Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands
Atmospheric vapor pressure deficit (VPD, indicative of atmospheric water conditions) has been identified as a major driver of global vegetation dynamics. Drylands, including deserts, temperate grasslands, savannas, and dry forests, are more sensitive to water conditions and affect carbon, nitrogen,...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-04-01
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| Series: | Frontiers in Forests and Global Change |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/ffgc.2023.1164347/full |
| _version_ | 1827762529405763584 |
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| author | Rihong Wen Peng Jiang Peng Jiang Meiou Qin Qingyu Jia Nan Cong Xiaoying Wang Ying Meng Feiyun Yang Bin Liu Mengyuan Zhu Jiaxing Zu Ning Chen |
| author_facet | Rihong Wen Peng Jiang Peng Jiang Meiou Qin Qingyu Jia Nan Cong Xiaoying Wang Ying Meng Feiyun Yang Bin Liu Mengyuan Zhu Jiaxing Zu Ning Chen |
| author_sort | Rihong Wen |
| collection | DOAJ |
| description | Atmospheric vapor pressure deficit (VPD, indicative of atmospheric water conditions) has been identified as a major driver of global vegetation dynamics. Drylands, including deserts, temperate grasslands, savannas, and dry forests, are more sensitive to water conditions and affect carbon, nitrogen, and water cycles. However, our knowledge is limited on the way increasing VPD affects vegetation growth and evapotranspiration (ET) in global drylands. In this study, we used long-term satellite datasets combined with multiple statistical analyses to examine the relationship between the satellite-derived normalized difference vegetation index (NDVI), a proxy for vegetation growth, and ET to VPD across global drylands. We found that significant decreases in NDVI and ET predominantly influenced the NDVI (RVPD − NDVI) and ET (RVPD − ET) responses to VPD in both the savannas and dry forests of South American, African, and Australian savannas and dry forests, as well as in temperate grasslands (e.g., Eurasian steppes and American prairies). Notably, more than 60% of global drylands exhibited significantly negative RVPD − NDVI and RVPD − ET values. In contrast, the percentage of significantly negative RVPD − NDVI and RVPD − ET decreased to <10% in cold drylands (>60° N). In predominantly warm drylands (60° N~60° S), negative VPD effects were significantly and positively regulated by soil water availability, as determined by multiple linear regression models. However, these significant regulatory effects were not observed in cold drylands. Moving-window analyses further revealed that temporal changes in RVPD − NDVI and RVPD − ET were positively correlated with changes in the Standardized Precipitation Evapotranspiration Index (SPEI). In warm drylands, areas with increasing RVPD − NDVI and RVPD − ET over time showed an increasing trend in the SPEI, whereas areas with a decreasing SPEI showed a negative trend in RVPD − NDVI and RVPD − ET values over time. Given the increasing atmospheric dryness due to climate change, this study highlighted the importance of re-evaluating the representation of the role of water availability in driving the response of the carbon-water cycle to increased VPD across global drylands. |
| first_indexed | 2024-03-11T10:31:55Z |
| format | Article |
| id | doaj.art-a8183592a50b46d38a9cc2e2dd47e7f6 |
| institution | Directory Open Access Journal |
| issn | 2624-893X |
| language | English |
| last_indexed | 2024-03-11T10:31:55Z |
| publishDate | 2023-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Forests and Global Change |
| spelling | doaj.art-a8183592a50b46d38a9cc2e2dd47e7f62023-11-14T17:57:24ZengFrontiers Media S.A.Frontiers in Forests and Global Change2624-893X2023-04-01610.3389/ffgc.2023.11643471164347Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylandsRihong Wen0Peng Jiang1Peng Jiang2Meiou Qin3Qingyu Jia4Nan Cong5Xiaoying Wang6Ying Meng7Feiyun Yang8Bin Liu9Mengyuan Zhu10Jiaxing Zu11Ning Chen12Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, ChinaInstitute of Atmospheric Environment, China Meteorological Administration, Shenyang, ChinaChina Meteorological Administration Training Center of Liaoning, Shenyang, ChinaRegional Climate Center of Shenyang, Shenyang, ChinaInstitute of Atmospheric Environment, China Meteorological Administration, Shenyang, ChinaKey Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, ChinaInstitute of Atmospheric Environment, China Meteorological Administration, Shenyang, ChinaChina Meteorological Administration Training Center of Liaoning, Shenyang, ChinaChina Meteorological Administration Training Center, Beijing, ChinaChina Meteorological Administration Training Center of Liaoning, Shenyang, ChinaCollege of Agronomy, Shenyang Agricultural University, Shenyang, ChinaMinistry of Education Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Nanning Normal University, Nanning, ChinaKey Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, ChinaAtmospheric vapor pressure deficit (VPD, indicative of atmospheric water conditions) has been identified as a major driver of global vegetation dynamics. Drylands, including deserts, temperate grasslands, savannas, and dry forests, are more sensitive to water conditions and affect carbon, nitrogen, and water cycles. However, our knowledge is limited on the way increasing VPD affects vegetation growth and evapotranspiration (ET) in global drylands. In this study, we used long-term satellite datasets combined with multiple statistical analyses to examine the relationship between the satellite-derived normalized difference vegetation index (NDVI), a proxy for vegetation growth, and ET to VPD across global drylands. We found that significant decreases in NDVI and ET predominantly influenced the NDVI (RVPD − NDVI) and ET (RVPD − ET) responses to VPD in both the savannas and dry forests of South American, African, and Australian savannas and dry forests, as well as in temperate grasslands (e.g., Eurasian steppes and American prairies). Notably, more than 60% of global drylands exhibited significantly negative RVPD − NDVI and RVPD − ET values. In contrast, the percentage of significantly negative RVPD − NDVI and RVPD − ET decreased to <10% in cold drylands (>60° N). In predominantly warm drylands (60° N~60° S), negative VPD effects were significantly and positively regulated by soil water availability, as determined by multiple linear regression models. However, these significant regulatory effects were not observed in cold drylands. Moving-window analyses further revealed that temporal changes in RVPD − NDVI and RVPD − ET were positively correlated with changes in the Standardized Precipitation Evapotranspiration Index (SPEI). In warm drylands, areas with increasing RVPD − NDVI and RVPD − ET over time showed an increasing trend in the SPEI, whereas areas with a decreasing SPEI showed a negative trend in RVPD − NDVI and RVPD − ET values over time. Given the increasing atmospheric dryness due to climate change, this study highlighted the importance of re-evaluating the representation of the role of water availability in driving the response of the carbon-water cycle to increased VPD across global drylands.https://www.frontiersin.org/articles/10.3389/ffgc.2023.1164347/fullvapor pressure deficitNDVIevapotranspirationwater availabilityregulatory effectsglobal drylands |
| spellingShingle | Rihong Wen Peng Jiang Peng Jiang Meiou Qin Qingyu Jia Nan Cong Xiaoying Wang Ying Meng Feiyun Yang Bin Liu Mengyuan Zhu Jiaxing Zu Ning Chen Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands Frontiers in Forests and Global Change vapor pressure deficit NDVI evapotranspiration water availability regulatory effects global drylands |
| title | Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands |
| title_full | Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands |
| title_fullStr | Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands |
| title_full_unstemmed | Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands |
| title_short | Regulation of NDVI and ET negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands |
| title_sort | regulation of ndvi and et negative responses to increased atmospheric vapor pressure deficit by water availability in global drylands |
| topic | vapor pressure deficit NDVI evapotranspiration water availability regulatory effects global drylands |
| url | https://www.frontiersin.org/articles/10.3389/ffgc.2023.1164347/full |
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