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作 者 ：吴晓霞,范长禄,凌 辉,陈丁立,金银根*

期 刊 ：西北植物学报 2013年 4期 页码：787~791

关键词：伊乐藻；营养盐；生长状态；净化效果；

Keywords:Elodea canadensis, nutrient salt, growing status, clean-up effect,

摘 要 ：利用室内静态模拟生长体系,研究了沉水植物伊乐藻在夏季高温季节5种不同氮磷营养条件水体中的生长状况及其对水体中氮、磷的净化效果。结果表明:低氮（1.0～5.5 mg·L^-1）、低磷（0.3～1.3 mg·L^-1）营养盐水体中的伊乐藻生长状态良好,但在高浓度氮(8.0 mg·L^-1)、磷(2.0 mg·L^-1) 营养盐条件下,伊乐藻生长在后期受到部分抑制。伊乐藻对水体氮磷的去除效果随水体氮磷浓度的增加而增强,与起始水体氮磷含量相比,不同营养盐条件处理50 d时,各处理伊乐藻对水体总氮的去除率分别达到55.88%、85.51%、88.18%、93.57%、95.97%,总磷的去除率分别达到47.55%、74.31%、57.75%、79.23%、74.92%。可见,伊乐藻在夏季高温季节对水体氮磷有一定去除效果,且对氮的去除效率高于磷,其对高氮、高磷环境有一定的耐受能力。

Abstract:Elodea canadensis was grown in water with constant gradients of total nitrogen (TN) and phosphorous (TP) concentrations.In present study,the growth status of E.canadensis and the capacity of removing phosphorus and nitrogen in greenhouse were evaluated by hydrotropic experiments of summer season.The results showed that E.canadensis could growth well under lower nutrient concentration (TN 1.0～5.5 mg·L^-1,TP 0.3～1.3 mg·L^-1）while its growth were partial inhibited under the enriched nutrient concentration (TN=8.0 mg·L^-1,TP=2.0 mg·L^-1 ).The nutrients removal rates of E.canadensis were enhanced with the increase of the nutrient concentrations.After 50 days treatment,the removal rate of nitrogen by E.canadensis were 55.88%,85.51%,88.18%,93.57%,95.97%,respectively and phosphorus were 47.55%,74.31%,57.75%,79.23%,74.92%,respectively.Based on our results,we can conclude that E.canadensis shown removal effects of phosphorus and nitrogen in the hot weather during summer with tolerance to higher concentration of nitrogen and phosphorus to some extent.The removal efficiency of E.canadensis is higher for nitrogen than that for phosphorus.

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