南黄海大型底栖生物次级生产力研究

根据2000年秋季和2001年春季在南黄海24个大面站进行的大型底栖生物定量采集样品资料,利用Brey’s(1990)的经验公式对调查海区进行了大型底栖生物栖息密度、生物量、次级生产力和P/B值的研究计算.结果表明,该海域大型底栖生物平均栖息密度在2000年秋季为154.2个/m2,与2001年春季的147.8个/m2相当,平均生物量以去灰干重计,秋季为6.92g/m2,远高于春季的2.81g/m2;年平均次级生产力以去灰干重计,为4.98gm-2a-1.与生物量的分别格局相似,次级生产力在所调查海域的西南和东南部有两个高生产力分布区域,而该二区域正好在黄海冷水团的两侧,由此验证大型底栖生物的生物量和次级生产力受海水温度的影响较大.平均P/B值在研究海域为1.10a-1.与渤海研究结果比较,证明了底栖生物群落生产力随水深增大而下降,P/B值随水温升高而升高.图2表2参31

SECONDARY PRODUCTION OF MACROBENTHOS IN SOUTHERN YELLOW SEA

Based on the data obtained from 24 stations in autumn 2000 and spring 2001, the secondary production of macrobenthos in the southern Yellow Sea was calculated with Brey's (1990) empirical formula. The results showed that the mean abundance in autumn (2000)was 154.2 ind./m2, subequal to that in spring (2001), 147.8 ind./m2; the mean biomass in AFDW (ash -free dry weight) in autumn was 6.92 g/m2, much more than that in spring (2.81 g/m2); and the mean annual secondary production in the study area was 4.98 g (AFDW) m-2 a-1. There were two centers of high production, as well as biornass, in southwest and southeast of the study area. The biomass and production of macrobenthos were affected by water temperature, as the two higher value centers of biomass and production distributed outside of the Yellow Sea Cold Water Mass. The average annual macrobenthic P/B ratio (ratio of production to biomass) of the southern Yellow Sea was 1.10 a-1. Comparing with the results production = 6.49 g (AFDW) m-2 a- 1; P/B = O. 82 a- 1 ] from the Bohai Bay, it was confirmed that the community production decreased with the increasing of water depth, and P/B ratio increased with the rising of water temperature. Fig 2, Tab 2, Ref 31