Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study
Lanthanum-modified bentonite (LMB) has remarkable efficacy on eutrophication control, but the reduced bioavailable phosphorus and formed anaerobic horizon from LMB may be harmful to submerged macrophytes. We conducted this study to explore the influence of LMB on <i>Hydrilla verticillata</i...
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MDPI AG
2022-06-01
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| Online Access: | https://www.mdpi.com/2073-4441/14/11/1783 |
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| author | Yanqing Han Xiaojuan Zou Qisheng Li You Zhang Kuanyi Li |
| author_facet | Yanqing Han Xiaojuan Zou Qisheng Li You Zhang Kuanyi Li |
| author_sort | Yanqing Han |
| collection | DOAJ |
| description | Lanthanum-modified bentonite (LMB) has remarkable efficacy on eutrophication control, but the reduced bioavailable phosphorus and formed anaerobic horizon from LMB may be harmful to submerged macrophytes. We conducted this study to explore the influence of LMB on <i>Hydrilla verticillata</i> and <i>Vallisneria natans</i> in mixed-species plantings. The concentrations of TP, TDP, SRP, and TDN in the LMB treatments were lower than the Control, but the Chl <i>a</i> concentration in the HLMB treatment (850 g m<sup>−2</sup>) was higher than the Control by 63%. There were no differences of <i>V. natans</i> growth among the treatments. For <i>H. verticillata</i>, its biomass, RGR, height, branch number, root number, and length in the LLMB treatment (425 g m<sup>−2</sup>) were lower than the Control by 48%, 22%, 13%, 34%, 33%, and 8%, respectively. In addition, the biomass of <i>H. verticillata</i> was 62%, the RGR was 32%, the height was 19%, the branch number was 52%, the root length was 40%, and the root number was 54% lower in the HLMB treatment than those in the Control. In summary, LMB had negative effects on submerged macrophytes with underdeveloped roots. Submerged macrophytes with more developed roots are preferred when using combined biological–chemical methods for water restoration. |
| first_indexed | 2024-03-10T00:44:26Z |
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| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T00:44:26Z |
| publishDate | 2022-06-01 |
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| series | Water |
| spelling | doaj.art-bf62f53f41fa4d24bc9254e87433e4b82023-11-23T15:02:51ZengMDPI AGWater2073-44412022-06-011411178310.3390/w14111783Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm StudyYanqing Han0Xiaojuan Zou1Qisheng Li2You Zhang3Kuanyi Li4State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaState Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaState Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaState Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaState Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaLanthanum-modified bentonite (LMB) has remarkable efficacy on eutrophication control, but the reduced bioavailable phosphorus and formed anaerobic horizon from LMB may be harmful to submerged macrophytes. We conducted this study to explore the influence of LMB on <i>Hydrilla verticillata</i> and <i>Vallisneria natans</i> in mixed-species plantings. The concentrations of TP, TDP, SRP, and TDN in the LMB treatments were lower than the Control, but the Chl <i>a</i> concentration in the HLMB treatment (850 g m<sup>−2</sup>) was higher than the Control by 63%. There were no differences of <i>V. natans</i> growth among the treatments. For <i>H. verticillata</i>, its biomass, RGR, height, branch number, root number, and length in the LLMB treatment (425 g m<sup>−2</sup>) were lower than the Control by 48%, 22%, 13%, 34%, 33%, and 8%, respectively. In addition, the biomass of <i>H. verticillata</i> was 62%, the RGR was 32%, the height was 19%, the branch number was 52%, the root length was 40%, and the root number was 54% lower in the HLMB treatment than those in the Control. In summary, LMB had negative effects on submerged macrophytes with underdeveloped roots. Submerged macrophytes with more developed roots are preferred when using combined biological–chemical methods for water restoration.https://www.mdpi.com/2073-4441/14/11/1783subtropical lakesrestorationPhoslock<sup>®</sup><i>Hydrilla verticillata</i><i>Vallisneria natans</i>interspecific competition |
| spellingShingle | Yanqing Han Xiaojuan Zou Qisheng Li You Zhang Kuanyi Li Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study Water subtropical lakes restoration Phoslock<sup>®</sup> <i>Hydrilla verticillata</i> <i>Vallisneria natans</i> interspecific competition |
| title | Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study |
| title_full | Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study |
| title_fullStr | Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study |
| title_full_unstemmed | Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study |
| title_short | Responses of Different Submerged Macrophytes to the Application of Lanthanum-Modified Bentonite (LMB): A Mesocosm Study |
| title_sort | responses of different submerged macrophytes to the application of lanthanum modified bentonite lmb a mesocosm study |
| topic | subtropical lakes restoration Phoslock<sup>®</sup> <i>Hydrilla verticillata</i> <i>Vallisneria natans</i> interspecific competition |
| url | https://www.mdpi.com/2073-4441/14/11/1783 |
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