Standing stocks and production rates of phytoplankton and abundance of bacteria in the Seto Inland Sea, Japan
Standing stocks and production rates of phytoplankton and abundance of bacteria in the Seto Inland Sea, Japan
复制标题
日本濑户内海浮游植物的现存量、生产率和细菌丰度
DOI：
10.1007/bf02742613
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发表时间：
1998
影响因子：
2.3
通讯作者：
Toshiya Hashimoto
中科院分区：
文献类型：
--
作者：
K. Tada;Koji Monaka;M. Morishita;Toshiya Hashimoto
在1993年10月、1994年1月、4月和6月的4个季节里，对日本濑户内海39个站位的浮游植物现存量、生产率和细菌丰度进行了调查。用13 C示踪法测定初级生产力。光合速率变化范围为0.41 ~ 32.1 μgC/l/h，平均值为4.67 μgC/l/h。年初级生产量估计为218 gC/m2/年。本研究的年初级生产量是以前报道的同一地区的1.8倍。我们的初级生产力值与以前的值不一致的原因，不是由于测量初级生产力的方法不同或叶绿素浓度不同，而是由于从体外测量中估算真光层初级生产力的方法不同。在同一次航行中，还检查了表层海水中细菌细胞的分布情况。细菌细胞密度为0.32 ~ 3.4× 106个/ml。在广岛湾和大坂湾的富营养区中，细菌的密度相对较高。此外，在所那田内Chl. a相对较低的区域中，也观察到了较高的细菌密度。索纳达叶绿素a和细菌密度之间的差异表明，细菌丰度可以控制的其他浮游植物分泌物的底物的可用性。
Standing stocks and production rates of phytoplankton and abundance of bacteria were investigated at 39 stations in the Seto Inland Sea, Japan during four crulses in October 1993, January, April and June 1994. Primary productivity was measured by the13C tracer method. Photosynthetic rate varied from 0.41 to 32.1 μgC/1/h with an average value of 4.67 μgC/l/h. Annual primary production was estimated to be 218 gC/m2/year. Annual primary production in this study was 1.8 times as high as the values which were previously reported at same area. The reason for the disagreement between our primary production value and previous values is not thought to be due to the difference of methods used for measuring primary production or the different Chl.aconcentrations but to the method of estimating the primary production in the euphotic zone from thein vitromeasurements. The distribution of bacterial cells in surface seawater was examined during the same cruises. Bacterial cell density ranged from 0.32 to 3.4×106cells/ml. The density was relatively high in the eutrophic regions of Hiroshima Bay and Osaka Bay In addition, a high density of bacteria was also observed in an area within Suo Nada where Chl.awas relatively low. The disparity between Chlaand bacterial density in Suo Nada suggests that bacterial abundance can be controlled by the availability of substrates other than phytoplankton exudate.