Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management
نویسندگان
چکیده
Harmful cyanobacterial blooms (CyanoHABs) are linked to increasing anthropogenic nitrogen (N) and phosphorus (P) inputs. However, CyanoHABs in many large lakes continue despite extensive abatement efforts, mostly focused on external P loading. Internal nutrient cycling can modify availability limitation; thus, understanding the relative importance of vs. internal loading is essential for developing effective mitigation strategies CyanoHABs. We estimated long-term budgets Lake Taihu, China, from mass balance models using monitoring input output data 2005 2018 quantify contributions The showed that 9% 63% annual N inputs, respectively, were retained lake. Denitrification removed 54% thus help explain rapid decreases lake concentrations summer limitation. Water column regeneration sustain over short term contributed 38–58% potential demand summer-fall, Microcystis-dominated blooms. release 23–90% demand, although Taihu was a net sink an scale. Our results show helps reductions Furthermore, leaving faster than P, thereby creating persistent Therefore, parallel loading, along with will be most reducing accelerate recovery process this other large, shallow lakes.
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ژورنال
عنوان ژورنال: Limnology and Oceanography
سال: 2021
ISSN: ['1939-5590', '0024-3590', '1939-5604']
DOI: https://doi.org/10.1002/lno.11700