Effects of water regime on the growth of the submerged macrophyte <i>Ceratophyllum demersum</i> at different densities

Liu, Lin; Guan, Yu-Ting; Qin, Tian-Jian; Wang, Yong‐Yang; Liu, Hongli; Zhi, Yingbiao

doi:10.1080/02705060.2017.1422043

Cited by 13 publications

(4 citation statements)

References 62 publications

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“…In combination with the coverage of submerged plants, the average coverage of submerged plants in the river replenished by natural water was 78%, while that in the rivers replenished by reclaimed water was 43%, indicating that more submerged plant coverage would have a positive ecological effect on the improvement of water ecological health. Liu et al [35] considered that in a certain range, the higher the biomass or coverage of submerged plants, the better the purification effect of nitrogen and phosphorus nutrients in eutrophic water. In this study, the ecological environment quality of the river segments with higher submerged plant coverage was better, which was consistent with the results of previous studies.…”

Section: Comparative Evaluation Of the Restoration Effect Of Submerge...mentioning

confidence: 99%

Evaluation of Restoration Effect of Submerged Plant Community in Urban Rivers Replenished by Reclaimed Water

Xu,

Wang,

Wang

et al. 2023

Sustainability

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Submerged plant community construction is extensively used in the field of urban river ecological restoration, but it is sometimes difficult to establish a large area of survival or a stable community after restoration. Therefore, there is some uncertainty in determining the restoration effect. To verify the restoration effect of urban rivers replenished by reclaimed water through the application of a submerged plant community, this paper takes the typical urban rivers with reclaimed water in Beijing, the Liangshui River and the Dalong River, as the research objects and takes the Yongding River, a river replenished by natural water, as the comparison to establish a water eco-environment quality index and carry out the restoration effect evaluation of a submerged plant community based on field monitoring. In a comparison of the water eco-environment quality index of rivers and the coverage of submerged plants, the evaluation results indicate that the Yongding River and Liangshui River have the same number of submerged plant species, yet their plant coverage is different. The ecological environment quality condition of the Yongding River is superior to that of the Liangshui River and the Dalong River. The ecological environment quality of the reclaimed water river segment with an average coverage of submerged plants greater than or equal to 50% is relatively better, with relatively more sensitive species. This suggests that for rivers replenished by reclaimed water, the construction of submerged plant communities will improve the water ecological conditions on the premise of ensuring a certain degree of submerged plant species and coverage. By calculating the correlation coefficients relating to the coverage of submerged plants by 32 environmental factors including the indicators of water quality, hydrology and sediment, the paper initially screens out water depth, ammonia nitrogen, nitrite nitrogen, BOD, permanganate index, and total nitrogen and organic carbon in the sediment as the major environmental factors affecting the coverage status of submerged plants. It can provide a reference for the control of environmental factors in the construction and maintenance of submerged plants to guarantee a restoration effect in the future.

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Section: Comparative Evaluation Of the Restoration Effect Of Submerge...mentioning

confidence: 99%

Evaluation of Restoration Effect of Submerged Plant Community in Urban Rivers Replenished by Reclaimed Water

Xu,

Wang,

Wang

et al. 2023

Sustainability

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“…As submerged macrophytes are usually exposed to relatively weak light, even moderate light in terrestrial areas may be a stress source for them. Therefore, the water depth, which is strongly correlated with the incident light intensity, is an important factor for the growth of macrophytes ( Liu et al, 2018 ; Asaeda et al, 2020 ). Further, plants—including submerged macrophytes—have a defense capacity against stress, depending on their physiological status.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Peroxide Variation Patterns as Abiotic Stress Responses of Egeria densa

