期刊
JOURNAL OF PLANKTON RESEARCH
卷 37, 期 2, 页码 306-319出版社
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbv008
关键词
nutrient limitation; phytoplankton responses; photosynthesis; tropical pacific ocean; subtropical pacific ocean; typology
资金
- National Key Basic Research Program of China [2013CB955700]
- State Oceanic Adimistration project [GASI-03-01-02-05]
Nitrogen and iron largely determine phytoplankton production in the ocean, yet there are few direct incubation studies on nutrient limitation of phytoplankton in the western tropical North Pacific Ocean. Here, we assessed the effects of N and Fe amendments on both photosynthesis and biomass of phytoplankton (including final chlorophyll a biomass and taxonomic composition) in that region. Overall, the carrying capacity of phytoplankton biomass was primarily constrained by N, and Fe was a limiting resource only near the equator where phytoplankton was co-limited by N and Fe. Positive growth responses in nutrient-receiving treatments were predominantly caused by diatoms, sometimes together with Synechococcus. The often strong stimulation of large phytoplankton in these treatments substantially modified the phytoplankton assemblage from picoplankton-to diatom-dominated, which was often accompanied by a significant increase in photosynthetic competence. This is the first report showing that phytoplankton in the tropical western North Pacific are primarily limited by N, and co-limited by Fe in some areas. We combined our results with those from comparable studies in the tropical and subtropical Pacific Ocean to propose a general typology that describes and predicts the long-term effects of rate-limiting N and Fe on phytoplankton final biomass and changes in community structure.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据