增加的二氧化碳在农林生态系统中将增长与异二烯排放分开
Todd N Rosenstiel1, Mark J Potosnak, Kevin L Griffin
1Department of Environmental, Population, and Organismic Biology, University of Colorado, Boulder, Colorado 80309, USA. todd.rosenstiel@colorado.edu
Nature
|January 17, 2003
概括
大气中二氧化碳的增加大大减少了树种植园的异二烯排放量,将其与生物质增长脱. 这一发现表明,二氧化碳水平的上升可能会抵消扩大农林带来的负面空气质量影响.
科学领域:
- 生物地质化学生物地质化学
- 植物生理学 植物生理学
- 大气化学 大气化学
背景情况:
- 树木的异二烯排放是生物圈-大气相互作用和大气光化学的关键.
- 农林种植可以增加臭氧污染和甲寿命,影响气候.
- 了解环境因素如何影响异烯生产对于气候和空气质量建模至关重要.
研究的目的:
- 调查二氧化碳 (CO2) 增加对异烯排放和生物质积累在Populus deltoides种植园中的影响.
- 阐明导致二氧化碳升高的情况下异烯生产变化的潜在生理机制.
主要方法:
- 在两个高二氧化碳度 (800和1200微摩尔mol-1) 下,一个完整的Populus deltoides种植园的生长.
- 测量生态系统的异烯生产和地表生物质.
- 对叶子和叶子原质体中二甲基亚酸 (DMAPP) 含量的分析.
- 确定异烯合成的潜在代谢控制点.
主要成果:
- 升高的二氧化碳 (800和1200微molmol−1) 分别减少了21%和41%的生态系统异烯产量.
- 在高二氧化碳条件下,地表生物质积累量分别增加了60%和82%.
- 增加的CO2显著降低了细胞中的DMAPP含量,这是异烯合成的基质.
- 作为一种潜在的调节机制,鉴定了基酸的细胞内代谢竞争.
结论:
- 升高的二氧化碳分离了来自Populus deltoides生物质积累的异二烯排放.
- 增加的二氧化碳可以减轻与农林扩张相关的负面空气质量影响.
- 这些发现对预测未来二氧化碳情景下的区域空气质量和气候反有影响.
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