五大连池水溶性有机磷矿化特性的研究

Mineralization Characteristics of Dissolved Organic Phosphorous in Wudalianchi Lake,China

通过2010年10月对五大连池采集水样,开展了水溶性有机磷(DOP)矿化速率的室内模拟实验,通过连续取样,分析了溶解性反应磷(DRP)、水溶性有机磷(DOP)、微生物数量等指标.结果表明,在矿化过程中,五大连池3个点位(W3SB:三池上游;W3XB:三池下游;W5B:五池)中,W3SB与W5B的DRP质量浓度比较接近,明显高于W3XB;DRP质量浓度均呈现出上升趋势,上升幅度由大到小依次为W5B、W3XB、W3SB,上升倍数分别为50.00、29.00和2.50倍.DOP质量浓度均呈现出一致的下降趋势,下降幅度由大到小依次为W3XB、W5B、W3SB,分别下降了85.58%、77.83%和68.00%.DOP矿化速率均表现出下降趋势,W5B的矿化速率明显高于W3SB、W3XB这2个点位,其最大矿化速率为14.10×10-4mg.(L.d)-1.微生物数量总体表现上升趋势,微生物数量与DRP质量浓度呈显著正相关(r=0.528,P<0.05),与DOP质量浓度呈显著负相关(r=-0.482,P<0.05).

The mineralization experiment of dissolved organic phosphorous was carried out in the filtered water samples collected in Wudalianchi Lake,in October,2010.The concentrations of dissolved reactive phosphorus（DRP）,dissolved organic phosphorous（DOP） and microbial number were analyzed by continuous sampling.The research showed that in the mineralization process,in the three sampling stations（W3SB,W3XB,W5B）,the DRP concentrations of W3SB and W5B were similar,and generally higher than that for W3XB,the DRP concentration showed an upward trend,increasing by 50.00 times（W5B）,29.00 times（W3XB）,2.50 times（W3SB）,respectively.The DOP concentration showed a downward trend,decreasing by 85.58%（W3XB）,77.83%（W5B） and 68.00%（W3SB）,respectively.The mineralization rate of DOP also showed a downward trend,the mineralization rate of W5B was significantly higher than that for W3SB and W3XB,the largest mineralization rate of DOP of W5B was 14.10×10-4 mg·（L·d）-1.The microbial number showed an upward trend.The positive correlation was found between the microbial number and DRP concentration（r=0.528,P0.05）,the negative correlation was found between the microbial number and DOP concentration（r=-0.482,P0.05）.