Remote sensing of solar induced fluorescence and the Photochemical Reflectance Index (PRI) for carbon uptake in two contrasting forest ecosystem types

两种对比森林生态系统类型中碳吸收的太阳诱导荧光遥感和光化学反射指数 (PRI)

• 批准号: NE/F017294/1
• 负责人: Caroline Nichol
• 金额: $ 52.94万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FF017294%2F1
• 关键词: Remote; sensing; solar; induced; fluorescence

The increase in concentration of carbon dioxide (CO2) in the atmosphere and its contribution to global warming is one of the most urgent of environmental issues. The rise in atmospheric CO2 has been principally ascribed to the burning of fossil fuels and tropical deforestation. Around 45% of the estimated emissions of CO2 are accounted for by the increase in atmospheric CO2, but the remainder is largely unaccounted for and it is believed that the terrestrial biosphere and the oceans are taking up the remainder. A number of scientific studies suggest that it is the vegetation that is primarily responsible for taking up this excess CO2, yet these estimates are uncertain, as well as an understanding of the processes that drive them. The aim of this work is to specifically improve estimates of the processes of photosynthesis, and stress (such as lack of water, and heat, for example) using remote sensing. The direct measurement of the photosynthetic CO2 exchange between the atmosphere and biosphere can be carried out by using advanced systems that include fast responding gas (CO2) analysers. Such systems are already installed globally in a network of over 200 sites and actively collect CO2 flux data over contrasting vegetation types. Whilst these measurements are powerful in that they provide continuous data on photosynthesis of large areas of vegetation, they only represent one point in space and we wish to utilise other methods, namely remote sensing, that can also provide this information yet measure over a much larger geographical area. In a nutshell, global issues with global impact, requires global measurement and this can only be achieved using remote sensing. Within our group we have successfully developed methods to detect changes in the photosynthetic reactions from remote sensing (from aircraft) but have only tested this is a select few ecosystem types. This therefore presents a unique and exciting opportunity to investigate the use of remote sensing for measuring photosynthesis such that we can move towards the reality of 'measuring biology from space', which would be a key breakthrough in photosynthesis research and advance our understanding of the role of vegetation in the terrestrial carbon cycle. This field is particularly exciting because it addresses fundamental scientific and political issues. The Intergovernmental Panel on Climte Change released its final synthesis report which highlighed not only the unequivocal evidence in support of climate warming, but also the impact this will have on terrestrial ecosystems. The proposal is therefore of high importance since it addresses the issue of carbon uptake by vegetation and how it will be affected by the stresses imposed by a changing climate.

大气中二氧化碳浓度的增加及其对全球变暖的贡献是最紧迫的环境问题之一。大气中二氧化碳的增加主要归因于燃烧化石燃料和热带森林砍伐。在估计的CO2排放量中，约有45%是由于大气CO2的增加，但其余部分基本上没有得到解释，据信陆地生物圈和海洋正在吸收其余部分。许多科学研究表明，植被是吸收过量二氧化碳的主要原因，但这些估计是不确定的，对驱动它们的过程也是不确定的。这项工作的目的是专门改进利用遥感对光合作用过程和压力（例如缺水和热量）的估计。直接测量大气和生物圈之间的光合作用CO2交换可以通过使用包括快速响应气体（CO2）分析仪的先进系统来进行。这种系统已经在全球200多个地点的网络中安装，并积极收集对比植被类型的二氧化碳通量数据。虽然这些测量是强大的，因为它们提供了大面积植被光合作用的连续数据，但它们只代表空间中的一个点，我们希望利用其他方法，即遥感，也可以提供这种信息，但可以在更大的地理区域进行测量。简而言之，具有全球影响的全球性问题需要进行全球测量，而这只能通过遥感来实现。在我们的团队中，我们已经成功地开发了通过遥感（从飞机上）检测光合反应变化的方法，但只测试了少数几种生态系统类型。因此，这提供了一个独特和令人兴奋的机会，调查使用遥感测量光合作用，使我们可以走向现实的“从空间测量生物学”，这将是光合作用研究的一个关键突破，并推进我们对植被在陆地碳循环中的作用的理解。这个领域特别令人兴奋，因为它解决了基本的科学和政治问题。政府间气候变化专门委员会发布了最终综合报告，该报告不仅强调了支持气候变暖的明确证据，还强调了这将对陆地生态系统产生的影响。因此，该提案非常重要，因为它涉及植被的碳吸收问题以及气候变化带来的压力将如何影响植被。

项目成果

Diurnal and Seasonal Solar Induced Chlorophyll Fluorescence and Photosynthesis in a Boreal Scots Pine Canopy

• DOI: 10.3390/rs11030273
• 发表时间: 2019-01
• 期刊: Remote. Sens.
• 作者: C. Nichol;G. Drolet;A. Porcar-Castell;T. Wade;Neus Sabater;E. Middleton;C. MacLellan;J. Levula;I. Mammarella;T. Vesala;J. Atherton

Using spectral chlorophyll fluorescence and the photochemical reflectance index to predict physiological dynamics

• DOI: 10.1016/j.rse.2015.12.036
• 发表时间: 2016-04-01
• 期刊: REMOTE SENSING OF ENVIRONMENT
• 影响因子: 13.5
• 作者: Atherton, J.;Nichol, C. J.;Porcar-Castell, A.
• 通讯作者: Porcar-Castell, A.

A temperature-controlled spectrometer system for continuous and unattended measurements of canopy spectral radiance and reflectance

• DOI: 10.1080/01431161.2014.882035
• 发表时间: 2014-03-04
• 期刊: INTERNATIONAL JOURNAL OF REMOTE SENSING
• 影响因子: 3.4
• 作者: Drolet, Guillaume;Wade, Tom;Vesala, Timo
• 通讯作者: Vesala, Timo

Detecting Inter-Annual Variations in the Phenology of Evergreen Conifers Using Long-Term MODIS Vegetation Index Time Series

• DOI: 10.3390/rs9010049
• 发表时间: 2017-01
• 期刊: Remote. Sens.
• 作者: Laura Ulsig;C. Nichol;K. Huemmrich;D. Landis;E. Middleton;A. Lyapustin;I. Mammarella;J. Levula;A. Porcar-Castell

The utility of MODIS-sPRI for investigating the photosynthetic light-use efficiency in a Mediterranean deciduous forest

MODIS-sPRI 用于调查地中海落叶林光合光利用效率的实用性

• DOI: 10.1080/01431161.2014.950762
• 发表时间: 2014
• 期刊: International Journal of Remote Sensing
• 影响因子: 3.4
• 作者: Guarini R