Global and time-resolved monitoring of crop photosynthesis with chlorophyll fluorescence
2014
Guanter, Luis | Zhang, Yongguang | Jung, Martin | Joiner, Joanna | Voigt, Maximilian | Berry, Joseph A. | Frankenberg, Christian | Huete, Alfredo R. | Zarco-Tejada, Pablo | Lee, Jung-Eun | Moran, M. Susan | Ponce-Campos, Guillermo | Beer, Christian | Camps-Valls, Gustavo | Buchmann, Nina | Gianelle, Damiano | Klumpp, Katja | Cescatti, Alessandro | Baker, John M. | Griffis, Timothy J. | Free University of Berlin (FU) | Max Planck Institute for Biogeochemistry (MPI-BGC) ; Max-Planck-Gesellschaft | National Aeronautics and Space Administration (NASA) | Department of Global Ecology ; Carnegie Institution for Science | Jet Propulsion Laboratory (JPL) ; NASA-California Institute of Technology (CALTECH) | Plant Functional Biology and Climate Change Cluster (C3) ; University of Technology Sydney (UTS) | Instituto de Agricultura Sostenible - Institute for Sustainable Agriculture (IAS CSIC) ; Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] (CSIC) | Geological Sciences ; Brown University | United States Department of Agriculture (USDA) | Stockholm University | Image Processing Laboratory (IPL) ; Universitat de València = University of Valencia (UV) | Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich) | Fondazione Edmund Mach - Edmund Mach Foundation [Italie] (FEM) | Unité de recherche sur l'Ecosystème Prairial (UREP) ; Institut National de la Recherche Agronomique (INRA) | European Commission | Department of Soil, Water and Climate ; University of Minnesota System (UMN) | German Research Foundation; National Aeronautics and Space Administration (NASA) [NNH10DA001N]; NASA Soil Moisture Active Passive Science Definition Team [08-SMAPSDT08-0042]; W. M. Keck Foundation
International audience
اظهر المزيد [+] اقل [-]إنجليزي. Photosynthesis is the process by which plants harvest sunlight to produce sugars from carbon dioxide and water. It is the primary source of energy for all life on Earth; hence it is important to understand how this process responds to climate change and human impact. However, model-based estimates of gross primary production (GPP, output from photosynthesis) are highly uncertain, in particular over heavily managed agricultural areas. Recent advances in spectroscopy enable the space-based monitoring of sun-induced chlorophyll fluorescence (SIF) from terrestrial plants. Here we demonstrate that spaceborne SIF retrievals provide a direct measure of the GPP of cropland and grassland ecosystems. Such a strong link with crop photosynthesis is not evident for traditional remotely sensed vegetation indices, nor for more complex carbon cycle models. We use SIF observations to provide a global perspective on agricultural productivity. Our SIF-based crop GPP estimates are 50-75% higher than results from state-of-the-art carbon cycle models over, for example, the US Corn Belt and the Indo-Gangetic Plain, implying that current models severely underestimate the role of management. Our results indicate that SIF data can help us improve our global models for more accurate projections of agricultural productivity and climate impact on crop yields. Extension of our approach to other ecosystems, along with increased observational capabilities for SIF in the near future, holds the prospect of reducing uncertainties in the modeling of the current and future carbon cycle.
اظهر المزيد [+] اقل [-]المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique