Determining the Optimal Biomass of Macrophytes during the Ecological Restoration Process of Eutrophic Shallow Lakes

Hu, Wen; Wei, Weiwei; Ye, Chun; Li, Chunhua; Zheng, Ye; Shi, Xiaogang; Chang, Manqi; Chen, Hongsen

doi:10.3390/w13213142

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…However, in the A 1 B 1 , A 1 B 2 , and A 1 B 3 ratios, the species interaction further intensified, without a commensurate increase in the purification effect. This indicates that excessive biomass does not augment the purification effect any further, consistent with the findings of Hu et al [ 37 ]. Their research on the optimal biomass of aquatic plants for lake ecological restoration highlighted that maintaining a biomass of 5.5 kg·m −2 is crucial, as an excessively high biomass fails to continue promoting the restoration process.…”

Section: Discussionsupporting

confidence: 91%

Purification Effect of Water Eutrophication Using the Mosaic System of Submerged–Emerged Plants and Growth Response

Chang,

Xu,

Zhang

et al. 2024

Plants

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Aquatic plants play a crucial role in the sustainable management of eutrophic water bodies, serving as a valuable tool for water purification. However, the effectiveness of using aquatic plants for improving water quality is influenced by landscape considerations. In practical applications, challenges arise concerning low purification efficiency and compromised aesthetic appeal when utilizing plants for water purification. To address these issues, this study aimed to examine the impact of aquatic plants on the purification of simulated landscape water bodies, specifically focusing on the effectiveness of the mosaic system of submerged–emerged plants in remediating eutrophic water bodies. Our findings indicated that individual aquatic plants exhibited limited efficacy in pollutant (total nitrogen, total phosphorus, ammonia nitrogen, and chemical oxygen demand) removal. However, when combined in appropriate proportions, submerged plants could enhance species growth and improve the purification efficiency of polluted water bodies. Notably, the mosaic system of submerged–emerged plants neither significantly promoted nor inhibited the growth of each other, but it effectively removed pollutants from the simulated water bodies and inhibited turbidity increase. The comprehensive evaluation ranked the purification capacity as Canna indica-submerged plants combination (C + S) > Thalia dealbata-submerged plants combination (T + S) > Iris pseudacorus-submerged plants combination (I + S) > Lythrum salicaria-submerged plants combination (L + S). Both C + S and T + S configurations effectively mitigated the rise of water turbidity and offered appealing landscape benefits, making them viable options for practical applications in urban landscape water bodies. Our study highlights that a submerged–emerged mosaic combination is a means of water purification that combines landscape aesthetics and purification efficiency.

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Section: Discussionsupporting

confidence: 91%

Purification Effect of Water Eutrophication Using the Mosaic System of Submerged–Emerged Plants and Growth Response

Chang,

Xu,

Zhang

et al. 2024

Plants

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“…from farmlands of its watershed are connected to surrounding rivers and eventually flow into Lake Datong. The elevation of Lake Datong is lower than that of the surrounding areas, such that the lake area is thus a "sink" of non-point-source pollution [23].…”

Section: Study Areamentioning

confidence: 99%

Effects of aquaculture on the shallow lake aquatic ecological environment of Lake Datong, China

et al. 2022

Environ Sci Eur

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Background The restoration of lake ecosystems requires a good knowledge of the lake’s history and the driving mechanism of environmental changes. In this study, we used Lake Datong, the largest inland lake in Hunan Province China, as an example to study the effects of aquaculture, based on historical data of aquatic creature, diatom inferred-total phosphorous (DI-TP) data, and an Ecopath model. Lake Datong has undergone several stages of aquaculture from 1980, with a rapid increase in fish production and fish feed supplementation at each stage. Its water quality has deteriorated since the introduction of aquaculture and the lake has become moderate eutrophic status. Results According to the DI-TP data, before 1930, Lake Datong was in a mesotrophic status (50–60 μg/L DI-TP). Between 1930 and 1980, the number of nutrient-tolerant species increased slightly, which indicates a nutrient increase in the lake (66–83 μg/L DI-TP). From the 1980s to 2010 and especially since 2000, eutrophication increased rapidly, with eutrophic species dominating the diatom assemblage, such as Stephanodiscus hantzschii, S. minutulus, and a sudden decrease in Aulacoseira granulata (< 10%). The annual average DI-TP concentration was 202 μg/L. After 2010, DI-TP decreased to 127–152 μg/L. In 2019, consumer biomass in Lake Datong was very low because the large-scale aquaculture was restricted by local government. The biomass of submerged macrophytes was relatively high, indicating that excessive primary producers had not been used by consumers and therefore, had not entered the food web. This led to a reduction in the energy transfer efficiency (TE) of the ecosystem. Conclusions The succession of the water ecosystem of Lake Datong is reappeared by DI-TP analysis and historical reference data. Lake Datong has experienced four stages of eutrophication succession following the introduction of aquaculture activities, with dramatic changes in the composition and biomass of its aquatic creatures. After comprehensive management in 2017, the consumer biomass of Lake Datong was at a relatively lower level, and the biomass of submerged macrophytes was higher, meaning a large quantity of primary producers had not been used by consumers, thus had not entered the food web, which consequently reduces the energy TE of the ecosystem. Future management needs to pay attention to making a suitable macrophyte harvest plan, stocking herbivorous and omnivorous fish, and establishing rational fishing, which can not only enhance the energy flows and nutrient cycling of the ecosystem, but also improve the food web structure. Our results provide important reference values and theoretical support for decision-makers and stakeholders in the subsequent management of similar shallow lake-water ecosystems.

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Spatial distribution of nutrient loads and thresholds in large shallow lakes: The case of Chaohu Lake, China

Zhen

Yu²,

Yi³

2022

Journal of Hydrology

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Determining the Optimal Biomass of Macrophytes during the Ecological Restoration Process of Eutrophic Shallow Lakes

Cited by 3 publications

References 35 publications

Purification Effect of Water Eutrophication Using the Mosaic System of Submerged–Emerged Plants and Growth Response

Purification Effect of Water Eutrophication Using the Mosaic System of Submerged–Emerged Plants and Growth Response

Effects of aquaculture on the shallow lake aquatic ecological environment of Lake Datong, China

Spatial distribution of nutrient loads and thresholds in large shallow lakes: The case of Chaohu Lake, China

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