Secondary impacts of eutrophication control activities in shallow lakes: Lessons from aquatic macrophyte dynamics in Lake Taihu from 2000 to 2015

2019 ◽  
Vol 38 (4) ◽  
pp. 802-817 ◽  
Author(s):  
Yuchao Zhang ◽  
Ronghua Ma ◽  
Qichun Liang ◽  
Baohua Guan ◽  
Steven Loiselle
Keyword(s):  
Shallow Lakes ◽  
Aquatic Macrophyte ◽  
Lake Taihu ◽  
Eutrophication Control

Investigation on Nutrient Loads of Lake Taihu in China

2014 ◽  
Vol 989-994 ◽  
pp. 1286-1291 ◽  
Author(s):  
Hua Wang ◽  
Kun Xia ◽  
Bao Li ◽  
Yi Yi Zhou
Keyword(s):  
River Runoff ◽  
Laboratory Experiments ◽  
Lake Taihu ◽  
Water Environment ◽  
Temporal Distribution ◽  
Bulk Deposition ◽  
Nutrient Loads ◽  
Environment Protection ◽  
Eutrophication Control ◽  
Internal Release

Based on measured data and laboratory experiments, the spatial and temporal distribution of nutrient loads of Lake Taihu from the sources of river runoff, atmospheric bulk deposition and internal release was quantitatively analyzed. Results showed that: (1) In 2011, annual river inputs of total phosphorus (TP) and total nitrogen (TN) respectively were 2382.4 tons and 50245.0 tons, and annual river outputs of TP and TN respectively were 849.1 tons and 24236.7 tons, Huxi area was the major transverse source of nutrients as a large proportion of TP(71.6%) and TN(66.2%). (2) Annual nutrient loads of Lake Taihu were 3306.6 tons TP and 48007.0 tons TN, of which the contribution of river runoff, atmospheric bulk deposition and internal release to TP accounted for 46.3%, 38.3% and 15.4%, and that to TN accounted for 54.2%, 43.7% and 2.1%, respectively. (3) Inputs of nutrients to Lake Taihu were higher in summer (June to August), of which 983.9 tons TP and 8874.9 tons TN in June, 1420.9 tons TP and 7463.3 tons TN in July, 1347.1 tons TP and 7181.3 tons TN in August. The results have great significance for eutrophication control and water environment protection in Lake Taihu.

scholarly journals Sulfur Development in the Water-Sediment System of the Algae Accumulation Embay Area in Lake Taihu

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1817 ◽  
Author(s):  
Cheng Liu ◽  
Shiguang Shao ◽  
Lei Zhang ◽  
Yiheng Du ◽  
Kaining Chen ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Lake Taihu ◽  
Field Investigation ◽  
Acid Volatile Sulfide ◽  
Short Term ◽  
Overlying Water ◽  
Eutrophication Control ◽  
Algae Blooms ◽  
Water And Sediment ◽  
Eutrophic Shallow Lakes

Sulfur development in water-sediment systems is closely related to eutrophication and harmful algae blooms (HABs). However, the development of sulfur in water-sediment systems during heavy algae accumulation still remains unclear, especially in hyper-eutrophic shallow lakes. In this study, a quarterly field investigation was carried out for a year in the algae accumulated embay area of Lake Taihu, accompanied by a short-term laboratory experiment on algae accumulation. The results show that hydrogen sulfide and methanethiol dominated the volatile sulfur compounds (VSCs) in the water during non-accumulation seasons, whereas the concentrations of dimethyl sulfides increased during heavy algae accumulation, both in the field and the laboratory. An increase in the acid volatile sulfide (AVS) in the surface sediments was also discovered together with the increase in dimethyl sulfides. The depletion of oxygen in the overlying water and sediment–water interface during the heavy algae accumulation and decomposition was found to be closely related to both the increase in VSCs in the overlying water and increase in AVS in the sediment. The increased concentrations of these reductive sulfocompounds might aggravate the eutrophication and HABs and should be given more consideration in future eutrophication control plans for lakes.

scholarly journals Degradation Characteristics of Phosphorus in Phytoplankton-Derived Particulate Organic Matter and Its Effects on the Growth of Phosphorus-Deficient Microcystis aeruginosa in Lake Taihu

2019 ◽  
Vol 16 (12) ◽  
pp. 2155 ◽  
Author(s):  
Ming Kong ◽  
Jianying Chao ◽  
Wei Han ◽  
Chun Ye ◽  
Chun-Hua Li ◽  
...  
Keyword(s):  
Organic Matter ◽  
Microcystis Aeruginosa ◽  
Particulate Organic Matter ◽  
Lake Taihu ◽  
Degradation Mechanism ◽  
Eutrophication Control ◽  
Cyanobacteria Blooms ◽  
P Release ◽  
Early Degradation ◽  
Total P

To illustrate the contribution of phytoplankton-derived particulate organic matter (PPOM) to endogenous phosphorus (P) cycling and its effects on cyanobacteria blooms, PPOM characteristics, the degradation mechanism, and the growth of P-deficient Microcystis aeruginosa were studied in Lake Taihu. Results showed that PPOM is the most important P pool in the water column during cyanobacteria bloom, accounting for more than 80% of the total P (TP) in the water. During PPOM degradation, the particulate orthophosphate (Ortho-P) is the main species of P release from PPOM in the early degradation stage. The variations of polyphosphate (Poly-P) and phosphodiesters (Diester-P) contents were most significant, which were degraded completely within four days and eight days. Cell density and growth rate of M. aeruginosa using PPOM as P source were similar to those growing on Na2HPO4. The above results show that P in PPOM can be converted into available P by degradation, thus promoting the growth of M. aeruginosa. Therefore, the contribution of P release from PPOM degradation needs to be paid attention to in lake eutrophication control in the future.

