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以角质层保存完好的4种银杏类化石为研究对象,通过对叶片角质层气孔参数的详细统计分析,利用气孔指数法和气孔比率法,定量重建了该区中侏罗世阿林期一巴柔期古大气φ(CO_2).结果显示:通过气孔指数法获得的狭叶拟刺葵、西伯利亚似银杏、敏斯特里拜拉(相似种)、东北拜拉大气妒(CO_2)均落在GEOCARBⅢ可信误差范围之外,而气孔比率法获得的狭叶拟刺葵、西伯利亚似银杏、敏斯特里拜拉(相似种)、东北拜拉大气φ(CO_2)均落在GEOCARBⅢ可信误差范围之内.说明对于恢复侏罗纪的大气φ(CO_2)气孔比率法更加可靠.由气孔比率法所得的古大气φ(CO_2)中,西伯利亚似银杏所得结果最接近最佳拟合线,其次是狭叶拟刺葵,拜拉属植物所得结果较低.表明似银杏属植物化石获得的古大气φ(CO_2)更加准确.最后确定出内蒙古准格尔旗西南部中侏罗世阿林期-巴柔期的φ(CO_2)为1.413×10~(-3).
Based on the detailed statistical analysis of stomatal parameters of stratum corneum, four stratum ginkgo fossils preserved in the stratum corneum were used to quantitatively reconstruct the Middle Jurassic Albin Iba The results show that: Gossypium avenae, Siberian ginkgo, Minster Riviera (similar species) and northeast Bora atmosphere (CO_2) all fall on GEOCARBⅢ, but the stomatal ratio obtained from the aerial part of Pseudocercus japonicus, Siberian ginkgo, Minster Riviera (similar species) and northeast Bora atmosphere φ (CO_2) all fell within the GEOCARB III confidence error , Indicating that it is more reliable for restoring the Jurassic atmosphere φ (CO 2) stomatal ratio method. Among the ancient atmosphere φ (CO 2) obtained by the stomatal ratio method, the results obtained by Siberian ginkgo closest to the best fitted line, followed by Is the narrow-leaf fagaceae, the lower result of the genus Baira shows that the Gossypium fossil obtained ancient atmosphere φ (CO_2) is more accurate.Finally identified in the southwestern Junggar in Inner Mongolia, the Middle Jurassic Albin period The φ (CO_2) of Banjo period is 1.413 × 10 ~ (-3 ).