Sources of organic matter and paleo-environmental implications inferred from carbon isotope compositions of lacustrine sediments at Inexpressible Island, Ross Sea, Antarctica
Sources of organic matter and paleo-environmental implications inferred from carbon isotope compositions of lacustrine sediments at Inexpressible Island, Ross Sea, Antarctica
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DOI：
10.13679/j.advps.2016.4.00233
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发表时间：
2016-10
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影响因子：
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通讯作者：
Wei Yangyang;Jin Jing;Nie Yaguang;Chen Xin;Wu Libin;F. Pingqing;L. Xiaodong;S. Emslie
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文献类型：
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作者：
Wei Yangyang;Jin Jing;Nie Yaguang;Chen Xin;Wu Libin;F. Pingqing;L. Xiaodong;S. Emslie
通过对南极罗斯海不可表达岛（Inexpressible Island，Ross Sea）两个柱状样（IIL 1和IIL 9）有机质碳同位素组成（δ 13 C org）的测定，分析了有机质的来源。IIL 9沉积物的δ 13 C org值在−14.6‰和−11.6‰之间变化，平均值为−13.4‰（n=48）。这些值明显高于IIL 1沉积物的值，IIL 1沉积物的值在−23.2‰和−20.4‰之间变化，平均值为−21.8‰（n=55）。这两个柱状样的δ 13 C org值的变化表明有机质的来源不同。IIL 9的δ 13 C org值相对较高，与藻类的来源一致，而IIL 1的δ 13 C org值较低，表明受企鹅粪的影响较大，藻类为次要来源。与其他高纬度湖泊沉积物和植物的参考数据相比，IIL 9的δ 13 C org值非常高，这可能与该相对较浅的池塘中藻类在生长季节对CO2同化的激烈竞争有关。这些结果表明，沉积δ 13 C org是一个可靠的代理在无法表达的岛屿池塘古初级生产力。引文：魏永永，靳军，聂永国，等。南极罗斯海不可言岛湖相沉积物碳同位素组成及其有机质来源和古环境意义。Adv Polar Sci，2016，27：233-244，doi：10.13679/j.advps.2016.4.00233
The carbon isotopic composition of organic matter (δ 13 C org ) was determined in two sediment cores (IIL1 and IIL9) recovered from Inexpressible Island, Ross Sea, Antarctica, and analyzed to identify the sources of that organic matter. The δ 13 C org values of sediments of IIL9 were found to vary between −14.6‰ and −11.6‰, with a mean of −13.4‰ (n=48). These values were significantly higher than those of IIL1 sediments which varied between −23.2‰ and −20.4‰, with a mean of −21.8‰ (n=55). The variation in δ 13 C org values in these two sediment cores indicate different sources of organic matter. The relatively high δ 13 C org values in IIL9 are in accordance with a source from algae, while the low δ 13 C org values in IIL1 evince significant influence from penguin guano with algae as the secondary source. Compared with the reference data from other high-latitude lake sediments and plants, the δ 13 C org values in IIL9 were extremely high, a result likely related to intense competition for CO 2 assimilation among algal species during the growing season in this relatively shallow pond. These results indicate that sedimentary δ 13 C org is a reliable proxy for paleo-primary productivity in ponds at Inexpressible Island. Citation: Wei Y Y, Jin J, Nie Y G, et al. Sources of organic matter and paleo-environmental implications inferred from carbon isotope compositions of lacustrine sediments at Inexpressible Island, Ross Sea, Antarctica. Adv Polar Sci, 2016, 27: 233-244, doi: 10.13679/j.advps.2016.4.00233