Altitudinal variation in Ginkgo leaf characters: Clues to paleoelevation reconstruction
Altitudinal variation in Ginkgo leaf characters: Clues to paleoelevation reconstruction
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DOI：
10.1007/s11430-009-0157-1
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发表时间：
2009-12
期刊：
影响因子：
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通讯作者：
S. Xie;Bainian Sun;De-Fei Yan;Baoxia Du
中科院分区：
文献类型：
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作者：
S. Xie;Bainian Sun;De-Fei Yan;Baoxia Du
通过对银杏叶面积、叶形指数、叶柄长度、气孔密度、气孔指数、碳同位素分辨率等指标的详细研究，分析了这些参数随海拔梯度的变化趋势以及阳生叶和阴生叶的差异。结果表明，叶面积、叶柄长度和气孔参数与海拔高度没有明显的线性关系，但碳同位素分辨率与海拔高度呈负相关，具有作为古海拔高度计的潜力。结果还表明，气孔密度和气孔指数的阳、阴叶之间的差异对古高程重建的影响更大的比其他参数。根据碳同位素分辨率与海拔高度的线性和非线性相关关系，估算了兰州窑街盆地中侏罗世的古海拔演化。结果表明，窑街盆地的古高程在中侏罗世从阿伦期到早巴若期再到晚巴若期呈现先上升后下降的变化趋势。
After detailed studies of leaf area, leaf shape index, petiole length, stomatal density, stomatal index, and carbon isotope discrimination of Ginkgo biloba L., growing in Northwest China, the change trends of these parameters with an altitude gradient and their differences between sun and shade leaves were assessed. The results show that leaf area, petiole length, and stomatal parameters have no obvious linear relationship with altitude, but the carbon isotope discrimination shows a negative correlation with altitude, which has a potential to be an applicable paleo-altimeter. The results also suggest that the differences in stomatal density and stomatal index between sun and shade leaves had more influence on paleoelevation reconstruction than that in other parameters. Based on the linear and nonlinear correlations between carbon isotope discrimination and altitude, the paleoelevation evolution during the Middle Jurassic of the Yaojie Basin, Lanzhou in Gansu Province was estimated. The results show that the paleoelevation of the Yaojie Basin increased at first, and then decreased from the Aalenian to the early Bajocian and then to the late Bajocian in the Middle Jurassic.