| 两种沉水植物对上覆水和间隙水中可溶性无机氮的影响 |
| 摘要点击 2495 全文点击 1247 投稿时间：2013-11-07 修订日期：2013-12-28 |
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| 中文关键词 金鱼藻 苦草 可溶性无机氮 氮形态 氮分配 扩散通量 |
| 英文关键词 Ceratophyllum demersum Vallisneria spiralis L. dissolved inorganic nitrogen(DIN) nitrogen conformation nitrogen distribution diffusion flux |
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| 中文摘要 |
| 在实验室模拟研究沉水植物金鱼藻（Ceratophyllum demersum）、苦草（Vallisneria spiralis L.）对上覆水、间隙水中可溶性无机氮（dissolved inorganic nitrogen，DIN）的浓度、赋存形态及DIN扩散通量的影响. 结果表明，金鱼藻和苦草对上覆水中 DIN的去除效果均强于间隙水，对各形态 DIN的去除差异： NO2--N>NH4+-N>NO3--N；金鱼藻对上覆水中 DIN的去除效果明显强于苦草，但对间隙水中 DIN的去除效果弱于苦草；金鱼藻和苦草减少了NH4+-N和NO2--N的扩散通量，显著增加了NO3--N的扩散通量，使NO3--N取代NH4+-N成为间隙水向上覆水中扩散DIN的主要形态，但对NO3--N和NH4+-N扩散通量的影响，金鱼藻和苦草之间差异不显著；金鱼藻和苦草增加了上覆水和间隙水中3种形态DIN含量比例的变化幅度，金鱼藻对上覆水中DIN含量比例影响强于苦草，对间隙水中DIN含量比例的影响弱于苦草. 总体来讲，金鱼藻对上覆水中DIN形态影响较大，苦草对间隙水中DIN形态影响较大，两者对DIN扩散通量的影响差别不显著. |
| 英文摘要 |
| Ceratophyllum demersum (C. demersum) and Vallisneria spiralis L. (V. spiralis L.) were studied as model submerged macrophytes. The effects of the submerged macrophytes on the forms and concentration of the dissolved inorganic nitrogen (DIN) in the overlying water and the interstitial water, as well as the diffusion flux of DIN in the water-sediment interface were investigated by batch simulation experiment. The results indicated that the removal effect of DIN in the overlying water was better than that in the interstitial water by submerged macrophytes. The removal efficiency of DIN in the overlying water and the interstitial water followed the order of NO2--N>NH4+-N>NO3--N. The removal rate of DIN by C. demersum was higher than that of V. spiralis L. in the overlying water, while the result was converse in the interstitial water. C. demersum and V. spiralis L. decreased the diffusion flux of NH4+-N and NO2--N, and increased the diffusion flux of NO3--N significantly. Consequently, NO3--N replaced NH4+-N and became the main form of DIN, which diffused from the interstitial water to the overlying water. The impact of the diffusion flux of NO3--N between C. demersum and V.spiralis L. showed no significant difference, and the result was the same for NH4+-N. C. demersum and V. spiralis L. increased the width of variation of the three nitrogen forms to total DIN in the overlying water and the interstitial water, the influence on the ratio of DIN by C. demersum was greater than that of V. spiralis L. in the overlying water, while the result was opposite in the interstitial water. In general, C. demersum had more influence in the overlying water, while V. spiralis L. had more influence in the interstitial water, and the influence of DIN diffusion flux was not significant. |
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