| 潘桂娟,刘雯.盐度对木本植物净化海水养殖污水的影响[J].广东农业科学,2023,(6-7):- |
| Effect of Salinity on Purification of Mariculture Wastewater by Woody Plants |
| 投稿时间：2023-03-19 修订日期：2023-06-01 |
| DOI： |
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| 摘要点击次数: 186 |
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| Abstract: |
| A hydroponic pot experiment was conducted to study the effects of different salt concentrations ( 0‰, 2.5‰, 5‰, 7.5‰, 10‰, 15‰, 20‰ ) on the purification of mariculture wastewater by Terminalia microphylla and Buxus sinica. The results showed that : ( 1 ) The removal rate of TN and TP decreased with the increase of salinity, and the removal rate of COD fluctuated with the increase of salinity. ( 2 ) Under different salinity conditions, the two plants had different effects on the absorption and removal of nitrogen and phosphorus. The accumulation of nitrogen showed the rule of underground > aboveground. The accumulation of phosphorus in the leaves of T.microphylla showed underground > aboveground at low salinity. The accumulation of nitrogen and phosphorus in Terminalia microphylla was higher than that in Buxus sinica. When the salinity was 0‰, 2.5‰, 5‰, 7.5‰, 10‰, 15‰, 20‰, the amount of nitrogen and phosphorus absorbed by the leaves were 1.83 mg/g, 2.01 mg/g, 1.78 mg/g, 1.91 mg/g, 1.95 mg/g, 1.35 mg/g and 1.68 mg/g, respectively. With the increase of salinity, the accumulation of K+ fluctuated greatly, while the accumulation of Na+ showed an increasing trend. When the salinity > 2.5 ‰, the accumulation of Na+ showed the rule of aboveground > underground, and the increase of Na+ accumulation reduced the ability of plants to remove nitrogen and phosphorus. ( 3 ) pH, ORP, DO and other environmental factors have a certain effect on the removal of pollutants from water and the absorption of nitrogen, phosphorus, K+ and Na+ by plants. |
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