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

2021 ◽  
Vol 66 (4) ◽  
pp. 1492-1509
Author(s):  
Hai Xu ◽  
Mark J. McCarthy ◽  
Hans W. Paerl ◽  
Justin D. Brookes ◽  
Guangwei Zhu ◽  
...  
Keyword(s):  
Nutrient Loading ◽  
Nutrient Management ◽  
Lake Taihu ◽  
Cyanobacterial Bloom ◽  
External Nutrient ◽  
Internal Cycling

scholarly journals Effects of Cyanobacteria on Phosphorus Cycling and Other Aquatic Organisms in Simulated Eutrophic Ecosystems

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2265
Author(s):  
Peng Gu ◽  
Qi Li ◽  
Hao Zhang ◽  
Xin Luo ◽  
Weizhen Zhang ◽  
...  
Keyword(s):  
Nutrient Management ◽  
Lake Taihu ◽  
Cyanobacterial Bloom ◽  
Aquatic Organisms ◽  
Pilot Scale ◽  
Freshwater Ecosystems ◽  
Cyanobacterial Blooms ◽  
Eutrophic Lakes ◽  
P Concentration ◽  
Bloom Formation

Cyanobacterial blooms caused by eutrophication in Lake Taihu have led to ecological threats to freshwater ecosystems. A pilot scale experiment was implemented to investigate the relationship between cyanobacteria and other aquatic plants and animals in simulated eutrophic ecosystems under different phosphorus (P) regimes. The results of this study showed that cyanobacteria had two characteristics favorable for bloom formation in eutrophic ecosystems. One is the nutrient absorption. The presence of alkaline phosphatase was beneficial for algal cells in nutrition absorption under low P concentration. Cyanobacteria exhibited a stronger ability to absorb and store P compared to Vallisneria natans, which contributed to the fast growth of algal cells between 0.2 and 0.5 mg·L−1 of P (p < 0.05). However, P loads affected only the maximum biomass, but not the growth phases. The growth cycle of cyanobacteria remained unchanged and was not related to P concentration. P cycling indicated that 43.05–69.90% of the total P existed in the form of sediment, and P content of cyanobacteria showed the highest increase among the organisms. The other is the release of microcystin. Toxic microcystin-LR was released into the water, causing indirectly the growth inhibition of Carassius auratus and Bellamya quadrata and the reduction of microbial diversity. These findings are of importance in exploring the mechanism of cyanobacterial bloom formation and the nutrient management of eutrophic lakes.

scholarly journals Model-based analysis of nutrient retention and management for a lowland river

2005 ◽  
Vol 2 (6) ◽  
pp. 2549-2579 ◽  
Author(s):  
D. Kneis ◽  
R. Knoesche ◽  
A. Bronstert
Keyword(s):  
Nutrient Loading ◽  
Nutrient Management ◽  
Transport Model ◽  
Nutrient Retention ◽  
Late Summer ◽  
Phosphorus Release ◽  
Lowland River ◽  
Nutrient Inputs ◽  
Nitrogen And Phosphorus ◽  
External Nutrient

Abstract. In the context of the European Water Framework Directive options for improving the water quality of the lowland river Havel (Germany) were assessed. The lower section of this river is actually a polytrophic river-lake system suffering from high external nutrient loading and exhibiting significant in-river turnover. In order to gain a better understanding of present conditions and to allow integrated scenarios of nutrient management to be evaluated the catchment models SWIM and ArcEGMO-Urban were coupled with a simple, newly developed nutrient TRAnsport Model (TraM). Using the TraM model, the retention of nitrogen and phosphorus in a 55 km reach of the Lower Havel River was quantified and its temporal variation was analyzed. It was examined that about 30% of the external nitrogen input to the Lower Havel is retained within the surveyed river section. A comparison of simulation results generated with and without consideration of phosphorus retention/release revealed that summer TP concentrations are currently increased by 100–200% due to internal loading. Net phosphorus release rates of about 20 mg P m−2 d-1 in late summer were estimated for the Havel lakes. Scenario simulations with lowered external nutrient inputs revealed that persistent phosphorus limitation of primary production cannot be established within the next decade. It was shown that a further reduction in nitrogen concentrations requires emissions to be reduced in all inflows. Though the TraM model needs further extension it proved to be appropriate for conducting integrated catchment and river modeling.

Impact of nutrient loading on phytoplankton: a mesocosm experiment in the eutrophic Lake Taihu, China

Hydrobiologia ◽  
2018 ◽  
Vol 829 (1) ◽  
pp. 167-187 ◽  
Author(s):  
Yanqing Ding ◽  
Hai Xu ◽  
Jianming Deng ◽  
Boqiang Qin ◽  
Youwen He
Keyword(s):  
Nutrient Loading ◽  
Lake Taihu ◽  
Eutrophic Lake ◽  
Mesocosm Experiment

Identifying external nutrient reduction requirements and potential in the hypereutrophic Lake Taihu Basin, China

2018 ◽  
Vol 25 (10) ◽  
pp. 10014-10028 ◽  
Author(s):  
Jiao-Ting Peng ◽  
Xiao-Dong Zhu ◽  
Xiang Sun ◽  
Xiao-Wei Song
Keyword(s):  
Lake Taihu ◽  
Nutrient Reduction ◽  
Taihu Basin ◽  
External Nutrient

External nutrient loading from land, sea and atmosphere to all 656 Swedish coastal water bodies

2017 ◽  
Vol 114 (2) ◽  
pp. 664-670 ◽  
Author(s):  
Andreas C Bryhn ◽  
Peter H Dimberg ◽  
Lena Bergström ◽  
Ronny E Fredriksson ◽  
Johanna Mattila ◽  
...  
Keyword(s):  
Coastal Water ◽  
Nutrient Loading ◽  
Water Bodies ◽  
External Nutrient
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