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在渤海的 2 2个站位 ,分 3个航次采集未受扰动的沉积物样品 ,进行了小型底栖动物类群的丰度、分布格局及其与沉积环境因子间相互关系的研究。结果表明 ,1 997年航次 ,5个站位小型底栖动物的平均丰度为 2 2 74± 1 0 3 9ind./1 0 cm2 ;1 998年和 1 999年航次 ,小型底栖动物的丰度分别为 869± 5 0 9ind./1 0 cm2和 63 2± 3 99ind./1 0 cm2 ,其中 ,小型底栖动物和自由生活海洋线虫丰度的高值主要出现在渤海中东部和海峡口的站位 ,底栖桡足类的丰度在海峡口的 A4、E5、D5站和辽东湾湾口的几个站位较高。在小型底栖动物中 ,线虫是数量上占绝对优势的类群 ,桡足类位于第 2位 ,处在第 3位的类群在两个航次中有所不同 ,在 1 998年航次 ,双壳类幼体的数量位于第 3位 ;1 999年航次 ,多毛类的数量位于第 3位。对小型底栖动物丰度与其沉积环境因子的分析表明 ,水深与小型底栖动物丰度、自由生活海洋线虫丰度和桡足类丰度的相关性为极显著 ;沉积物的中值粒径与桡足类的丰度和小型底栖动物总丰度呈负相关 ,前者为极显著 ,后者为显著 ;砂、粉砂和粘土含量影响三者的丰度变动 ,其中与桡足类丰度的相关性为极显著或显著。沉积物中的叶绿素 a、脱镁叶绿酸 a、含水量和有机质含量与三者丰度的关系不很明显。
At 22 stations in the Bohai Sea, undisturbed sediment samples were collected in 3 voyages and the abundances and distribution patterns of meiofauna and their correlation with depositional environmental factors were studied. The results showed that the average abundance of meiofauna at 5 stations in 1997 was 2 2 74 ± 1 0 3 9 ind./1 0 cm2. In 1998 and 1999, the abundance of meiofauna Degrees were 869 ± 5 0 9 ind./1 0 cm2 and 63 2 ± 3 99 ind./1 0 cm2, respectively. Among them, the abundance of meiofauna and free-living marine nematode mainly appeared in the middle and eastern Bohai Sea and the mouth of the strait Of the station, the abundance of benthic copepods in the mouth of the Straits A4, E5, D5 and Liaodong Bay mouth a few stations higher. In the benthic macrozoobenthos, the nematodes are the predominantly dominant species, copepods are located in the second, and the taxa in the third are different between the two voyages. In 1998, the number of bivalves The number of larvae is located at No. 3; in 1999, the number of polychaetes was No. 3. The analysis of meiofauna abundance and its sedimentary environmental factors showed that the correlation between water depth and meiofauna abundance, abundance of free-living marine nematode and copepods abundance was significant. The median diameter of sediment And the copepods abundance and the total macrobenthos abundance was negatively correlated, the former is extremely significant, the latter is significant; sand, silt and clay content affect the abundance of the three changes, which copepods abundance Degree of relevance is extremely significant or significant. The relationship between chlorophyll a, pheophorbide a, water content and organic matter content in sediments is not obvious.