干旱增加了对根呼吸的碳分配,同时在青海杉苗木中保持储存
Weibin Li1,2, Yonghai Wang3, Yanjing Jiang1,2
1State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems; Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs; Engineering Research Center of Grassland Industry, Ministry of Education; College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China.
Journal of experimental botany
|August 19, 2025
概括
森林面临着干旱的威胁. 青海树优先考虑碳储存而不是生长,将更多的碳分配给根,以维持干旱期间的呼吸.
科学领域:
- 森林生态学和生态生理学
- 植物碳分配战略 植物碳分配策略
- 干旱压力对树木的反应.
背景情况:
- 全球森林面临着日益严重的干旱,影响了它们的性和生存.
- 了解干旱下的树木碳分配至关重要,但有限.
- 增长,呼吸和储存之间的碳 (C) 分配权衡是关键.
研究的目的:
- 调查干旱对青海杉的碳分配权衡的影响.
- 为了确定最近同化碳是如何分配在干旱下的树区和土壤.
- 阐明非结构性碳水化合物 (NSC) 储备在水应激期间的作用.
主要方法:
- 使用13CO2脉冲标记技术来追踪碳分配.
- 在11天的时间内,测量了碳分配与呼吸,树和土壤的比例.
- 干旱对净光合作用率,生物质,根呼吸和NSC水平的评估影响.
主要成果:
- 干旱减少了净光合作用和叶子生物量,但增加了根呼吸.
- 非结构性碳水化合物储量保持稳定,表明存在保护战略.
- 更高比例的碳被分配给干旱下的根,以支持增加呼吸.
结论:
- 青海杉苗在干旱期间表现出保守的碳分配策略.
- 通过抑制增长来实现NSC存储的优先级.
- 相对的碳分配向根部转移,以在水应激期间维持呼吸.
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