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2008年1月、5月和7月3次对象山港河鲀网箱养殖区海底沉积物进行了底质表层间隙水和上覆水营养盐(NH4-N,NO2-N,NO3-N,PO4-P)的分析,并使用Fick第一定律对该港湾沉积物——海水界面N、P营养盐的扩散通量进行了估算。研究结果表明,养殖区沉积物间隙水中N、P营养盐含量显著高于非养殖区,上覆水和沉积物间隙水中的N从1月份NH4-N为主逐渐转变到7月份以NO3-N为主。养殖区上覆水中NH4-N最高浓度为234.66μmol/L,NO3-N最高浓度为79.25μmol/L。养殖区上覆水中N、P营养盐的含量均严重超标。N、P营养盐的扩散通量估算结果显示:随着养殖高峰期的到来,沉积物—海水界面N、P营养盐的扩散方向由从沉积物向上覆水扩散逐渐转向从上覆水向沉积物扩散;养殖区扩散通量值相对于非养殖区显著扩大化;NH4-N通量变化最大,从1月份最高700.41μmol/(m2.d)降低到7月份27.87μmol/(m2.d)。海水养殖对沉积物中N、P营养盐扩散通量影响显著。
In January, May and July 2008, the sediment from the sediment in the cage culture area of Shanhaiguanhe River was subjected to surface water and overlying water nutrients (NH4-N, NO2-N, NO3-N, PO4 -P), and the Fick’s first law was used to estimate the diffusive fluxes of N and P nutrients at the seashore-seawater interface. The results showed that N and P nutrients in the interstitial water were significantly higher in the aquaculture area than in the non-aquaculture area. The N in the interstitial water of the overlying water and sediment gradually changed from NH4-N in January to July with NO3-N the Lord. The highest concentration of NH4-N in aquaculture area was 234.66μmol / L and the highest concentration of NO3-N was 79.25μmol / L. Aquaculture area overlying water N, P nutrient content were seriously exceeded. The results of diffusive fluxes of N and P nutrients showed that with the arrival of aquaculture peak, the diffusion of N and P nutrients from sediment to seawater gradually shifted from overlying water to sediment The flux of NH4-N fluxes changed the most from 700.41μmol / (m2.d) in January to 27.87μmol / (m2.d) in July. The effects of mariculture on the N and P nutrient fluxes in sediments were significant.