辽东湾网采浮游植物粒级结构的胁迫响应

基于2012~2014年春、夏、秋、冬季辽东湾网采浮游植物及环境因子的调查资料,对辽东湾南、北2个区域的浮游植物粒级结构分布规律及其环境胁迫响应进行了分析,并评估了浮游植物群落结构的稳定性.结果表明,辽东湾海域浮游植物春、夏、秋季丰度主要集中在小粒径范围,冬季主要集中在中粒径范围;生物量春、夏、秋季主要集中在中粒径范围,冬季主要集中在大粒径范围,南部区域浮游植物粒径整体上大于北部区域.寡营养水域以及较低的水温环境更适于大粒径浮游植物生存.春、秋、冬季浮游植物群落结构比较稳定,但夏季偏离平衡点.南部区域群落结构整体上比北部区域稳定,网采中、大粒径组的W统计量可以作为浮游植物群落结构稳定性的评估指标.

The stress response of net phytoplankton biomass size structure in Liaodong Bay

Based on net collection of phytoplankton samples in Liaodong Bay in all four seasons during 2012~2014, the distribution pattern of size structure of phytoplankton and its response to environmental stress were analyzed in the northern and southern areas of the bay. The stability of the phytoplankton community was estimated and was found to be dominated by small species in spring, summer and autumn, and by medium-sized species in winter. Phytoplankton biomass was controlled by medium-sized species in spring, summer and autumn, and by large species in winter. In general, phytoplankton sizes in the southern area were greater than those in the northern area. Large phytoplankton species were much more adaptive to oligotrophic water and a colder environment. The phytoplankton community in spring, autumn and winter was relatively stable; however, it deviated from equilibrium in summer. Phytoplankton community stability in the southern area was slightly better than in the northern area. The W statistical value of the group of large species can be used as an evaluation index of phytoplankton community stability.