2011年对莱州湾20个站位进行了4个航次的大型底栖动物调查,共发现177种大型底栖动物,以环节动物、软体动物和节肢动物为主.使用B rey经验公式进行大型底栖动物丰度、生物量、次级生产力和P/B值的计算.结果表明:莱州湾大型底栖动物年均丰度为3057.69 ind ·m-2,生物量为3.45 g·m-2(去灰干质量),次级生产力为5.60g·m-2·a-1(去灰干质量),P/B值为1.59 a-1.相关分析表明,除生物量和丰度之外,叶绿素a含量是影响次级生产力的重要环境因子.群落组成中以个体小、生活史短、代谢快的底栖动物为主.通过估算得出,莱州湾大型底栖动物的次级生产力约为3.48×104 t·a-1(去灰干质量),约1.93×105 t·a-1(鲜质量).
Secondary productivity of macrobenthos in Laizhou Bay, East China
A four-cruise investigation was conducted on macrobenthos at 20 sampling locations in Laizhou Bay,East China in 2011.A total of 177 macrobenthic species were recorded,of which,polychaete,mollusk,and arthropod were dominant.Brey's empirical formula was used to analyze the abundance,biomass,secondary productivity,and P/B ratio of the macrobenthos in Laizhou Bay.The results showed that the annual mean abundance was 3057.69 ind · m-2 mean biomass in ash-free dry mass (AFDW) was 3.45 g · m-2,mean secondary productivity in AFDW was 5.60 g · m-2 · a-1,and the mean P/B ratio was 1.59 a-1.Correlation analysis indicated that the secondary productivity was impacted by the chlorophyll-a concentration in water as well as the biomass and abundance.Species of small size,short life-cycle and rapid metabolism were dominant in the macrobenthic community composition.An estimate of the annual mean secondary productivity of the macrobenthos in Laizhou Bay was 3.48×104 t for AFDW and 1.93×105 t for wet mass.
macrobenthossecondary productivityP/B ratioenvironmental variablesLaizhou Bay