Carbon isotopic records in paleosols over the Pliocene in Northern China: Implication on vegetation development and Tibetan uplift
Carbon isotopic records in paleosols over the Pliocene in Northern China: Implication on vegetation development and Tibetan uplift
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DOI：
10.1360/02tb9156
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发表时间：
2002-04
影响因子：
--
通讯作者：
Wenying Jiang;Shuzhen Peng;Q. Hao;Tung-sheng Liu
中科院分区：
文献类型：
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作者：
Wenying Jiang;Shuzhen Peng;Q. Hao;Tung-sheng Liu
成土碳酸盐岩的碳同位素组成可以用来估算C4和C3植物的比例。本文报道了黄土高原中部西峰红壤剖面碳酸盐岩的碳同位素数据。结果表明，C4植被在1.44Ma B.P.黄土高原地区C4植物的扩张特征和时间与巴基斯坦、非洲等地相似，表明区域气候变化是C4植物扩张的主要驱动因素。这一事件与西峰粒度和北太平洋风尘记录所证明的干旱增加的时间相当。因此，我们认为，上新世中国北方C4植物的扩张可能是由于干旱的增加，而这可能与青藏高原的快速隆升有关。
Carbon isotopic composition of pedogenic carbonate can be used to estimate the proportion of C4 and C3 plants. Here we present carbon isotopic data of carbonate in a red earth section at Xifeng, central Loess Plateau. Results show that C4 vegetation increased in ∼4.4 Ma B.P., stabilized between 4.0 and 3.0 Ma B.P. The character and timing of C4 expansion on the Loess Plateau are similar, but different with other localities, e.g. Pakistan and Africa, implying that regional climate changes were main factors driving the expansion of C4 plants. This event is comparable in timing with increased aridity evidenced by Xifeng grain size and North Pacific eolian dust records. Therefore we argue that the Pliocene expansion of C4 plants in northern China might have been caused by the increased aridity, which in turn might be related to rapid uplift of the Tibetan Plateau.