Detection of vegetation canopy stress dynamics using integrated near-ground, and airborne remote sensing data over coastal and boreal forests

利用沿海和北方森林的综合近地和机载遥感数据检测植被冠层应力动态

• 批准号: 311926-2008
• 负责人: Coops, Nicholas
• 金额: $ 2.29万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=497084
• 关键词: Detection; vegetation; canopy; stress; dynamics

Monitoring of plant photosynthesis is a critical component to understanding the terrestrial carbon cycle, and requires a detailed understanding of the vegetated land surface. Remote sensing is the ideal technology to observe vegetation characteristics in a spatially continuous mode, however variations in vegetation growth over space and time, requires additional information on soil water and nutrient status and climate. This research program will develop functional relationships between vegetation reflectance (indicative of vegetation functioning), plant light use efficiency (Rue) and coincident measurements of carbon and water fluxes. Our approach focuses on the determination and monitoring of Rue using the remote sensing derived photochemical reflectance index (PRI, (based on canopy reflectance at 531 and 570 nm) and other spectral indices. Modeling Rue at the canopy scale is not straightforward, as PRI is a function of both directional reflectance and plant physiological status. To address these complexities, we have designed and built an innovative, tower-mounted sensor (AMSPEC) which scans the top of the canopy to record changes, every 15 seconds, in leaf functioning.

植物光合作用的监测是了解陆地碳循环的关键组成部分，需要详细了解植被表面。遥感是以空间连续模式观察植被特征的理想技术，然而植被生长随空间和时间的变化需要有关土壤水和养分状况以及气候的额外信息。该研究计划将开发植被反射率（指示植被功能）、植物光利用效率（Rue）以及碳和水通量的同时测量之间的函数关系。我们的方法侧重于使用遥感衍生的光化学反射指数 (PRI，基于 531 和 570 nm 的冠层反射率) 和其他光谱指数来确定和监测 Rue。在冠层尺度上模拟 Rue 并不简单，因为 PRI 是为了解决这些复杂性，我们设计并制造了一种创新的塔式传感器 (AMSPEC)，它可以扫描树冠顶部以进行记录。叶子功能每 15 秒就会发生变化。