在春季叶子冲洗和脱叶后的生长期间,追踪碳和储备的重新调动和脱叶后的生长
Ashley T Hart1, Simon M Landhäusser1, Erin Wiley2
1Department of Renewable Resources, University of Alberta, Edmonton, AB, T6G 2R3, Canada.
Tree physiology
|January 28, 2024
概括
木质植物利用储存的碳和储备进行生长. 青树苗表明,根储备优先考虑附近的叶子,在脱叶后不太依赖储备.
科学领域:
- 植物生理学 植物生理学
- 森林生态 森林生态
- 生物化学 生物化学
背景情况:
- 在高需求或压力时期,木质植物利用储存的碳 (C) 和 (N) 储备进行生长.
- 了解这些储量的调节以及组织邻近对重新调动的影响,对于预测植物反应至关重要.
- 关于重新调动储备的具体来源和分配模式,目前存在知识差距.
研究的目的:
- 调查青树苗中重新调动的碳和储量的来源和分配.
- 为了确定源和下沉组织之间的距离如何影响储备重新动员.
- 检查春季冲洗和脱叶后储备使用的空间和时间变化.
主要方法:
- 青树苗是通过使用稳定同位素 (13C,15N) 和接种技术设计的,具有特定器官的标记储备.
- 对各种叶类型的根和茎衍生C和N储备进口量化.
- 他们比较了上方和下方的树冠叶,早期和晚期的叶子,以及春季冲洗与脱叶后重新冲洗的叶子.
主要成果:
- 在春季冲洗期间,根源来源的C和N储量优先分配给较低的树冠叶,靠近根源.
- 随着时间的推移,对碳储备的依赖减少了,这是季后叶子13C进口减少所表明的.
- 脱叶后,重新冲洗的叶子从根储量中获得了类似的N,但与春季冲洗相比,从根储量中获得的C更少,这表明它们对当前光合作用的依赖程度增加.
结论:
- 阿斯优先考虑维护根储备,而不是在脱叶后快速恢复树冠.
- 水槽与储备源的空间距离影响了C和N的分配.
- 干扰后的叶子重新冲洗更多地依赖于当前光合作用,当根储备C进口有限时.
关键词:
人口震物种 (populus tremuloides) 是一个有趣的物种.接种方式 接种方式标签 标签 标签 标签非结构性碳水化合物储存沉和源距离之间的距离.沉水槽和源头优先级.稳定的同位素是稳定的.更多相关视频
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