摘要
通过4个季节(1991年11月—1992年7月)的现场实验观测,初步研究了胶州湾表层浮游生物群落的NH_4^+-N吸收、再生通量的有关问题。结果表明,NH_4^+-N吸收、再生通量的季节变化为:夏季>春、秋季>冬季;周日变化为:吸收通量在白天大于夜间,再生通量夜间大于白天;全年平均,吸收通量为0.073μ mol/(L·h),再生通量为0.053μ mol/(L·h),再生通量始终小于吸收通量;NH_4^+-N的周转时间最长为16.34d(冬季),最短为0.68d(夏季);吸收通量主要来自Picoplankton(占总量的46％—57％);NH_4^+-N吸收具有光依赖性,不同粒级的光依赖顺序为:Netplankton>Nanoplankton>Picoplankton。
The results from a series of four cruises (Nov. 1991-Jul. 1992) to examine fluxes of ammonium uptake and regeneration of microplankton assemblages in the Jiaozhou Bay are presented. The seasonal variations of the uptake and regeneration fluxes were in the order: summer > spring/autumn > winter, the annual fluctu tion of regeneration flux was more obvious than that of uptake flux. The diurnal pattern was characterized by higher uptake in the daytime and higher regeneration during the night. Averaged uptake and regeneration fluxes On an annual scale were 0.073 and 0.053nmol/(L·h) respectively. Regeneration fluxes were always less than uptake fluxes throughout the year, regenerated ammonium met 87%, 42%-48% and 11% of the uptake demand in summer, spring/autumn, and winter respectively. The longest turnover time was 16.34 d being found in winter, and the shortest turnover time was 0.68 d occured in summer. The uptake flux was contributed mainly by the smallest fraction--picoplankton, nanoplankton came the second, and netplankton the last. Ammonium uptake was to some extent depend on light, but forceful direct irradiation has a negative effect on it. Ammonium regeneration, on the other hand, was not sensitive to light availability. The extents of light-dependence of ammonium uptake by different size fractions were in the order; netplankton >nanoplankton > picoplankton.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1993年第3期217-225,共9页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金
关键词
氨吸收和氨再生
浮游生物
胶州湾
Ammonium uptake and regeneration Microplankton Jiaozhou Bay
