CARBON-DIOXIDE LIMITATION OF MARINE-PHYTOPLANKTON GROWTH-RATES
CARBON-DIOXIDE LIMITATION OF MARINE-PHYTOPLANKTON GROWTH-RATES
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DOI：
10.1038/361249a0
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发表时间：
1993-01-21
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：
RIEBESELL, U;WOLFGLADROW, DA;SMETACEK, V
溶解无机碳（DIC）的供应不被认为限制海洋初级生产力1，因为其在海水中的浓度分别超过硝酸盐和磷酸盐等其他植物大量营养素的两个和三个数量级。但是，大部分海洋新产量2和垂直碳通量的主要部分是由一些硅藻属介导的，这些硅藻属利用CO2以外的DIC成分（占总DIC3的<1%）的能力尚不清楚4。这里我们表明，在最佳光照和营养条件下，硅藻生长速度实际上会受到CO2供应的限制。因此，自上次冰河作用以来，地表水 PCO2 水平从 180 到 355 p.p.m.5,6 翻了一番，这可能刺激了海洋生产力，从而增加了生物泵对海洋的碳封存。
THE supply of dissolved inorganic carbon (DIC) is not considered to limit oceanic primary productivity1, as its concentration in sea water exceeds that of other plant macronutrients such as nitrate and phosphate by two and three orders of magnitude, respectively. But the bulk of oceanic new production2 and a major fraction of vertical carbon flux is mediated by a few diatom genera whose ability to use DIC components other than CO2, which comprises < 1% of total DIC3, is unknown 4. Here we show that under optimal light and nutrient conditions, diatom growth rate can in fact be limited by the supply of CO2. The doubling in surface water PCO2 levels since the last glaciation from 180 to 355 p.p.m.5,6 could therefore have stimulated marine productivity, thereby increasing oceanic carbon sequestration by the biological pump.