et al. 2022

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In vegetation management, understanding the condition of submerged plants is usually based on long-term growth monitoring. Reactive oxygen species (ROS) accumulate in organelles under environmental stress and are highly likely to be indicators of a plant’s condition. However, this depends on the period of exposure to environmental stress, as environmental conditions are always changing in nature. Hydrogen peroxide (H2O2) is the most common ROS in organelles. The responses of submerged macrophytes, Egeria densa, to high light and iron (Fe) stressors were investigated by both laboratory experiments and natural river observation. Plants were incubated with combinations of 30–200 μmol m–2 s–1 of photosynthetically active radiation (PAR) intensity and 0–10 mg L–1 Fe concentration in the media. We have measured H2O2, photosynthetic pigment concentrations, chlorophyll a (Chl-a), chlorophyll b (Chl-b), carotenoid (CAR), Indole-3-acetic acid (IAA) concentrations of leaf tissues, the antioxidant activity of catalase (CAT), ascorbic peroxidase (APX), peroxidase (POD), the maximal quantum yield of PSII (Fv Fm–1), and the shoot growth rate (SGR). The H2O2 concentration gradually increased with Fe concentration in the media, except at very low concentrations and at an increased PAR intensity. However, with extremely high PAR or Fe concentrations, first the chlorophyll contents and then the H2O2 concentration prominently declined, followed by SGR, the maximal quantum yield of PSII (Fv Fm–1), and antioxidant activities. With an increasing Fe concentration in the substrate, the CAT and APX antioxidant levels decreased, which led to an increase in H2O2 accumulation in the plant tissues. Moreover, increased POD activity was proportionate to H2O2 accumulation, suggesting the low-Fe independent nature of POD. Diurnally, H2O2 concentration varies following the PAR variation. However, the CAT and APX antioxidant activities were delayed, which increased the H2O2 concentration level in the afternoon compared with the level in morning for the same PAR intensities. Similar trends were also obtained for the natural river samples where relatively low light intensity was preferable for growth. Together with our previous findings on macrophyte stress responses, these results indicate that H2O2 concentration is a good indicator of environmental stressors and could be used instead of long-term growth monitoring in macrophyte management.

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“…Water level has been proven in numerous studies to have a major impact on submerged macrophytes and floating-leaved plants [10,11], and WLF has direct or indirect effects on the growth and physiological characteristics of submerged macrophytes. For instance, scholars explored the response of plant height, fresh weight, root length, and enzyme activity of submerged macrophytes to WLF [10,12,13]. However, previous studies were mainly focus on small-scale water level simulation experiments, and very few experimental studies have examined the effect of WLF on the community structure of submerged macrophytes on a large scale, especially the effect of WLF on the community structure of specific submerged macrophytes in plateau lakes.…”

Section: Introductionmentioning

confidence: 99%

Effects of Water Level Fluctuations on the Growth Characteristics and Community Succession of Submerged Macrophytes: A Case Study of Yilong Lake, China

Zhao

Fang

Zhao

et al. 2021

Water

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Water level fluctuation (WLF) has a significant effect on aquatic macrophytes, but few experimental studies have examined the effect of WLF on submerged community succession, especially from a large-scale perspective. In this study, field monitoring of WLF and submerged macrophytes was conducted in Yilong Lake (SE China) over two years, and the impacts of WLF on the growth characteristics and the community structure of submerged macrophytes were determined. The results show that the biomass of submerged macrophytes decreased significantly after the water level increased and submerged macrophytes could cope with the adverse environment by adjusting their growth posture, for example, increasing plant length and reducing branch number. However, different submerged plants have different regulatory abilities, which leads to a change in the community structure. Myriophyllum spicatum, Stuckenia pectinata, and Najas marina had better adaptation abilities to WLF than Najas minor and Utricularia vulgaris. Changes in water depth, dissolved oxygen, and transparency significantly contribute to the effect of WLF on submerged plant communities. Therefore, when determining the range of WLF, the above three critical factors and submerged plant species should be considered. WLF changed the spatial distribution of the aquatic plant community. When water levels rose, the density of the submerged macrophyte community in the original growth region reduced as the emergent plants migrated to shallower water, and the seed bank germination was aided by transparent water produced among emergent plants. This can be used as a pioneering measure to restore submerged plants in eutrophic lakes with low transparency. In addition, a suitable water depth created by WLF was conducive to activating the seed bank and improving the diversity of aquatic plants. Finally, a distribution map of aquatic plants in Yilong Lake is drawn.

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Effects of water regime on the growth of the submerged macrophyte Ceratophyllum demersum at different densities

Cited by 13 publications

References 62 publications

Evaluation of Restoration Effect of Submerged Plant Community in Urban Rivers Replenished by Reclaimed Water

Evaluation of Restoration Effect of Submerged Plant Community in Urban Rivers Replenished by Reclaimed Water

Hydrogen Peroxide Variation Patterns as Abiotic Stress Responses of Egeria densa

Effects of Water Level Fluctuations on the Growth Characteristics and Community Succession of Submerged Macrophytes: A Case Study of Yilong Lake, China

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