辐射和温度驱动来自苏格兰松树冠的有氧甲排放的日间变化
Lukas Kohl1,2,3, Salla A M Tenhovirta1,2, Markku Koskinen1,2
1Department of Agricultural Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Helsinki 00790, Finland.
概括
植物叶子会排放甲,甲是全球甲循环的关键部分,但人们对其了解甚少. 这项研究量化了来自苏格兰松树的甲流量,揭示了光和温度是这些排放的关键驱动因素.
科学领域:
- 环境科学 环境科学
- 生物地质化学生物地质化学
- 植物生理学 植物生理学
背景情况:
- 来自植物叶片的甲 (CH4) 排放越来越被认为对全球甲循环具有重要意义.
- 然而,这些排放的规模和源流程仍然不太清楚,特别是在北极森林等主要生物体中占主导地位的树种.
研究的目的:
- 为了量化来自苏格兰松树 (Pinus sylvestris) 树枝的甲流量.
- 确定这些甲排放的环境驱动因素和源流程.
- 评估生态系统层面流量测量 (带共变) 的潜力,以限制射线层面的排放.
主要方法:
- 在各种环境 (森林,花园,温室) 和树木类型 (成熟,幼苗) 中进行了射击级甲流量测量.
- 测量采用了手动和自动化室系统,可控制二氧化碳,温度和水蒸气.
- 采用多个甲分析仪,并使用旋共变技术评估常态水平流量.
主要成果:
- 在不同的测量条件下观察到一致的白天甲流量,范围从0.144 ± 0.019到0.375 ± 0.074 nmol CH4 g−1叶干重h−1.1.
- 排放呈现出明显的日间循环,与光合作用活性辐射密切相关,并受温度调节.
- 立场级甲流中的依赖光的组成部分与射击级测量一致,为射击排放提供了上限.
结论:
- 植物叶子,特别是苏格兰松树的芽,是可量化的甲排放来源.
- 光合作用相关的生物化学反应或由阳光驱动的光化学过程可能是这种甲的来源.
- 来自树枝的甲排放可以在生态系统层面检测,有助于了解全球甲预算.
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