• 关键词：长江口  沉积物  碱性磷酸酶  解磷细菌  磷组分

• 基金项目：国家自然科学基金项目(No.41071135, 40701167);中央高校基本科研业务费专项基金资助;海洋公益性行业科研专项经费项目(No.200905007);河口海岸学国家重点实验室科研业务经费资助(No.2010RCDW07)

• 姜经梅
• 华东师范大学河口海岸学国家重点实验室, 上海 200062

• 赵慧
• 上海植物园科研中心, 上海 200231

• 沈铭能
• 华东师范大学资源与环境科学学院, 上海 200062

• 丁平兴
• 华东师范大学河口海岸学国家重点实验室, 上海 200062

• 尹国宇
• 华东师范大学河口海岸学国家重点实验室, 上海 200062

• 赵迪
• 华东师范大学河口海岸学国家重点实验室, 上海 200062

• 侯立军
• 华东师范大学河口海岸学国家重点实验室, 上海 200062

• 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0.65~1.59 μg·g^-1·h^-1之间;夏季(8、9月份)最高,变化范围为1.80~5.64 μg·g^-1·h^-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(r_OPB= 0.91,r_IPB= 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.

• Abstract：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^-1·h^-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 (r_OPB= 0.91,r_IPB= 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.

• Key words：Yangtze Estuary  sediment  alkaline phosphatase activity (APA)  phosphate solubilizing bacteria  phosphorus form

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