The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought
Grasslands cover approximately one-fourth of the land in the world and play a crucial role in the carbon cycle. Therefore, quantifying the gross primary productivity (GPP) of grasslands is crucial to assess the sustainable development of terrestrial ecosystems. Drought is a widespread and damaging n...
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MDPI AG
2024-01-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/16/3/555 |
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| author | Wenhui Zhao Yuping Rong Yangzhen Zhou Yanrong Zhang Sheng Li Leizhen Liu |
| author_facet | Wenhui Zhao Yuping Rong Yangzhen Zhou Yanrong Zhang Sheng Li Leizhen Liu |
| author_sort | Wenhui Zhao |
| collection | DOAJ |
| description | Grasslands cover approximately one-fourth of the land in the world and play a crucial role in the carbon cycle. Therefore, quantifying the gross primary productivity (GPP) of grasslands is crucial to assess the sustainable development of terrestrial ecosystems. Drought is a widespread and damaging natural disaster worldwide, which introduces uncertainties in estimating GPP. Solar-induced chlorophyll fluorescence (SIF) is considered as an effective indicator of vegetation photosynthesis and provides new opportunities for monitoring vegetation growth under drought conditions. In this study, using downscaled GOME-2 SIF satellite products and focusing on the drought event in the Xilingol grasslands in 2009, the ability of SIF to evaluate the variations in GPP due to drought was explored. The results showed that the anomalies of SIF in July–August exhibited spatiotemporal characteristics similar to drought indicators, indicating the capability of SIF in monitoring drought. Moreover, the determination coefficient (R<sup>2</sup>) between SIF and GPP reached 0.95, indicating that SIF is a good indicator for estimating GPP. Particularly under drought conditions, the relationship between SIF and GPP (R<sup>2</sup> = 0.90) was significantly higher than NDVI and GPP (R<sup>2</sup> = 0.62), demonstrating the superior capability of SIF in tracking changes in grassland photosynthesis caused by drought compared to NDVI. Drought reduces the ability of NDVI to monitor GPP but does not affect that of SIF to monitor GPP. Our study provides a new approach for accurately estimating changes in GPP under drought conditions and is of significant importance for assessing the carbon dynamics of ecosystems. |
| first_indexed | 2024-03-08T03:49:47Z |
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| id | doaj.art-64491e0acddf4da4b78ce9dc304424b3 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-08T03:49:47Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-64491e0acddf4da4b78ce9dc304424b32024-02-09T15:21:28ZengMDPI AGRemote Sensing2072-42922024-01-0116355510.3390/rs16030555The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of DroughtWenhui Zhao0Yuping Rong1Yangzhen Zhou2Yanrong Zhang3Sheng Li4Leizhen Liu5College of Grassland Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Grassland Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Grassland Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Grassland Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Grassland Science and Technology, China Agricultural University, Beijing 100193, ChinaCollege of Grassland Science and Technology, China Agricultural University, Beijing 100193, ChinaGrasslands cover approximately one-fourth of the land in the world and play a crucial role in the carbon cycle. Therefore, quantifying the gross primary productivity (GPP) of grasslands is crucial to assess the sustainable development of terrestrial ecosystems. Drought is a widespread and damaging natural disaster worldwide, which introduces uncertainties in estimating GPP. Solar-induced chlorophyll fluorescence (SIF) is considered as an effective indicator of vegetation photosynthesis and provides new opportunities for monitoring vegetation growth under drought conditions. In this study, using downscaled GOME-2 SIF satellite products and focusing on the drought event in the Xilingol grasslands in 2009, the ability of SIF to evaluate the variations in GPP due to drought was explored. The results showed that the anomalies of SIF in July–August exhibited spatiotemporal characteristics similar to drought indicators, indicating the capability of SIF in monitoring drought. Moreover, the determination coefficient (R<sup>2</sup>) between SIF and GPP reached 0.95, indicating that SIF is a good indicator for estimating GPP. Particularly under drought conditions, the relationship between SIF and GPP (R<sup>2</sup> = 0.90) was significantly higher than NDVI and GPP (R<sup>2</sup> = 0.62), demonstrating the superior capability of SIF in tracking changes in grassland photosynthesis caused by drought compared to NDVI. Drought reduces the ability of NDVI to monitor GPP but does not affect that of SIF to monitor GPP. Our study provides a new approach for accurately estimating changes in GPP under drought conditions and is of significant importance for assessing the carbon dynamics of ecosystems.https://www.mdpi.com/2072-4292/16/3/555solar-induced chlorophyll fluorescencevegetation indicesgross primary productiondroughtgrasslands |
| spellingShingle | Wenhui Zhao Yuping Rong Yangzhen Zhou Yanrong Zhang Sheng Li Leizhen Liu The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought Remote Sensing solar-induced chlorophyll fluorescence vegetation indices gross primary production drought grasslands |
| title | The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought |
| title_full | The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought |
| title_fullStr | The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought |
| title_full_unstemmed | The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought |
| title_short | The Relationship of Gross Primary Productivity with NDVI Rather than Solar-Induced Chlorophyll Fluorescence Is Weakened under the Stress of Drought |
| title_sort | relationship of gross primary productivity with ndvi rather than solar induced chlorophyll fluorescence is weakened under the stress of drought |
| topic | solar-induced chlorophyll fluorescence vegetation indices gross primary production drought grasslands |
| url | https://www.mdpi.com/2072-4292/16/3/555 |
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