Abstract: 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.

Key words: urban tree., pervious pavement, impervious pavement, net photosynthetic rate, chlorophyll fluorescence