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Improving the Monitoring of Crop Productivity Using Spaceborne Solar-Induced FluorescenceLarge-scale monitoring of crop growth and yield has important value for forecasting food production and prices and ensuring regional food security. A newly emerging satellite retrieval, solar-induced fluorescence (SIF) of chlorophyll, provides for the first time a direct measurement related to plant photosynthetic activity (i.e. electron transport rate). Here, we provide a framework to link SIF retrievals and crop yield, accounting for stoichiometry, photosynthetic pathways, and respiration losses. We apply this framework to estimate United States crop productivity for 2007-2012, where we use the spaceborne SIF retrievals from the Global Ozone Monitoring Experiment-2 satellite, benchmarked with county-level crop yield statistics, and compare it with various traditional crop monitoring approaches. We find that a SIF-based approach accounting for photosynthetic pathways (i.e. C3 and C4 crops) provides the best measure of crop productivity among these approaches, despite the fact that SIF sensors are not yet optimized for terrestrial applications. We further show that SIF provides the ability to infer the impacts of environmental stresses on autotrophic respiration and carbon-use-efficiency, with a substantial sensitivity of both to high temperatures. These results indicate new opportunities for improved mechanistic understanding of crop yield responses to climate variability and change.
Document ID
20170003341
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Guan, Kaiyu
(Stanford Univ. Stanford, CA, United States)
Berry, Joseph A.
(Carnegie Institution for Science Stanford, CA, United States)
Zhang, Yongguang
(GFZ German Research Centre for Geosciences Potsdam, Germany)
Joiner, Joanna
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Guanter, Luis
(GFZ German Research Centre for Geosciences Potsdam, Germany)
Badgley, Grayson
(Carnegie Institution for Science Stanford, CA, United States)
Lobell, David B.
(Stanford Univ. Stanford, CA, United States)
Date Acquired
April 11, 2017
Publication Date
November 10, 2015
Publication Information
Publication: Global Change Biology
Volume: 22
Issue: 2
ISSN: 1354-1013
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN41459
Distribution Limits
Public
Copyright
Other
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