Retention of nitrogen and phosphorus in Lake Chaohu, China: implications for eutrophication management

Wang, Yanping; Kong, Xiangzhen; Peng, Zhaoliang; Zhang, Hui; Liu, Gang; Hu, Weiping; Zhou, Xiangqian

doi:10.1007/s11356-020-10024-7

Cited by 50 publications

(29 citation statements)

References 63 publications

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“…Internal sediment P loading is well studied (Janssen et al 2017; Lepori and Roberts 2017; Paytan et al 2017), and rates of sediment P release vary seasonally, with increases often observed in warm seasons (Spears et al 2012; Yang et al 2013). Sediment P release can equal or exceed external P loading in some lakes (Søndergaard et al 2013; Nürnberg and LaZerte 2016; Wu et al 2017).…”

mentioning

confidence: 99%

Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management

McCarthy

Paerl

et al. 2021

Limnology & Oceanography

125

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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 nutrient availability and limitation; thus, understanding the relative importance of external vs. internal nutrient loading is essential for developing effective mitigation strategies for CyanoHABs. We estimated long‐term nutrient budgets for Lake Taihu, China, from mass balance models using extensive monitoring of input and output nutrient data from 2005 to 2018 to quantify contributions from internal nutrient loading. The nutrient mass balance showed that 9% and 63% of annual external N and P inputs, respectively, were retained in the lake. Denitrification removed 54% of external N loading and can thus help explain rapid decreases in lake N concentrations and summer N limitation. Water column NH4+ regeneration can help sustain CyanoHABs over the short term and contributed 38–58% of potential NH4+ demand for summer‐fall, Microcystis‐dominated blooms. Internal P release contributed 23–90% of CyanoHABs P demand, although Taihu was a net P sink on an annual scale. Our results show that internal nutrient cycling helps sustain CyanoHABs in Taihu, despite reductions in external nutrient inputs. Furthermore, N is leaving the lake faster than P, thereby creating persistent N limitation. Therefore, parallel reductions in external N loading, along with P, will be most effective in reducing CyanoHABs and accelerate the recovery process in this and other large, shallow lakes.

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mentioning

confidence: 99%

Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management

McCarthy

Paerl

et al. 2021

Limnology & Oceanography

125

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“…This has led to a considerable amount of nutrients entering Chaohu Lake from the rivers [49], which first enter the western lake [50]. Such enrichment has significantly promoted TN, total phosphorus (TP) concentration and primary productivity in the overlying water in the western Chaohu Lake [51,52]. Besides this, the TP content in sediment varied from 0.400 to 0.533 mg P g −1 (with an average 0.449 mg P g −1 ) and 0.459 to 1.106 mg P g −1 (with an average 0.772 mg P g −1 ) for the ECH and WCH, respectively, showing an increasing trend from the bottom to the top for both cores (unpublished data).…”

Section: Discussionmentioning

confidence: 99%

“…Besides this, the TP content in sediment varied from 0.400 to 0.533 mg P g −1 (with an average 0.449 mg P g −1 ) and 0.459 to 1.106 mg P g −1 (with an average 0.772 mg P g −1 ) for the ECH and WCH, respectively, showing an increasing trend from the bottom to the top for both cores (unpublished data). The storage of phosphorus could be released to the overlying water [52], which can promote the primary productivity and further promote the carbon and nitrogen burial rates in the sediment.…”

Section: Discussionmentioning

confidence: 99%

Carbon and Nitrogen Burial and Response to Climate Change and Anthropogenic Disturbance in Chaohu Lake, China

Wang

Yan

et al. 2018

IJERPH

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Lakes are a crucial component of the global carbon and nitrogen cycle. As a trend of enhanced human activities and climate change, the mechanisms of burial remain poorly understood. In this study, diverse biogeochemical techniques were applied to analyze the temporal variation of organic carbon and nitrogen burial rates in Chaohu Lake. The results showed that burial rates have ranged from 9.39 to 35.87 g C m−2 yr−1 for carbon and from 1.66 to 5.67 g N m−2 yr−1 for nitrogen since the 1860s. The average rates were 19.6 g C m−2 yr−1 and 3.14 g N m−2 yr−1 after the 1970s, which were significantly higher than the rate before the 1970s, showing an increasing trend. The decrease of C/N ratios as well as organic matter δ13C values indicates that the major organic matter source in sediment has been algal production since the 1970s. The increase of δ15N values indicated that the promotion in productivity was stimulated by nutrient input from sewage and agricultural runoff. The burial rates of organic carbon and nitrogen were significantly positively related to socio-economics and temperature, indicating that Chaohu Lake will become an increasing carbon and nitrogen pool under conditions of enhanced human activities and intensive precipitation.

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“…Moreover, the amount of retained N and P tends to increase with nutrient loading (Prairie 1989, Saunders and Kalff 2001, Kõiv et al 2011, Wang et al 2020. Saunders and Kalff (2001) found that N loading is an excellent statistical predictor for the magnitude of TN retention in wetlands and lakes.…”

Section: Waterbody Characteristicsmentioning

confidence: 97%

“…and seasonal variation may partly be explained by the ecological configuration of the ecosystem in the growing season, with limited retention in oligotrophic systems with little macrophyte growth, increased retention in mesotrophic systems with strong macrophyte growth, and either high or low retention in eutrophic systems, depending on submerged macrophyte or phytoplankton dominance, respectively. Especially when biological processes are dominant, nutrient retention shows seasonal patterns along with temperature dependencies of process rates (Kadlec and Reddy 2001, de Klein and Koelmans 2011, Wang et al 2020). At higher temperatures, process rates (e.g., of denitrification) generally increase but oxygen levels tend to drop (Kadlec andReddy 2001, Jeppesen et al 2009).…”

Section: Waterbody Characteristicsmentioning

confidence: 99%

Smart Nutrient Retention Networks: a novel approach for nutrient conservation through water quality management

Wijk

Teurlincx

Brederveld³

et al. 2021

Inland Waters

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Retention of nitrogen and phosphorus in Lake Chaohu, China: implications for eutrophication management

Cited by 50 publications

References 63 publications

Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management

Contributions of external nutrient loading and internal cycling to cyanobacterial bloom dynamics in Lake Taihu, China: Implications for nutrient management

Carbon and Nitrogen Burial and Response to Climate Change and Anthropogenic Disturbance in Chaohu Lake, China

Smart Nutrient Retention Networks: a novel approach for nutrient conservation through water quality management

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