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

Shunmei Zhu, Xiaodong Wu (), Mengdie Zhou, Xuguang Ge, Xingqiang Yang, Nuoxi Wang, Xiaowen Lin and Zhenguo Li
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Shunmei Zhu: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Xiaodong Wu: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Mengdie Zhou: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Xuguang Ge: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Xingqiang Yang: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Nuoxi Wang: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Xiaowen Lin: College of Urban and Environmental Sciences, Hubei Normal University, Huangshi 435002, China
Zhenguo Li: School of Earth Sciences and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan 411201, China

Sustainability, 2022, vol. 14, issue 22, 1-21

Abstract: 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.

Keywords: H. verticillata; harvesting; growth; water quality (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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