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木材中的同位素凝聚作为树木中光透气的代理

Max K Lloyd^1,2, Rebekah A Stein^1,3, Daniel E Ibarra^1,4

¹Department of Earth and Planetary Science, University of California, Berkeley, CA 94720.

Proceedings of the National Academy of Sciences of the United States of America

|November 6, 2023

概括

研究人员开发了一种使用木质同位素测量光吸的新方法,光吸是一种限制植物生长的过程. 这种技术揭示了温度和二氧化碳如何影响植物的生产力,可以用来研究过去的气候.

科学领域:

植物生理学植物生理学
同位素地球化学同位素地球化学
古气候学古气候学

背景情况:

光透气显著影响陆地植物的初级生产率.
光透气的相对速度受温度和大气中的二氧化碳水平的影响.
在光吸速率的环境变化仍然不太了解.

研究的目的:

引入一种用于估计植物相对光吸速率的新型代理.
为了研究甲氧基团中的凝聚同位素与环境因素之间的关系.
分析光吸的全球趋势及其对植物生产力的影响.

主要方法:

使用木材中甲氧基 (R-OCH3) 的凝聚同位素组成作为代理.
分析了聚合同位素13CH2D的丰度,与温度和大气中的CO2相关.
将该方法应用于来自不同气候的木材样本的全球数据集.

主要成果:

在含水量充足的条件下,甲基中的聚合同位素组成与温度 (18-28 °C) 和大气二氧化碳 (280-1000 ppm) 相对应.
全球木材同位素数据显示了气候和水资源的明显趋势.
在~18°C以上,同位素成分在限水和充水树之间有所不同,这表明光吸管理差异.

结论:

聚集的同位素代理有效地反映了相对光吸速率及其环境驱动因素.
气候较热的树木表现出较高的光透气,水的可用性介导了代谢反应.
这项研究为重建过去的光透气提供了一个工具,并提供了在不断变化的气候条件下对未来植物生产力的见解.

关键词:

气候变化气候变化气候变化聚合的同位素聚集在一起.红色的线性蛋白质 (lignin) 是一种甲氧基组是甲氧基的组成部分.摄影呼吸是一种摄影呼吸.

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