莱州湾大型底栖动物的次级生产力

Secondary productivity of macrobenthos in Laizhou Bay,East China

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Brey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5.60 g·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3.48×104t·a-1(去灰干质量),约1.93×105t·a-1(鲜质量)。

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.