中文摘要：

以长江口潮滩作为研究区域,对表层沉积物中碱性磷酸酶活性、解磷微生物量、磷组分及理化性质的时空分布特征进行了分析.结果表明,长江口潮滩湿地沉积物中碱性磷酸酶活性具有显著的季节性、区域性差异,冬季（1月）碱性磷酸酶活性较低,介于0.65～1.59μg.g-.1h-1之间;夏季（8、9月份）最高,变化范围为1.80～5.64μg.g-.1h-1.相关性分析结果显示,碱性磷酸酶活性与解磷细菌数量呈显著的正相关关系（rOPB=0.91,rIPB=0.89,p〈0.01）,说明解磷细菌是影响碱性磷酸酶活性的主要因素之一.同时,碱性磷酸酶活性与磷组分、C/N、盐分等因素显著相关,而与粒度、有机碳氮含量的相关性不显著.

英文摘要：

Spatial and temporal distributions of alkaline phosphatase activity（APA） in the intertidal sediments of the Yangtze Estuary were investigated,together with abundances of phosphate solubilizing bacteria and the phosphorus forms.It was shown that there were significantly seasonal and regional variations of alkaline phosphatase activity in the intertidal sediments.The alkaline phosphatase activities were relatively lower in winter（January）,with values of 0.65 ～ 1.59 μg.g-.1h-1.In contrast,higher alkaline phosphatase activities were detected in summer（August and September）,with values of 1.80 ～ 5.64 μg.g-1.h-1.Statistical analyses indicated that the alkaline phosphatase activities were related significantly to the numbers of phosphate solubilizing bacteria（rOPB = 0.91,rIPB = 0.89,p 0.01）.This implied that the numbers of phosphate solubilizing bacteria were the primary factor controlling the changes of alkaline phosphatase activities.In addition,the alkaline phosphatase activities in the intertidal sediments were also affected by phosphorus forms,C：N molar ratios and salinity.However,there were no significant correlations of the alkaline phosphatase activities with the contents of sand,clay,silt,organic carbon（OC） and organic nitrogen（ON） in the sediments at the study area.