Effects of Harvesting Intensity on the Growth of Hydrilla verticillata and Water Quality

The effects of harvesting intensity on the growth of Hydrilla verticillata (L. fil.) Royle as well as water quality were studied in controlled experiments to provide a reference for managing submerged vegetation and purifying the water. The results showed that harvesting had a significant effect on...

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Bibliographic Details
Published in:Sustainability 2022-11, Vol.14 (22), p.15390
Main Authors: Zhu, Shunmei, Wu, Xiaodong, Zhou, Mengdie, Ge, Xuguang, Yang, Xingqiang, Wang, Nuoxi, Lin, Xiaowen, Li, Zhenguo
Format: Article
Language:English
Subjects:
Aquatic plants
Biomass
Environmental restoration
Hydrilla verticillata
Lakes
Nitrogen
Phosphorus
Phytoplankton
Recovery time
Research methodology
Submerged plants
Sustainability
Variance analysis
Water purification
Water quality
Water quality control
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Summary:The effects of harvesting intensity on the growth of Hydrilla verticillata (L. fil.) Royle as well as water quality were studied in controlled experiments to provide a reference for managing submerged vegetation and purifying the water. The results showed that harvesting had a significant effect on the recovery of shoot growth and H. verticillata height. The harvested group recovered completely or mostly after two harvests, but the recovery time was significantly longer than the control group. The final biomasses of the harvested groups (15%, 30%, 45%, 60%, and 75% harvested) decreased to 66.61%, 49.13%, 43.95%, 43.77%, and 29.94% of the control group, respectively. The greater the harvesting intensity, the fewer the winter buds. Harvesting reduced the number of H. verticillata branches. Repeated harvesting at medium and low intensities during the rapid growth of H. verticillata effectively improved the water quality and inhibited the propagation and growth of phytoplankton. These results show that harvesting controlled the growth of H. verticillata, and that medium and low harvesting intensities were best when considering water quality.
ISSN:2071-1050
2071-1050
DOI:10.3390/su142215390