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- Title
增氧对粉绿狐尾藻氮素吸收及其底泥微环境的影响.
- Authors
李汉常; 张文萍; 文清柏; 谭歆; 李宗浩; 钟诚; 李炎; 易达理; 杨良玖
- Abstract
To investigate the effects of oxygenation on nitrogen uptake by Myriophyllum aquaticum and sediment microenvironment, a pot experiment was conducted using Myriophyllum aquaticum as tested material. The control group was treated without oxygenation, and four oxygenation levels of O(1 4 min), O(2 6 min), O(3 8 min), and O(4 10 min)were designed. The variation characteristics of nitrogen uptake by plants and the content of ammonium nitrogen and nitrate nitrogen in sediments under different culture periods were systematically studied. The mechanism of oxygenation regulating sediment microenvironment and improving the degradation ability of nitrogen pollutants in water by Myriophyllum aquaticum was revealed. Results showed that, with oxygenation or not, the nitrogen uptake of roots and shoots and the nitrogen accumulation of plants all increased gradually with the extension of culture time, and the nitrogen uptake of shoots was higher than that of roots. Oxygenation significantly promoted the absorption of nitrogen by Myriophyllum aquaticum. Oxygenation for 8 min in the early growth stage(t1 and t2 periods)and for 6 min in the middle and late growth stage(t3, t4, and t5 periods)corresponded to the maximum nitrogen accumulation of Myriophyllum aquaticum. The maximum nitrogen accumulation of plants in the t5 sampling periods was 171.08 mg·plant-1 with 6 min of oxygenation. Oxygenation resulted in the decrease of the sediment pH in the early growth stages and an increase in the organic matter content of the sediment in the late growth stages. Oxygenation decreased the nitrate nitrogen content in the t 2 period and the ammonium nitrogen content in the t4 and t5 periods but increased the nitrate nitrogen content of the sediment in the t5 period, thus promoting the absorption and accumulation of nitrogen by Myriophyllum aquaticum. Oxygenation affected the pH value and organic matter of sediment by increasing dissolved oxygen content in water. Thereby, the form transformation of sediment nitrogen was regulated and released to the water body, effectively improving the degradation ability of Myriophyllum aquaticum to the nitrogen pollutants in polluted water bodies.
- Subjects
DISSOLVED oxygen in water; NITROGEN content of plants; NITROGEN in water; WATER pollution; BODIES of water; AMMONIUM
- Publication
Journal of Agro-Environment Science, 2023, Vol 42, Issue 1, p155
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2022-0179