD N: P ratios. As global threats to freshwater lakes, eutrophication and harmful algal blooms (HABs) are governed by various biogeochemical, climatological and anthropogenic processes. Groundwater is key to join these processes in regulating HABs, but the underlying mechanisms remain unclear. Here, we leveraged basin-wide field data of Lake Taihu (China's largest eutrophic lake) and global archives, and demonstrate the dominance of evaporation on lacustrine groundwater discharge (LGD) in shallow lakes. We extrapolated decadal LGD and the derived nutrient loadings and found that HABs promptly consume ubiquitous groundwater borne nutrients, leading lake water N: P ratios 2–3 months time lagged behind LGD N: P ratios. We conclude that evaporation dominated LGD is an unraveled but crucial regulator of nutrient states and HABs in shallow lakes, which advocates synergistical studies from both climatological and hydrogeological perspective when restoring lake ecosystems.
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