台湾海峡水域的β—葡萄糖苷酶活性

本研究分别在1997年8月10日至8月19日，1998年2月20日至3月7日，对台湾海峡进行现场调查研究，在九个断面20个站位取得水文、化学和生物学综合参数，研究该海域β－葡萄糖苷酶活性（βGlcA)，细菌生物量及生产力的时空动态，主要结果如下①夏季台湾海峡南部各站位βGlcA的值为1．94mmol/L^-1h^-1，变化幅度大于（0．31－8．1nmol/L^-1h^-1；冬季海峡北部βGlcA平均值为0．86nmol/L^-1h^-1，变化幅度大（0．34－1．89nmol/L^-1h^-1)远小于夏季。②以碳的转化量表示，夏冬两季的βGlcA分别为0．14μgL6-1h^-1和0．062μgL6-1h^-1，分别高于这两个季节的细菌生产力。③从离岸到近岸，细菌胞外酶活性升高。④该海域胞牙酶活性与细菌的二次生产力的相关性不够明显。⑤βGlcA的剖面分布及周日变化与细菌生产力的相关性不很明显。⑥表层水游离态的细菌的βGlcA，在整个海区的分布特征与该水层的总βGlcA分布特征相似。

-GLUCOSIDASE ACTIVITY IN THE TAIWAN STRAIT

Twenty stations were established in the near shore regions of South Fujian Shoal (λ(E)116°10′～119°00′, φ(N)21°20′～24°10′) on summer and winter cruises during the period from August. 1997 to Feb. and Mar.1998 to investigate the distribution pattern of marine bacterial β-glucosidase activity (βGlcA) by using FMS technique, imporving understanding of the βGlcA distribution, as well as the relationship among marine bacterial biomass, productivity and βGlcA, and environmental factors in the Taiwan Strait. The results show that: ①The average of βGlcA at the Southern stations of the Taiwan Strait in summer is 1.94 nmol/L-1 h-1, while in winter, the average of βGlcA at the Northern stations is 0.86 nmol/L-1 h-1, and the range of varying (0.34～1.89 nmol/L-1 h-1) is much smaller than that in summer (0.31～8.1 nmol/L-1 h-1); ②According to the carbon expression counting, the βGlcA is 0.14 μgc/L-1 h-1 and 0.062 μgc/L-1 h-1 in summer and winter, respectively. They are all higher than the bacterial productivity in the two seasons, respectively; ③The βGlcA gradually rises from off-shore water to near-shore water; ④The correlation between the βGlcA and the bacterial secondary production is not so completely obvious; ⑤The correlation between the section distribution and daily variation of the βGlcA and the bacterial production is not very obvious; ⑥In the surface water, the distribution character of a single bacterial βGlcA is similar with that of the total βGlcA in the whole sea area. Fig 2, Tab 1, Ref 15