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重建的二氧化碳度对使用叶子气交换模型的口腔制备方法的灵敏度

Michael D Machesky^1,2, Nathan D Sheldon¹, Michael T Hren³

¹Department of Earth and Environmental Sciences University of Michigan 1100 N. University Ave. Ann Arbor 48109 Michigan USA.

Applications in plant sciences

|February 5, 2025

概括

使用叶子特征重建过去的大气二氧化碳 (CO2) 水平至关重要. 这项研究发现,不同的叶子制备方法不会显著影响二氧化碳估计,尽管碳同位素分离需要进一步调查.

科学领域:

古气候学古气候学
古植物学是古植物学.
地质化学地质化学

背景情况:

使用口腔特征和叶子碳同位素比率的机械模型对于重建Phanerozoic大气二氧化碳 (CO2) 度至关重要.
目前缺乏准备叶子皮质以测量口腔特征的标准化方法,这阻碍了准确的古气候重建.

研究的目的:

评估四种不同的叶子制备方法对口腔特征测量的影响.
评估这些方法对古CO2度重建的准确性的影响.
调查碳同位素分离在古CO2估计中的作用.

主要方法:

胃口密度,胃口指数,护卫细胞长度,护卫细胞对宽度和毛孔长度都是在*Ginkgo biloba*,*Quercus alba*和*Zingiber mioga*的叶子上进行测量.
采用了四种制备方法:清除的叶子上的光,指甲油,新鲜的叶子上的牙膏,干燥的叶子上的牙膏.
从已知的二氧化碳度下种植的植物中采集了叶子样本.

主要成果:

在四种制备方法的各个口腔特征测量中观察到显著差异.
与单个特征测量相比,模拟的古 CO2 计算对制备方法的敏感性较小.
假设碳同位素分成的选择显著影响了古 CO2 结果的准确性.

结论:

在任何四种经过测试的叶子制备方法中,从任何四种经过测试的叶子制备方法中得出的古 CO2 估计中没有发现显著差异.
为了准确的古CO2气流量计,需要对因二酸盐 (RuBP) 碳氧化而产生的物种特异分化进行进一步的研究.
建议使用多个观察者进行形态测量,以最大限度地减少观测偏差,并建议对广泛应用的种类,如 * Ginkgo *.

关键词:

银杏 (Ginkgo) 是一种植物.科尔库斯 (Quercus Quercus) 是一个植物.辛加贝尔 (Zingiber) 是一种纤维.古植物学是古植物学.古代气候是一种古气候.稳定的同位素是稳定的.胃的胃,就是胃.

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