台湾海峡生源要素生物地球化学过程研究

Studies on Biogeochemical Process of Biogenic Elements in the Taiwan Strait

以微型生物食物网在 C和 P的生物地球化学循环中的动力学为核心 ,研究了台湾海峡主要生源要素生物地球化学循环的物理驱动力 ,物理与生物、化学过程的耦合 ,微型浮游生物对碳循环的贡献等 .结果表明 ,在大的时空尺度上 ,该海域碳及磷的生物地球化学循环主要受水动力调控 ;夏季南部海峡表现为大气 CO2 的强源、溶解有机碳是主要的有机碳形态、颗粒有机碳中陆源约占 6 0 % ;夏季上升流是上层磷的重要来源 ,其贡献约占光合作用所需磷的 16 % ,对生物生产力有着不可忽视的作用 ;该海域以微型 (Nano)和微微型 (Pico)浮游植物为主 ,其对生物量和生产力的贡献可高达6 0 %和 80 % ,浮游植物的初级产量有一大部分为细菌和异养鞭毛虫所利用 ,异养鞭毛虫表现了较高的生态传递效率 ,微食物网对传统食物网的贡献可达三分之一 .此外 ,还从物理、化学、生物耦合的角度探讨了

This paper studied the biogeochemical process of biogenic elements in the Taiwan Strait from hydrology, coupling of physical, chemical and biolgical process, the contribution of microplankton to carbon cycling. The results showed that in large scale, biogeochemical cycling of carbon and phosphate was regulated by hydrology in this area; south areas of Taiwan Strait showed a strong source of CO2 in air in summer, dissolved organic carbon was the major organic species and 60% of particulate organic carbon came from continent;up welling was an important source for up layer phosphate in summer,which contributed about 16% to phytoplankton photosynthetic phosphate and played an important role in biological productivity;Nano and pico phytoplankton dominated phytoplankton in this aera, the contributions to biomass and primary productivity were over 60% and 80% respectively, majority of primary productivity was consumed by bacteria and hetero dinoflagellates, the later also showed high transferring efficiency in eco system, and the contribution of microbial food web to traditional food web was about 30%. This paper also discussed effects of ENSO on ecological environment from the coupling of physics, chemistry and biology.