Effect of planting density of <i>Vallisneria natans</i> on in-situ ecological restoration of black and odorous water bodies and sediments

JI Yunlong; LIU Guohong; QIU Ye; LI Jiannan; TIAN Yan; FENG Yujie

doi:10.13205/j.hjgc.202510012

Volume 43 Issue 10

Oct. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(10): 103-111

JI Yunlong, LIU Guohong, QIU Ye, LI Jiannan, TIAN Yan, FENG Yujie. Effect of planting density of Vallisneria natans on in-situ ecological restoration of black and odorous water bodies and sediments[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(10): 103-111. doi: 10.13205/j.hjgc.202510012

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JI Yunlong, LIU Guohong, QIU Ye, LI Jiannan, TIAN Yan, FENG Yujie. Effect of planting density of Vallisneria natans on in-situ ecological restoration of black and odorous water bodies and sediments[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(10): 103-111. doi: 10.13205/j.hjgc.202510012

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Effect of planting density of Vallisneria natans on in-situ ecological restoration of black and odorous water bodies and sediments

doi: 10.13205/j.hjgc.202510012

1. State Key Laboratory of Urban-rural Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China;
2. College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China;
3. Heilongjiang Building Materials Industry Planning and Design Research Institute, Harbin 150028, China

Received Date: 2025-05-07
Accepted Date: 2025-06-25
Rev Recd Date: 2025-06-14

Available Online: 2025-12-03

Publish Date: 2025-10-01

Abstract

Abstract

Black and odorous water severely threatens the survival of aquatic organisms and human health， necessitating urgent remediation measures. In this paper， in-situ restoration of black and odorous water bodies was achieved by planting submerged plants， Vallisneria natans. Experimental results demonstrated that the optimal initial planting density was 150 plants/m² by investigating the COD， nitrogen， phosphorus in water， and TC， TN and other indicators in sediment. Compared to the control system， the removal rates of COD， ammonia nitrogen （NHNH₄⁺-N）， nitrate （NO₃^--N）， total nitrogen （TN）， and total phosphorus （TP） were 1.08， 1.25， 1.71， 1.45， and 1.62 times higher， respectively. Additionally， Vallisneria natans sensibly enhanced dissolved oxygen （DO） levels in the water. The system with a planting density of 150 plants/m² exhibited the most significant inhibitory effect on the accumulation of TC and TN in the sediment， with the minimal content increase rates of 10.5% and 3.6%， respectively. The oxidation-reduction potential （ORP） of surface sediment increased by 40.4%， confirming the efficacy of Vallisneria natans in removing pollutants and ameliorating anaerobic conditions in black and odorous sediment. Among the 150 plants/m² system， the growth rates of fresh weight， leaf number， and the average number of ramets were 106.25%， 61.11%， and 11.40 plants， respectively， all of which were higher than those in other systems. Under this initial planting density， it was more conducive to Vallisneria natans resisting extreme environments and proliferating rapidly. This study can provide theoretical reference to the application of Vallisneria natans for in-situ restoration of black and odorous water and sediment.
- submerged plant,
- planting density,
- black and odorous water body,
- sediment,
- in-situ restoration

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References(40)

References

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