scholarly journals Reconsideration of winds, wind waves, and turbulence in simulating wind-driven currents of shallow lakes in the Wave-current Coupled Model (WCCM) version 1.0

2021 ◽  
Author(s):  
Tingfeng Wu ◽  
Boqiang Qin ◽  
Anning Huang ◽  
Yongwei Sheng ◽  
Shunxin Feng ◽  
...  
Keyword(s):  
Drag Coefficient ◽  
Shallow Lakes ◽  
Shallow Lake ◽  
Lake Taihu ◽  
Wind Waves ◽  
Coupled Model ◽  
Field Observations ◽  
Radiation Stress ◽  
Wind Driven Currents ◽  
Wave Induced

Abstract. Winds, wind waves, and turbulence are essential variables and playing critical role in regulating a series of physical and biogeochemical processes in large shallow lakes. However, parameterizing winds, waves, currents and turbulence and simulating the interaction between them in large shallow lakes haven’t been evaluated strictly because of a lack of field observations of lake hydrodynamics process. To address this problem, two process-based field observations were conducted to record the development of summer and winter wind-driven currents in Lake Taihu, a large shallow lake in China. Based on these observations and numerical experiments, a wave-current coupled model (WCCM) is developed by rebuilding expression of wind drag coefficient, introducing wave-induced radiation stress, and adopting a simple turbulence scheme, and then used to simulate wind-driven currents in Lake Taihu. The results show that, the WCCM can accurately simulate the upwelling process resulting from the wind-driven currents during the field observations. Comparing with other model, there is a 42.9 % increase of WCCM-simulated current speed which is mainly attributed to the new expression of wind drag coefficient. Meanwhile WCCM-simulated current direction and field are also improved due to the introduction of wave-induced radiation stress. Furthermore, the use of the simple turbulent scheme in the WCCM makes the simulation of the upwelling processes more efficient. The WCCM provides a sound basis for simulating shallow lake ecosystems.

scholarly journals Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France

2020 ◽  
Author(s):  
Frédéric Labat ◽  
Gabrielle Thiébaut ◽  
Christophe Piscart
Keyword(s):  
Surface Area ◽  
Plant Communities ◽  
Shallow Lakes ◽  
Aquatic Plant ◽  
Aquatic Macrophyte ◽  
Hierarchical Cluster ◽  
Morphological Data ◽  
Macrophyte Communities ◽  
Wide Scale ◽  
First Time

Small Shallow Lakes (SSL) support exceptionally high and original biodiversity, providing numerous ecosystem services. Their small size makes them especially sensitive to anthropic activities, that causes a shift to dysfunctional turbid states and induces loss of services and biodiversity. In this study we investigated the relationships between environmental factors and macrophyte communities. Macrophytes play a crucial role in maintaining functional clear states. Better understanding factors determining the composition and richness of aquatic plant communities in least-impacted conditions may be useful to protect them. We inventoried macrophyte communities and collected chemical, climatic and morphological data from 89 least-impacted SSL widely distributed in France. SSL were sampled across four climatic ecoregions, various geologies and elevations. Hierarchical cluster analysis showed a clear separation of four macrophyte assemblages strongly associated with mineralisation. Determinant factors identified by db-RDA analysis are, in order of importance, geology, distance from source (DIS, a proxy for connectivity with river hydrosystems), surface area, climate and hydroperiod (water permanency). Surprisingly, at country-wide scale, climate and hydroperiod filter macrophyte composition weakly. Geology and DIS are the major determinants of community composition, whereas surface area determines floristic richness. DIS is identified as determinant in freshwater lentic ecosystems for the first time.

scholarly journals Principal Determinants of Aquatic Macrophyte Communities in Least-Impacted Small Shallow Lakes in France

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 609
Author(s):  
Frédéric Labat ◽  
Gabrielle Thiébaut ◽  
Christophe Piscart
Keyword(s):  
Surface Area ◽  
Shallow Lakes ◽  
Redundancy Analysis ◽  
Aquatic Plant ◽  
Aquatic Macrophyte ◽  
Hierarchical Cluster ◽  
Morphological Data ◽  
Macrophyte Communities ◽  
Wide Scale ◽  
First Time

Small shallow lakes (SSL) support exceptionally high and original biodiversity, providing numerous ecosystem services. Their small size makes them especially sensitive to anthropic activities, which cause a shift to dysfunctional turbid states and induce loss of services and biodiversity. In this study we investigated the relationships between environmental factors and macrophyte communities. Macrophytes play a crucial role in maintaining functional clear states. Better understanding the factors determining the composition and richness of aquatic plant communities in least-impacted conditions may be useful to protect these shallow lakes. We inventoried macrophyte communities and collected chemical, climatic, and morphological data from 89 least-impacted SSL widely distributed in France. SSL were sampled across four climatic ecoregions, various geologies, and elevations. Hierarchical cluster analysis showed a clear separation of four macrophyte assemblages strongly associated with mineralization. Determinant factors identified by distance-based redundancy analysis (db-RDA) analysis were, in order of importance, geology, distance from source (DIS, a proxy for connectivity with river hydrosystems), surface area, climate, and hydroperiod (water permanency). Surprisingly, at a country-wide scale, climate and hydroperiod filter macrophyte composition weakly. Geology and DIS are the major determinants of community composition, whereas surface area determines floristic richness. DIS was identified as a determinant in freshwater lentic ecosystems for the first time.

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