大亚湾海域尿素与浮游生物脲酶活性研究  

Distributions of urea concentration and urease activity in the Daya Bay

作　　者：张云[1] 黄凯旋[1] 欧林坚[1] 覃仙玲[1] 王朝晖[2] 黄道建 齐雨藻[1] 

机构地区：[1]暨南大学赤潮与海洋生物学研究中心、水体富营养化与赤潮防治广东省教育厅重点实验室,广东广州510632 [2]暨南大学水生生物研究所,广东广州510632 [3]华南环境科学研究所,广东广州510632

出　　处：《热带海洋学报》2014年第1期90-96,共7页Journal of Tropical Oceanography

基　　金：国家自然科学基金(41176087,41276153);国家环境保护总局公益性行业科研专项经费项目(200909046);中央高校基本科研业务费专项资金(21611205)

摘　　要：于2010~2011 年间分4 个季节, 对大亚湾海域尿素浓度及浮游生物的脲酶活性开展调查研究, 结合相关理化环境及生物因子, 分析大亚湾海域尿素的可利用性及其对浮游植物群落演替的影响.结果表明, 海区尿素浓度变化范围为0.81~8.54μmol N·L-1, 夏季尿素含量最高, 达4.32 ± 1.65μmol N·L-1; 冬季含量最低, 为1.57 ± 0.49μmol N·L-1.夏、秋季节有很多站位尿素水平甚至超过溶解无机氮（dissolved inorganic nitrogen, DIN）含量1~3 倍, 表明尿素是大亚湾海域浮游植物生长不可忽略的重要氮源.较高水平的尿素主要分布在养殖区和靠近陆地的近岸海域.浮游生物脲酶活性在秋季最高, 平均达61.0 ± 33.6nmol N·L-1·h-1, 冬、春季脲酶活性常低于检出限.在秋季, 浮游生物脲酶活性与甲藻密度密切相关.脲酶已被证明是大洋中浮游植物水解尿素的最主要途径, 因此尿素可能在-定程度上影响大亚湾甲藻等浮游植物的生长.Cruises were carried out to survey urea concentration and urease activity together with other environmentalparameters in the Daya Bay. The bioavailability of urea for succession in the phytoplankton community was analyzed based onthese cruise data. The results showed that the average concentration of urea varied from 0.81 to 8.54 μmol N·L-1 in the fourseasons. The urea concentration was the highest in summer, up to 4.32±1.65μmol N·L-1, and the lowest in winter, up to1.57±0.49 μmol N·L-1. There were many stations where urea concentrations were 1-3 times higher than dissolved inorganicnitrogen （DIN） in summer and autumn, which suggested that urea as one important nitrogen source should not be ignored inthe growth and productivity of phytoplankton in the Daya Bay. Higher levels of urea were distributed in the aquaculture areaand the nearshore waters where sewage drains were located. Plankton urease activities were the highest in autumn, up to 61.0 ±33.6 nmol N ·L-1·h-1; however, in winter and spring the urease activities were often below the detection limit. Dinoflagellatesdensities were closely related to urease activities in autumn. Urease activity has been shown to be the most important way inthe hydrolysis of urea by of phytoplankton in the oceans, so urea may affect the growth of dinoflagellates and otherphytoplankton in the Daya Bay.

关 键 词：尿素 脲酶活性 甲藻 大亚湾 

分 类 号：P735.4[天文地球—海洋生物学] Q178.53[天文地球—海洋科学]