Remote sensing of photosynthetic light-use efficiency across two forested biomes: Spatial scaling
Remote sensing of photosynthetic light-use efficiency across two forested biomes: Spatial scaling
复制标题
DOI：
10.1016/j.rse.2010.07.004
复制
发表时间：
2010-12-15
影响因子：
13.5
通讯作者：
Chasmer, Laura
中科院分区：
文献类型：
--
作者：
Hilker, Thomas;Hall, Forrest G.;Chasmer, Laura
涡动相关（EC）测量大大提高了我们对陆地生态系统碳交换的认识。然而，需要适当的技术来扩大这些空间离散的调查结果在全球范围内。卫星遥感在这方面提供了独特的机会，但对初级生产总值的关键组成部分之一-光合光利用效率进行遥感是一项挑战。近年来，使用光化学反射指数取得了一些进展，这是一种以531和570 nm为中心的窄波段指数。这个指数的高灵敏度，各种外来的影响，如冠层结构，和视图观察员的几何形状，到目前为止，阻止其使用在景观和全球尺度。提升PRI的一个关键方面是开发通用算法来解释植被的结构差异。在以前的工作的基础上，本研究比较了PRI的差异：位于温哥华岛，不列颠哥伦比亚省，和一个成熟的白杨站位于加拿大萨斯喀彻温省中部的沿海道格拉斯冷杉林之间的关系。利用安装在每个站点的自动多角度光谱辐射计（AMSPEC II）获得的连续塔式观测数据，我们证明PRI可以用于测量DF-49站整个植被季节的植被覆盖度（r（2）= 0.91，p
Eddy covariance (EC) measurements have greatly advanced our knowledge of carbon exchange in terrestrial ecosystems. However, appropriate techniques are required to upscale these spatially discrete findings globally. Satellite remote sensing provides unique opportunities in this respect, but remote sensing of the photosynthetic light-use efficiency (epsilon), one of the key components of Gross Primary Production, is challenging. Some progress has been made in recent years using the photochemical reflectance index, a narrow waveband index centered at 531 and 570 nm. The high sensitivity of this index to various extraneous effects such as canopy structure, and the view observer geometry has so far prevented its use at landscape and global scales. One critical aspect of upscaling PRI is the development of generic algorithms to account for structural differences in vegetation. Building on previous work, this study compares the differences in the PRI: epsilon relationship between a coastal Douglas-fir forest located on Vancouver Island, British Columbia, and a mature Aspen stand located in central Saskatchewan, Canada. Using continuous, tower-based observations acquired from an automated multi-angular spectro-radiometer (AMSPEC II) installed at each site, we demonstrate that PRI can be used to measure epsilon throughout the vegetation season at the DF-49 stand (r(2)= 0.91, p