Vegetation-climate interactions among native and invasive species in Hawaiian rainforest
Vegetation-climate interactions among native and invasive species in Hawaiian rainforest
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DOI：
10.1007/s10021-006-0124-z
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发表时间：
2006-11-01
期刊：
影响因子：
3.7
通讯作者：
Vitousek, Peter M.
中科院分区：
文献类型：
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作者：
Asner, Gregory P.;Martin, Roberta E.;Vitousek, Peter M.
我们编制了一个时间序列的地球观测-1（Earth Observing-1）卫星观测与实地测量，以比较夏威夷山地雨林中入侵固氮树杨梅和本地Metrosideros polymorpha的结构，生化和生理特征。基于卫星的冠层水分测量密切跟踪叶面积指数的变化，遥感光化学和类胡萝卜素反射指数（PRI，CRI）表明在气候转变期间，冠层上部叶片叶绿素和类胡萝卜素含量的变化。PRI和CRI与每个物种的光能利用效率的差异有关，如叶电子传递速率的田间测量所示。该套件的高光谱指标表明，杨梅和Metrosideros的结构，生物化学和生理的最大差异时，冠层蒸汽压赤字高，在炎热和干燥的时期。这些卫星数据，结合克雷格-埃姆斯-斯坦福大学方法（CASA）碳循环模型，表明杨梅的生长率比Metrosideros高16-44%，物种之间的相对差异与气候条件密切相关。卫星高光谱数据确定了有利于引进树木扩散的基本生物机制，并提供了关于植被-气候相互作用如何影响植物生长在入侵过程中的时间进程的更详细的了解。
We compiled a time series of Earth Observing-1 Hyperion satellite observations with field measurements to compare the structural, biochemical, and physiological characteristics of an invasive nitrogen-fixing tree Myrica faya and native Metrosideros polymorpha in montane rainforests in Hawai'i. Satellite-based canopy water measurements closely tracked variations in leaf area index, and the remotely sensed photochemical and carotenoid reflectance indices (PRI, CRI) indicated variations in upper-canopy leaf chlorophyll and carotenoid content during a climatological transition. The PRI and CRI were related to differences in light-use efficiency of each species, as indicated by field measurements of leaf electron transport rate. The suite of hyperspectral metrics indicated maximum differences in the structure, biochemistry, and physiology of Myrica and Metrosideros when canopy vapor pressure deficit was high during hotter and drier periods. These satellite data, combined with the Carnegue-Ames-Stanford Approach (CASA) carbon cycle model, suggested that Myrica growth rates were 16-44% higher than Metrosideros, with relative differences between species closely linked to climate conditions. The satellite hyperspectral data identified the basic biological mechanisms favoring the spread of an introduced tree, and provided a more detailed understanding of how vegetation-climate interactions affect the time course of plant growth with respect to the invasion process.