Institute for Eco-environmental Sciences, Wenzhou Vocational College of Science & Technology, Wenzhou, China.
Int J Phytoremediation. 2013;15(6):522-35. doi: 10.1080/15226514.2012.716103.
Seasonal variations and aeration effects on water quality improvements and the physiological responses of Nymphaea tetragona Georgi were investigated with mesocosm experiments. Plants were hydroponically cultivated in six purifying tanks (aerated, non-aerated) and the characteristics of the plants were measured. Water quality improvements in purifying tanks were evaluated by comparing to the control tanks. The results showed that continuous aeration affected the plant morphology and physiology. The lengths of the roots, petioles and leaf limbs in aeration conditions were shorter than in non-aeration conditions. Chlorophyll and soluble protein contents of the leaf limbs in aerated tanks decreased, while peroxidase and catalase activities of roots tissues increased. In spring and summer, effects of aeration on the plants were less than in autumn. Total nitrogen (TN) and ammonia nitrogen (NH4(+)-N) in aerated tanks were lower than in non-aerated tanks, while total phosphorus (TP) and dissolved phosphorus (DP) increased in spring and summer. In autumn, effects of aeration on the plants became more significant. TN, NH4(+)-N, TP and DP became higher in aerated tanks than in non-aerated tanks in autumn. This work provided evidences for regulating aeration techniques based on seasonal variations of the plant physiology in restoring polluted stagnant water.
采用中试实验研究了季节性变化和曝气对水质改善及睡莲（Nymphaea tetragona Georgi）生理响应的影响。将植物在六个净化罐中（曝气、非曝气）进行水培，并测量植物的特性。通过与对照罐进行比较，评估净化罐中的水质改善情况。结果表明，连续曝气会影响植物形态和生理。曝气条件下的根、叶柄和叶片肢的长度比非曝气条件下的短。充气罐中叶片肢的叶绿素和可溶性蛋白质含量降低，而根部组织的过氧化物酶和过氧化氢酶活性增加。在春季和夏季，曝气对植物的影响小于秋季。曝气罐中的总氮（TN）和氨氮（NH4（+）-N）低于非曝气罐，而在春季和夏季，总磷（TP）和溶解磷（DP）增加。在秋季，曝气对植物的影响变得更加显著。在秋季，曝气罐中的 TN、NH4（+）-N、TP 和 DP 均高于非曝气罐。本研究为根据植物生理季节性变化调节曝气技术以恢复污染静水提供了依据。
