在调节共生性固化的过程中存在时间滞后
Thomas A Bytnerowicz1,2, Kevin L Griffin1,3, Duncan N L Menge1
1Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY, 10027, USA.
The New phytologist
|June 12, 2025
概括
对交生固定 (SNF) 调节的时间滞后被测量在N-固定树中. 在温带物种和温暖的条件下,反应更快,影响生态系统的气可用性.
科学领域:
- 生态生态学 生态生态学
- 植物生物学 植物生物学
- 生物地质化学生物地质化学
背景情况:
- 对交生固定 (SNF) 调节的时间滞后在理论上对N固定树很重要,但缺乏经验测量.
- 了解这些监管延迟对于预测N固定物种的竞争动态和生态系统后果至关重要.
研究的目的:
- 量化与N-固定树苗中SNF下调和上调相关的时间滞后.
- 调查这些时间滞后如何在不同物种起源 (热带与温带) 和共生关联 (actinorhizal与根茎生物) 之间变化.
- 评估温度调节 (温暖与寒冷) 对SNF调节时间滞后的影响.
主要方法:
- 采用一种新的方法,在受控温度条件下测量四种N固定树种的苗木中的SNF.
- 将添加到N-贫乏条件中诱导了SNF下调,而从N-丰富条件中去除N则诱导了上调.
- 测量追踪了SNF达到95%变化所需的时间,以及在上调期间可检测的SNF的出现.
主要成果:
- 在温带物种和温暖的温度下,SNF的下调到95%的下降需要31-51天,在温带物种和温暖的温度下观察到更快的速度.
- 升调到95%的增长需要108-138天,可检测的开始延迟为21-57天.
- 树生物共生早些时候启动了SNF,而actinorhizal共生一旦启动,则显示出更快的增加.
结论:
- 在SNF调节中的时间滞后显著限制了选择性共生固定.
- 这些监管延迟可能会导致生态系统的可用的大量损失,这可能解释了尽管有N固定投入,但持续的N丰富性.
- 这些发现突显了森林生态系统中SNF调节动态的生态意义.
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