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Drivers of Spatiotemporal Patterns of Riparian Forest NDVI Along a Hydroclimatic Gradient.

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Title: Drivers of Spatiotemporal Patterns of Riparian Forest NDVI Along a Hydroclimatic Gradient.
Authors: Lochin, Pierre1 (AUTHOR) pierre.lochin@ens-lyon.fr, Piégay, Hervé1 (AUTHOR), Stella, John C.2 (AUTHOR), Caylor, Kelly K.3,4,5 (AUTHOR), Vaudor, Lise1 (AUTHOR), Bliss Singer, Michael3,6,7 (AUTHOR)
Source: Ecohydrology. Mar2025, Vol. 18 Issue 2, p1-17. 17p.
Subject Terms: *Riparian forests, *Ecosystem management, *Environmental engineering, *Water supply, *Vegetation greenness, Forest resilience
Abstract: In the context of rising global temperatures and their impact on weather patterns and water cycles, understanding the relationship between vegetation and hydroclimatic forcing is critical. Riparian forests are highly vulnerable to hydroclimatic variability, which can significantly affect water availability in the soil on which they primarily depend. Along large rivers, hydroclimatic forcings can vary, resulting in different vegetative responses depending on the local climatic context and site conditions. To explore this, we studied riparian forest greenness along a 512‐km river corridor with a 3° latitudinal gradient, analysing the relative contributions of climate (latitude, season, temperature, precipitation) and local hydrological conditions (groundwater). Here, we show that riparian forests along a latitudinal gradient respond differently to hydroclimatic controls, with vegetative dynamics that can be attenuated or accentuated by local site conditions. We combined Sentinel‐2 satellite Normalised Difference Vegetation Index (NDVI) data over seven years (2016–2022) with hydroclimatic data to examine riparian forest greenness responses to latitudinal, seasonal and interannual hydroclimatic variability. We found contrasting hydroclimatic controls across the latitudinal gradient, with the northernmost sites predominantly controlled by temperature, while those further south are limited by water availability. In addition, we identified temperature as the primary driver of NDVI throughout the growing season, either positively or negatively. Late season precipitation and high phreatic water availability positively influenced NDVI, emphasising the role of local conditions in governing riparian forest resilience. This study enhances understanding of climate controls on riparian tree greenness, which is critical for designing effective landscape‐scale riparian ecosystem management and restoration strategies. [ABSTRACT FROM AUTHOR]
Copyright of Ecohydrology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Drivers of Spatiotemporal Patterns of Riparian Forest NDVI Along a Hydroclimatic Gradient.
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  Data: <searchLink fieldCode="AR" term="%22Lochin%2C+Pierre%22">Lochin, Pierre</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> pierre.lochin@ens-lyon.fr</i><br /><searchLink fieldCode="AR" term="%22Piégay%2C+Hervé%22">Piégay, Hervé</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Stella%2C+John C%2E%22">Stella, John C.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Caylor%2C+Kelly K%2E%22">Caylor, Kelly K.</searchLink><relatesTo>3,4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Vaudor%2C+Lise%22">Vaudor, Lise</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bliss Singer%2C+Michael%22">Bliss Singer, Michael</searchLink><relatesTo>3,6,7</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ecohydrology%22">Ecohydrology</searchLink>. Mar2025, Vol. 18 Issue 2, p1-17. 17p.
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  Data: *<searchLink fieldCode="DE" term="%22Riparian+forests%22">Riparian forests</searchLink><br />*<searchLink fieldCode="DE" term="%22Ecosystem+management%22">Ecosystem management</searchLink><br />*<searchLink fieldCode="DE" term="%22Environmental+engineering%22">Environmental engineering</searchLink><br />*<searchLink fieldCode="DE" term="%22Water+supply%22">Water supply</searchLink><br />*<searchLink fieldCode="DE" term="%22Vegetation+greenness%22">Vegetation greenness</searchLink><br /><searchLink fieldCode="DE" term="%22Forest+resilience%22">Forest resilience</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In the context of rising global temperatures and their impact on weather patterns and water cycles, understanding the relationship between vegetation and hydroclimatic forcing is critical. Riparian forests are highly vulnerable to hydroclimatic variability, which can significantly affect water availability in the soil on which they primarily depend. Along large rivers, hydroclimatic forcings can vary, resulting in different vegetative responses depending on the local climatic context and site conditions. To explore this, we studied riparian forest greenness along a 512‐km river corridor with a 3° latitudinal gradient, analysing the relative contributions of climate (latitude, season, temperature, precipitation) and local hydrological conditions (groundwater). Here, we show that riparian forests along a latitudinal gradient respond differently to hydroclimatic controls, with vegetative dynamics that can be attenuated or accentuated by local site conditions. We combined Sentinel‐2 satellite Normalised Difference Vegetation Index (NDVI) data over seven years (2016–2022) with hydroclimatic data to examine riparian forest greenness responses to latitudinal, seasonal and interannual hydroclimatic variability. We found contrasting hydroclimatic controls across the latitudinal gradient, with the northernmost sites predominantly controlled by temperature, while those further south are limited by water availability. In addition, we identified temperature as the primary driver of NDVI throughout the growing season, either positively or negatively. Late season precipitation and high phreatic water availability positively influenced NDVI, emphasising the role of local conditions in governing riparian forest resilience. This study enhances understanding of climate controls on riparian tree greenness, which is critical for designing effective landscape‐scale riparian ecosystem management and restoration strategies. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecohydrology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Water supply
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      – SubjectFull: Vegetation greenness
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      – SubjectFull: Forest resilience
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      – TitleFull: Drivers of Spatiotemporal Patterns of Riparian Forest NDVI Along a Hydroclimatic Gradient.
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              Text: Mar2025
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