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通过对南海中部沉积物捕集器中浮游有孔虫的氧、碳稳定同位素分析,探讨了它们与海洋学参数之间的关系。分析结果显示,G.ruber的δ18O值和δ13C值都比G.sacculifer的轻;两者的δ18O差值(Δδ18O)平均为0.520‰,δ13C差值(Δδ13C)平均为0.544‰,证明G.ruber的生活水深(约30m)比G.sacculifer的(约50m)浅。G.ruber与G.sacculifer之间的Δδ18O呈现夏季大、冬季小的特点,可能与海水的垂向温度梯度在夏季较大有关。G.ruber幼体的δ13C比成年个体的轻,幼体的δ18O比成年个体的重,揭示了该种在繁殖期前,随着个体发育,生活的水层深度逐渐变浅。
Through the analysis of stable oxygen and carbon isotopes of planktonic foraminifera in the sediment trap in the central South China Sea, the relationship between them and oceanographic parameters was discussed. The results showed that both δ18O value and δ13C value of G.ruber were lower than those of G.sacculifer; the δ18O difference (Δδ18O) between the two was 0.520 ‰ and that of δ13C (Δδ13C) was 0.544 ‰, which proved that G.ruber The depth of life (about 30m) is shallower than G.sacculifer’s (about 50m). The Δδ18O between G.ruber and G..sacculifer shows the feature of summer big and small winter, which may be related to the vertical temperature gradient of seawater in summer. The δ13C of G.ruber larvae was lighter than that of adult individuals, and the δ18O of larvae was heavier than that of adult individuals, revealing that the aquatic depth of the species gradually became shallow with the development of individuals before the breeding season.