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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Calcium carbonate (CaCO3) sediment dissolution under elevated concentrations of carbon dioxide (CO2) and nitrate (NO3-)
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Calcium carbonate (CaCO3) sediment dissolution under elevated concentrations of carbon dioxide (CO2) and nitrate (NO3-)

机译：二氧化碳（CO2）和硝酸盐（NO3-）浓度升高时碳酸钙（CaCO3）沉积物溶解

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Ocean acidification (OA), attributed to the sequestration of atmospheric carbon dioxide (CO2) into the surface ocean, and coastal eutrophication, attributed in part to land-use change and terrestrial runoff of fertilizers, have received recent attention in an experimental framework examining the effects of each on coral reef net ecosystem calcification (G(net)). However, OA and eutrophication in conjunction have yet to receive attention from the perspective of coral reef sediment dissolution. To address this omission, CO2 and nitrate (NO3-) addition experiments were performed in Mo'orea, French Polynesia. Incubation chambers were used to measure sediment Gnet during the day and night under three different [NO3-] (0, 9.8, and 19.7 mu M) that were nested within four separate constructed coral reef communities maintained at different P-co2 levels (417, 721, 1030, and 1333 mu atm, respectively). P-co2 negatively affected sediment Gnet during the day and night, resulting in a shift to diel net dissolution at a P-co2 of 1030 mu atm. Elevated NO3- alone, and the combination of NO3- and P-co2, both negatively affected sediment Gnet at night. However, the response of Gnat to NO3- was less clear during the day, where diurnal sediment Gnat was enhanced under the combined treatment of elevated NO3- and P-co2, resulting in no net effect of NO3- on sediment Gnet on diel timescales. Overall, these results show that ocean acidification represents a greater threat to the balance of calcification and dissolution in Mo'orea's back reef sediment communities than the potential impact of NO3- enrichment on relatively short timescales.
机译：海洋酸化（OA）归因于大气中二氧化碳（CO2）的固存到表层海洋中，沿海富营养化部分归因于土地用途的变化和肥料的地面径流，最近在研究该污染的实验框架中受到关注。各自对珊瑚礁网生态系统钙化的影响（G（net））。然而，从珊瑚礁沉积物溶解的角度来看，OA和富营养化结合起来尚未引起关注。为了解决这一遗漏，在法属波利尼西亚的莫雷阿进行了二氧化碳和硝酸盐（NO3-）的添加实验。孵化室用于在白天和晚上在三种不同的[NO3-]（0、9.8和19.7μM）下测量沉积物Gnet，这些[NO3-]嵌套在四个单独的构造成不同P-co2水平的珊瑚礁群落中（417，分别为721、1030和1333微米大气压）。在白天和晚上，P-co2会对沉积物Gnet产生负面影响，导致P-co2为1030μatm时diel净溶出度的变化。单独升高NO3-以及NO3-和P-co2的组合都会在夜间对沉积物Gnet产生负面影响。但是，白天对Gnat的响应不太清楚，在升高的NO3-和P-co2的联合处理下，昼夜沉积物Gnat增强了，因此在Diel时间尺度上，NO3-对沉积物Gnet的作用没有净影响。总体而言，这些结果表明，海洋酸化对Mo'orea后礁沉积物群落的钙化和溶解平衡构成更大的威胁，而不是在相对较短的时间范围内NO3富集的潜在影响。

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