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升高的CO2对成熟树木的高光谱叶反射率的影响
Anna Lee Jones1,2, Anna Gardner3,4, Felicity Hayes5
1Department of Biology, University of Oxford, South Parks Road, Oxford, OX1 3SZ UK.
概括
经过实验增加的二氧化碳 (CO2) 不会改变成熟树的整体叶子反射率. 然而,它增加了植物衰老反射指数 (PSRI),表明了变化的色素比率.
科学领域:
- 林业林业 林业 林业 林业
- 植物生理学 植物生理学
- 遥感 遥感 遥感 遥感
背景情况:
- 大气二氧化碳度的上升 (预计到2050年将达到550 ppm) 可能会影响森林生态系统.
- 增加的二氧化碳 (eCO2) 预计将影响森林生产力,水资源关系和现象学.
- 对于eCO2对成熟森林叶子反射率的影响尚不清楚,但对于辐射转移和遥感至关重要.
研究的目的:
- 为了研究7年的eCO2暴露对成熟Quercus robur L.树的高光谱叶反射率的影响.
- 评估森林生态系统中叶子层面对eCO2的生理和现象反应的变化.
主要方法:
- 使用了伯明翰森林研究所 (BIFoR) 的自由空气二氧化碳丰富 (FACE) 实验.
- 在环境和eCO2条件下测量了180岁的Quercus robur L.树的高光谱叶反射强度.
主要成果:
- 在环境处理和eCO2处理之间,Quercus robur L.的整体叶子反射率没有显著差异.
- 植物衰老反射指数 (PSRI) 在eCO2.0下显著更高.
- 标志着叶子叶叶绿素与胡卜素颜料的比率的变化.
结论:
- 成熟的Quercus robur L.在未来的CO2条件下,叶子反射率不太可能在整体光谱特性中显著变化.
- 升高的二氧化碳会改变叶子颜料的相对含量,影响特定波长反射率.
- 这些发现提供了关于成熟树木对二氧化碳升高的叶子水平反应的见解.
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