白洋淀水体和沉积物中碱性磷酸酶活性的时空分布及其影响因素

2011—2012年期间，以白洋淀8个国控监测点为采样点，通过对水体和沉积物碱性磷酸酶活性（APA）和理化参数的分析，揭示了白洋淀碱性磷酸酶活性时空分布特征及影响因素.结果表明，白洋淀碱性磷酸酶活性具有明显的时空分布规律，春季碱性磷酸酶活性增大，夏秋季达最高值，冬季最低，富营养化程度高的样点碱性磷酸酶活性较高.相关性分析结果表明，水体碱性磷酸酶活性与氨氮和氮磷比显著负相关（p<0.05），与温度、总磷、浮游植物密度显著正相关（p<0.01）.推测浮游植物密度可能是影响水体碱性磷酸酶活性的主要因素；沉积物中碱性磷酸酶活性可能主要与微生物相关，与沉积物总磷含量显著正相关（p<0.05）.水体和沉积物中碱性磷酸酶活性与采样点富营养化程度一致，可以作为白洋淀富营养化的评价指标.

The spatio-temporal variation of alkaline phosphatase activity in water and sediment of Baiyangdian Lake and its impact factors

The spatio-temporal distribution characteristics of alkaline phosphatase activity (APA) in Baiyangdian Lake and its impact factors were analyzed by sampling in eight national monitoring sites from 2011 to 2012. The results showed that APA in Baiyangdian Lake exhibited seasonal and regional variations. APA peaked in summer or autumn and reached minimum in winter, and was higher in eutrophicated sampling sites. Correlative analysis indicated that APA in water was significantly negatively correlated with ammonia nitrogen and phosphorus-nitrogen ratio (p<0.05), and significantly positively correlated with temperature, phytoplankton cell density and total phosphorus (p<0.01). This implied that phytoplankton density could be a main factor affecting APA in water. APA in sediment was probably closely related to the metabolism of microorganisms, and significantly correlated with total phosphorus in sediment (p<0.05). APA in water and sediment were consistent with eutrophication degree, which could be used as an indicator for eutrophication status of Baiyangdian Lake.