福建罗源湾海水悬浮物的研究

SUSPENDED MATTER IN LUOYUAN BAY SEAWATER, FUJIAN

于1986年11月—1987年9月对福建罗源湾海水悬浮物的含量的观测结果表明,水动力条件引起的再悬浮过程和生物活动分别是罗源湾冬季和夏季悬浮物分布及性质变化的主要影响因素。底部沉积物的再悬浮对水体营养盐的再生和补充及有机碎屑的提供起重要的作用,但也引起了海水透明度的下降,对海区浮游植物的分布及生产力水平有一定的影响。夏季颗粒有机碳的沉降通量一般占水柱浮游植物初级生产量的67—85％,大部分初级生产的有机碳沉降海底。

Distributions and features of total suspended matter (TSM) in Luoyuan Bay seawater were studied during six cruises from November 1986 to September 1987. It was found that re-suspension of sediments takes an importment role in controlling the distribution of TSM in winter. However, the distribution of TSM in summer depends on biological processes and river inputs. The chemical compositions of the particles also showed a seasonal variations. The correlation between TSM and particulate organic carbon (POC) showed that the content of POC was related to biological activities when the primary production was enhanced from May to September, whereas the content of POC was controlled by the terrestrial input as the primary production was low from November to March. Increment of TSM caused by resuspension can result in the decline of transparency and further affects the level of primary production of the bay. But, it can also increase the availability of nutrients by releasing them from the resu-spended particles. The ratio of POC flux to the primary production is about 67-85% in summer estimated from the sediment traps. POC from the primary producers settling to the sediments can play an important role in the detritus foodchain in Luoyuan Bay seawater.