| 滇池福保湾底泥内源氮磷营养盐释放通量估算 |
| 摘要点击 5159 全文点击 2468 投稿时间：2007-01-04 修订日期：2007-05-08 |
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| 中文关键词 营养盐 界面 交换通量 Fick定律 Peeper 滇池 |
| 英文关键词 nutrients interface exchange flux Fick's Law Peeper Dianchi Lake |
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| 中文摘要 |
| 在滇池福保湾采集柱状芯样，室内静态模拟沉积物NH+4-N和PO3-4-P的释放.结果表明，底泥NH+4-N和PO3-4-P的释放速率分别为22.941～163.117 mg·(m2·d)-1和0.90～2.06 mg·(m2·d)-1，不同区域释放速率差异极大.相对较低的释放速率与湖湾接纳高浓度污水使上覆水与沉积物孔隙水间浓度势减弱有关.通过Peeper(原位渗析膜采样器)法获取间隙水-上覆水剖面样品分析，并根据Fick扩散定律计算出福保湾底泥NH+4-N和PO3-4-P的释放速率分别为2.85～81.96 mg·(m2·d)-1和0.118～0.265 mg·(m2·d)-1.比较２种方法，利用Fick定律计算出的界面氮磷释放通量明显小于柱样模拟方法.经面积加权，按静态释放计算出福保湾底泥NH+4-N和PO3-4-P的年释放通量分别为(49.9±8.8) t和（0.79±0.53）t. |
| 英文摘要 |
| NH+4-N and PO3-4-P release from the sediment of Fubao Bay in Dianchi Lake were simulated using static incubations of intact sediment cores. The results showed that the releasing rates of sediment NH+4-N and PO3-4-P were 22.941～163.117 mg·(m2·d)-1 and 0.90～2.06 mg·(m2·d)-1，respectively，with large variation in different sampling areas. The lower releasing rates were associated with declined concentration gradients between sediment pore water and overlying water，which might be related to the high input of sewages in the bay. Using peeper (in situ dialysis membrane samplers) method, concentration gradients of NH+4-N and PO3-4-P were obtained at the interstitial water-overlying water profiles. Based on calculations using the Fick's First Law，the releasing rates of sediment NH+4-N and PO3-4-P were estimated at 2.85～81.96 mg·(m2·d)-1 and 0.118～0.265 mg·(m2·d)-1，respectively. Comparison of the two methods using to estimate the fluxes of sediment NH+4-N and PO3-4-P，the NH+4-N and PO3-4-P flux from the calculation using Fick's Ｆirst Law was lower than that using static incubations. For the whole bay，the area-weighted releasing fluxes of NH+4-N and PO3-4-P from static incubations were estimated to be (49.9±8.8) t·a-1 and (0.79±0.53) t·a-1，respectively. |
