Qi, Yangqian and Zeng, Zhao-Cheng (2020) Weak Response of Vegetation Photosynthesis to Meteorological Droughts in Southwest China: Insights from Gome-2 Solar-Induced Fluorescence. In: 2020 IEEE International Geoscience and Remote Sensing Symposium. IEEE , Piscataway, NJ, pp. 4995-4998. ISBN 9781728163741. https://resolver.caltech.edu/CaltechAUTHORS:20210225-140105695
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Abstract
Drought stress threatens vegetation dynamics across diverse ecosystems. Monitoring how vegetation responds to water stress is vital for ecological conservation. The response of vegetation photosynthesis to water availability variations in Southwest China from 2008 to 2018 is investigated in this study. The solar-induced fluorescence (SIF) derived from GOME-2 is used to characterize photosynthetic changes. We examined the sensitivity of SIF anomaly to standardized precipitation-evapotranspiration index (SPEI) at multiple time scales to evaluate the drought impacts on different ecosystems (i.e. forests, croplands, grasslands, and shrublands). We find that (1) SIF has significant yet weak correlations to SPEI across major ecosystems in Southwest China; (2) Forests are more sensitive to short-term droughts in comparison with other ecosystems. (3) Cropland, grassland, and shrubland are more subjected to long-term droughts compared to forests. Our findings indicate that, in Southwest China, satellite SIF may not be effective in monitoring the impact of drought on vegetation due to its weak response to SPEI. The robustness of using satellite-observed SIF to assess drought's effects still needs to be further tested with high-resolution SIF data.
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| Additional Information: | © 2020 IEEE. We acknowledge the following datasets for this research: (1) MODIS land cover product, (2) GOME-2 SIF data on board the MetOp-A satellite, and (3) the SPEI data from the SPEI Global Drought Monitor. We also sincerely thank the support of Ms. Sacha Khoury from the University of Cambridge and the Integrated Remote Sensing Studio led by Professor Nicholas Coops from the University of British Columbia. | |||||||||
| Subject Keywords: | Drought monitoring, vegetation photosynthesis, solar-induced fluorescence, GOME-2 | |||||||||
| Record Number: | CaltechAUTHORS:20210225-140105695 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20210225-140105695 | |||||||||
| Official Citation: | Y. Qi and Z. -C. Zeng, "Weak Response of Vegetation Photosynthesis to Meteorological Droughts in Southwest China: Insights from Gome-2 Solar-Induced Fluorescence," IGARSS 2020 - 2020 IEEE International Geoscience and Remote Sensing Symposium, Waikoloa, HI, USA, 2020, pp. 4995-4998, doi: 10.1109/IGARSS39084.2020.9323788 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 108214 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 26 Feb 2021 00:30 | |||||||||
| Last Modified: | 26 Feb 2021 00:30 |
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