摘要
于1986年1月和7月在长江口及其附近海域进行了细菌的落射荧光直接计数和三磷酸腺苷(ATP)浓度的测定,同时取分样进行了微生物呼吸作用耗氧速率和叶绿素浓度的测定。结果表明,细菌数量和ATP浓度夏季较冬季高,总的分布趋势是,高值区出现在内河段和长江口,向外海逐渐降低;细菌数同悬浮体浓度、硝酸盐浓度和耗氧速率呈正相关,与盐度呈负相关。冬季,在整个海域细菌是ATP的主要贡献者和溶解氧的主要消耗者;夏季,沿冲淡水方向ATP出现两个峰值,第一峰值出现在长江口的最大浊度带,由细菌所贡献;第二个出现在盐度25—30的区域,由浮游植物所贡献。呼吸作用耗氧速率也呈现了与ATP相似的分布特征。
Two cruises were conducted in January and July 1986 in the Changjiang Estuary and its adjacent East China Sea (30°30'-32°00'N, 121°00'-124°00'E), where the water depth was from 10 m in the river mouth to more than 50 m in the southeastern part of the studied area.Direct epifluoresence microscopic counts of planktonic bacteria were made and ATP concentrations determined. Subsamples were taken for measuring oxygen consumption rates and chlorophyll a concentrations.Bacteria and ATP concentrations were higher in summer than in winter. The highest abundance of bacteria occurred in the river and river mouth, and decreased gradually offshore. The bacteria number was correlated positively with suspended matter, nitrates and oxygen consumption rates, and negatively with salinity. In winter bacteria were the main contributors of ATP and the main consumers of dissolved oxygen in the whole studied area. In summer two maxima of ATP were found along the salinity gradient, the first one coincided with turbidity peak near the river mouth and was attributed to bacteria. The second occurred in waters with salinity between 25 and 30 and was attributed to phytoplankton. Similar feature was observed for oxygen consumption.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1992年第3期288-296,共9页
Oceanologia Et Limnologia Sinica
基金
国家海洋局和法国科研中心提供经费 课题号84105
关键词
细菌
三磷酸腺苷
微生物
河口生态
Bacteria, ATP, Microbiology, Oxygen consumption rates, Estuary ecology
