收稿日期: 2001-06-04
修回日期: 2001-10-22
网络出版日期: 2002-08-01
基金资助
中国科学院知识创新工程重要方向项目“南极辐合带—Dome A断面上的全球变化研究”（编号：KZCX2-303）；国家自然科学基金项目“渤海生物—物理相互作用的过程研究”（编号：49976032）”资助.
IRON HYPOTHESIS AND THE IN SITU IRON FERTILIZATION EXPERIMENTS IN THE HNLC REGIONS
Received date: 2001-06-04
Revised date: 2001-10-22
Online published: 2002-08-01
20世纪90年代，JohnMart in提出的"铁假说（ironhypothesis）"和以此为中心的海洋铁加富实验（ironenrichments）成为海洋科学领域最受瞩目的事件。"铁假说"的主要内容是：铁限制了HNLC海区中浮游生物的生产力，并进而影响了CO2由海洋上层向深层的输出；如果在HNLC海区加入铁，就可以促进浮游植物的生长，消耗掉过剩的 N、P营养盐，加速C从海洋表层向深层输出，最终降低大气中CO2含量，缓解温室效应。在赤道太平洋和南大洋进行的现场加富实验证明，加入铁以后，这些海区的浮游植物生物量增加，N、P等营养盐被消耗。但是，这些实验并没有降低大气中CO2含量。铁假说只被证实了一半。
孙松 , 张武昌 . 铁假说和HNLC海区的现场铁加富实验[J]. 地球科学进展, 2002 , 17(4) : 613 -616 . DOI: 10.11867/j.issn.1001-8166.2002.04.0613
The iron hypothesis of John Martin and the in situ iron fertilization experiments in the HNLC regions were the most exciting events in the 1990s. Changes in iron supply to oceanic plankton are thought to have a significant effect on concentrations of atmospheric carbon dioxide by altering rates of carbon sequestration, a theory known as the “iron hypothesis”. For this reason, it is important to understand the response of pelagic biota and atmospheric carbon dioxide to increased iron supply. Three in situ iron enrichment experiments， IronEx1 and IronEx2 (in eastern equatorial Pacific), SOIREE (in Southern Ocean)， were carried out to test the contentious hypothesis. These experiments confirmed that the increased iron supply led to elevated phytoplankton biomass and rates of photosynthesis in surface waters. But downward export of biogenic carbon did not increased. Estimates of the CO2 amount removed from the atmosphere by the iron-related phytoplankton bloom remained uncertain. The “iron hypothesis” is still a hypothesis.
［1］ Chisholm S W, Morel FMM. Preface［J］. Limnology Oceanogrophic, 1991, 36(8): Ⅰ-Ⅵ.
［2］ Martin J H, Fitzwater S E. Iron deficiency limits phytoplankton growth in the north-east pacific subarctic［J］. Nature, 1988, 331:341-343.
［3］ Martin J H. Glacial-interglacial CO2 change: the iron hypothesis［J］. Paleoceanography, 1990, 5:1-13.
［4］ Watson A, Liss P, Duce R. Design of a small-scale in situ iron fertilization experiment［J］. Limnol Oceanogr, 1991, 36: 1 960-1 965.
［5］ Ledwell J R, Watson A J, Law C S. Evidence for slow mixing across the pycnocline from an open-ocean tracer-release experiment［J］. Nature, 1993, 364: 701-703.
［6］ Wells M L. Pumping iron in the Pacific［J］. Nature, 1994, 368: 295-296.
［7］ Martin J H, Coale K H, Johnson K S, et al. Testing the iron hypothesis in ecosystems of the equatorial Pacific Ocean［J］. Nature, 1994, 371: 123-129.
［8］ Coale K H, Johnson K S, Fitzwater, et al.A massive phytonplankton bloom induced by an ecosystem-scale iron fertilization experiment in the equatorial Pacific Ocean［J］. Nature, 1996, 383: 495-501.
［9］ Frost B W. Phytoplankton bloom on iron rations［J］. Nature, 1996, 383: 475-476.
［10］ Cooper D J,Watson A J, Nightingale P D. Large decrease in ocean-surface CO2 fugacity in response to in situ iron fertilization［J］. Nature, 1996, 383: 511-513.
［11］ Chisholm S W. Stirring times in the Southern Ocean［J］. Nature, 2000, 407: 685-687.
［12］ Boyd P W,Watson A J, Law C S, et al.A mesoscale phytoplankton bloom in the polar Southern Ocean stimulated by iron fertilization［J］. Nature, 2000, 407: 695-702.
［13］ Watson A J, Bakker D C E, Ridgwell A J, et al. Effects of iron supply on Southern Ocean CO2 uptake and implications for glacial atmospheric CO2［J］. Nature, 2000, 407: 730-733.
［14］ Banse K. Does iron really limit phytoplankton production in the offshore subarctic Pacific?［J］. Limnol Oceanogr, 1990, 35: 772-775.
［15］ Peng T H, Broecker W S. Dynamical limitation on the Antarctic iron fertilization strategy［J］. Nature, 1991, 349: 227-229.
［16］ Broacker W S, Henderson G M. The sequence of events surrounding termination Ⅱ and their implications for the causes of glacial interglacial CO2 changes［J］. Paleoceanography, 1998, 13: 352-364.
［17］ Turner S M, Nightingale P D, Spokes L J, et al. Increased dimethyl sulphide concentrations in sea water from in situ iron enrichment［J］. Nature, 1996, 383: 513-517.
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