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滇池福保湾底泥内源氮磷营养盐释放通量估算
引用本文:李宝,丁士明,范成新,钟继承,赵斌,尹洪斌,张路.滇池福保湾底泥内源氮磷营养盐释放通量估算[J].环境科学,2008,29(1):114-120.
作者姓名:李宝  丁士明  范成新  钟继承  赵斌  尹洪斌  张路
作者单位:1. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,南京,210008;中国科学院研究生院,北京,100049
2. 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,南京,210008
3. 西安建筑科技大学,西安,710055
基金项目:国家自然科学基金 , 国家高技术研究发展计划(863计划) , 中国科学院知识创新工程项目
摘    要:在滇池福保湾采集柱状芯样,室内静态模拟沉积物NH4 -N和P3-4-P的释放.结果表明,底泥NH4 -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NH4 -N和pO3--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NH4 -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.

关 键 词:营养盐  界面  交换通量  Fick定律  Peeper  滇池
文章编号:0250-3301(2008)01-0114-07
收稿时间:1/4/2007 12:00:00 AM
修稿时间:5/8/2007 12:00:00 AM

Estimation of Releasing Fluxes of Sediment Nitrogen and Phosphorus in Fubao Bay in Dianchi Lake
LI Bao,DING Shi-ming,FAN Cheng-xin,ZHONG Ji-cheng,ZHAO Bin,YIN Hong_bin and Zhang Lu.Estimation of Releasing Fluxes of Sediment Nitrogen and Phosphorus in Fubao Bay in Dianchi Lake[J].Chinese Journal of Environmental Science,2008,29(1):114-120.
Authors:LI Bao  DING Shi-ming  FAN Cheng-xin  ZHONG Ji-cheng  ZHAO Bin  YIN Hong_bin and Zhang Lu
Institution:State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China. bli@niglas.ac.cn
Abstract:NH4(+)-N and PO4(3-)-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 NH4(+)-N and PO4(3-)-P were 22.941-163.117 mg x (m2 x d)(-1) and 0.90-2.06 mg x (m2 x 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 NH4(+)-N and PO4(3-)-P were obtained at the interstitial water-overlying water profiles. Based on calculations using the Fick's First Law,the releasing rates of sediment NH4(+)-N and PO4(3-)-P were estimated at 2.85-81.96 mg x (m2 x d)(-1) and 0.118-0.265 mg x (m2 x d)(-1), respectively. Comparison of the two methods using to estimate the fluxes of sediment NH4(+)-N and PO4(3-)-P, the NH4(+)-N and PO4(3-)-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 NH4(+)-N and PO4(3-)-P from static incubations were estimated to be (49.9 +/- 8.8) t x a(-1) and (0.79 +/- 0.53) t x a(-1), respectively.
Keywords:nutrients  interface  exchange flux  Fick's Law  Peeper  Dianchi Lake
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