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以雅鲁藏布大峡谷的羚牛为主要研究对象,讨论其牙齿珐琅质羟基磷灰石结构碳酸盐的碳、氧同位素组成与生活环境之间的关系。羚牛牙齿的碳同位素组成分布范围相当宽,且随着栖息地海拔高度的增加而变重,反映了食谱中C4植物从无到有、由少到多的变化趋势。C4植物含量最高可能达到70%。这一变化与当地自然带的划分相吻合。羚牛牙齿珐琅质结构碳酸盐的δ18O值分布范围较窄,与海拔高度之间没有明显的相关性。氧同位素分馏可能与水源和物种均有关。
The main research object is takin in the Brahmaputra Grand Canyon. The relationship between the carbon and oxygen isotopic compositions of the enamel hydroxyapatite structural carbonates and their living environment is discussed. The range of carbon isotopic composition of takin teeth is fairly wide, and it becomes heavier with the increase of the altitude of habitats, which reflects the tendency of C4 plants from scratch to change from less to more. C4 plant content up to 70%. This change is consistent with the division of the local natural belt. The range of δ18O values of the enamel structure carbonate of the Takin Teeth was narrow, and there was no obvious correlation with altitude. Oxygen isotope fractionation may be related to both water sources and species.