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The spatial distribution of Cu, Cr, Cd, Pb, Ni and Co in the Jiaozhou Bay seawater and their distribution among different size fractions were investigated. The distribution mechanism of trace metals and the influence of environmental factors such as plankton activity and salinity during the distribution process were also discussed. The results showed that the highest values for most trace metals were distributed along north and northeast coast, while Cd and Pb also presented high value areas in the mouth and middle of the bay respectively. The trace metals in the Jiaozhou Bay seawater were mostly partitioned in the <1 kDa fraction with an average value of 70.1%, of which the percentages of Cu and Cd were up to 79.0% and 77.6% respectively, while Pb was only 58.2%. Similarly, the bulk dissolved organic carbon was also mostly partitioned in the <1 kDa size fraction with an average value of 73.1%. Spectroscopic properties indicated that low molecular weight (LMW, <1 kDa) fractions which mainly composed of humic-like organic matters contained more effective functional groups like hydroxyl and carboxyl groups and had higher complexing capacities with trace metals. There were significant positive correlations between chlorophyll a concentrations and high molecular weight (HMW, >1 kDa) proportions, indicating that primary production by phytoplankton in the euphotic zone was the major source of HMW dissolved organic matters in seawater and influenced complexation between trace metals and dissolved organic matters. The top area of the Jiaozhou Bay with lower salinity was characterized with higher proportions of large size components, which may be resulted from the combined effects of biological activity, terrestrial input and salinity.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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