IMPORTANCE OF IRON FOR PLANKTON BLOOMS AND CARBON-DIOXIDE DRAWDOWN IN THE SOUTHERN-OCEAN
IMPORTANCE OF IRON FOR PLANKTON BLOOMS AND CARBON-DIOXIDE DRAWDOWN IN THE SOUTHERN-OCEAN
复制标题
DOI：
10.1038/373412a0
复制
发表时间：
1995-02-02
期刊：
影响因子：
64.8
通讯作者：
SMETACEK, V
中科院分区：
文献类型：
--
作者：
DEBAAR, HJW;DEJONG, JTM;SMETACEK, V
铁假说（1-3）-铁是浮游生物生产力和随之而来的CO2吸收的限制性营养素的建议-已经通过在亚北极太平洋（2，4）和南太平洋（5-7）的培养瓶中进行的小规模实验以及最近在赤道太平洋（8，9）进行的大规模实验进行了验证。在南极绕极流（ACC）的南部分支中，深层沃茨的上涌为表层提供了足够的铁，以维持适度的初级生产，但不允许水华发展。相反，在极锋（PF）的快速流动、富含铁的急流中，春季水华产生的浮游植物生物量比ACC南部沃茨大一个数量级，导致CO2不饱和。富铁PF沃茨与邻近贫铁沃茨明显不同，表明铁的有效性是允许水华发生的关键因素。
THE iron hypothesis(1-3)-the suggestion that iron is a limiting nutrient for plankton productivity and consequent CO2 drawdown-has been tested by small-scale experiments in incubation bottles in the subarctic Pacific(2,4) and Southern(5-7) Oceans, and by a recent large-scale experiment in the equatorial Pacific Ocean(8,9). Here we test the idea by looking at natural levels of productivity in regions of the Southern Ocean with differing iron abundance, In the southerly branch of the Antarctic circumpolar current (ACC), upwelling of deep waters supplies sufficient iron to the surface to sustain moderate primary production but not to permit blooms to develop, In contrast, within the fast-flowing, iron-rich jet of the polar front (PF), spring blooms produced phytoplankton biomass an order of magnitude greater than that in southern ACC waters, leading to CO2 undersaturation. The plankton-rich PF waters were sharply delineated from adjacent iron-poor waters, indicating that iron availability was the critical factor in allowing blooms to occur.