海洲湾大型底栖动物群落组成及次级生产力

Macrobenthic community composition and it's secondary productivity in the Haizhou Bay

依据2015年春、夏、秋、冬4个季节在海洲湾10个站点采集大型底栖动物样品,分析各季节大型底栖动物的栖息丰度和生物量,并采用Brey经验公式进行大型底栖次级生产力和P/B计算,结果显示,2015年海洲湾大型底栖动物平均丰度13.00 ind·m^(-2),平均生物量2.37[g(AFDM)·m^(-2)],年平均次级生产力和P/B值分别为1.50[g(AFDM)·m^(-2)·a^(-1)]和0.63。空间分布上,海洲湾大型底栖动物生物量和平均次级生产力的空间分布为远岸>近岸。季节分布上,年平均次级生产力最高出现在秋季,为2.04[g(AFDM)·m^(-2)·a^(-1)],最低出现在夏季,为1.00[g(AFDM)·m^(-2)·a^(-1)];P/B值最高的是冬季,为0.76,最低的是春季,为0.57。与其它研究调查中江苏近海、南黄海辐射沙脊群相比,海洲湾大型底栖动物年平均次级生产力与之基本持平。

The secondary productivity of macrobenthic is an important component of matter recycle and energy flow in marine ecosystem.There has been extensive studies,but the research in the Haizhou Bay is limited.In order to get a better understanding of the secondary productivity of macrobenthic in the Haizhou Bay,the seasonal data in 2015 were collected.According to macrobenthic biomass and abundance obtained in the Haizhou Bay and using Brey＇ s empirical formula,we calculated the secondary productivity and P/B ratio.The results showed that the mean secondary productivity of macrobenthos in studied area was 1.50 [g（AFDM）/（m^2·a）^（-1）] and P/B ratio was 0.63.Sampling stations with high macrobenthic biomass and secondary productivity were mainly located in areas where water depth was 18 to 30 meters,while those with water depth in 20 meters were lower.As for seasonal distribution,the highest secondary productivity was in autumn,2.04 [g（AFDM）/（m^2·a）^（-1）],while the lowest value was in summer,1.00 [g（AFDM）/（m^2·a）^（-1）].The highest P/B value 0.76 appeared in winter and the lowest value 0.57 appeared in spring.Compared with other areas,secondary productivity was similar to the offshore of Jiangsu and the radiative sand ridge filed of the South Yellow Sea.