| 蓝藻水华聚集对水葫芦生理生态的影响 |
| 摘要点击 2884 全文点击 1118 投稿时间：2014-05-26 修订日期：2014-07-31 |
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| 中文关键词 蓝藻水华 漂浮植物 水葫芦 营养盐 植物生理 |
| 英文关键词 cyanobacterial blooms floating plants water hyacinth nutrients plant physiology |
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| 中文摘要 |
| 蓝藻水华聚集后常会引起水体溶氧(DO)下降、水体环境恶化,从而对水生植物的生长产生影响. 采用模拟实验,研究了在不超过25℃、5种不同浓度蓝藻聚集后,对水葫芦生长的影响及其生理响应变化,以期为减轻蓝藻聚集对植物不良影响和提高水体净化效果提供理论依据. 结果表明,蓝藻聚集浓度低于 60 g·L-1的处理中,随着蓝藻浓度的增加,水体的 DO、pH下降, ORP值降低到 100 mV左右, TN降低了 58%~78%、TP降低了 43%~68%、COD降低了 59%~73%,植物叶片可溶性蛋白、可溶性糖、MDA含量增加; 并且蓝藻浓度越高, MDA含量越高. 在不同蓝藻浓度处理中,在低于 60 g·L-1的蓝藻聚集下,水葫芦仍可以生长; 超过 60 g·L-1的处理中, DO、ORP大幅度降低,水体出现缺氧乃至厌氧状态,植物叶片中可溶性糖的含量随着实验的进行表现为先增加、后减小的变化趋势,表明随着蓝藻浓度的增加,水葫芦对水体中氮磷的吸收能力降低, 蓝藻聚集将对其产生不可逆的胁迫. 各处理中植物的根长、总长、鲜重与实验刚开始相比,都呈现增加的趋势,根长增加 0.29~2.44倍,总长增加 0.41~0.76倍,鲜重增加 0.9~1.43倍,并且随蓝藻浓度的增加,根长、总长增加的幅度减小. 因此在利用漂浮植物水体净化中,将避免蓝藻的严重聚集,从而更好地发挥其水体净化功能. |
| 英文摘要 |
| Blue-green algae bloom will consume plenty of dissolved oxygen in water, which affects the growth of aquatic plants. The effects of water hyacinth growth and physiological response changes under 25℃, 5 different concentrations of cyanobacteria gathered were studied and which would provide a theoretical basis to mitigate adverse impacts and improve water purification effect. The results showed that water quality indexes including dissolved oxygen (DO),pH dropped in algae density below 60 g·L-1, with the increase of algae density. And the level of oxidation-reduction potential dropped to about 100mV. The removal rates of TN, TP and COD were 58% -78%, 43%-68% and 59%-73%,leaf soluble protein, soluble sugar, MDA contents increased, respectively; and the MDA content became higher with the increase of algae density. It indicated that the water hyacinth could adapt to the adversity condition as algae density less than 60 g·L-1. While algae density above 60 g·L-1, water quality indexes significantly decreased, respectively and the water was in hypoxia or anoxia conditions. Plant leaves soluble sugar contents had a change trend of low-high-low. It indicated that the removal rates of TN, TP decreased with the increase of algae density and water hyacinth had irreversible stress. Plant root length, total length, fresh weight in different treatments, increased compared with the beginning of the experiment, the increase of root length, total length and fresh weight were 0.29-2.44 times, 0.41-0.76 times and 0.9-1.43 times. The increase of root length, total length decreased with the increase of algae density. According to the results, the cyanobacteria should avoid of excessive accumulation as using the floating plant to purify the water. |
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