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Optical properties of dissolved organic matter in throughfall and stemflow vary across tree species and season in a temperate headwater forest.

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Title: Optical properties of dissolved organic matter in throughfall and stemflow vary across tree species and season in a temperate headwater forest.
Authors: Ryan, Kevin A.1,2 (AUTHOR) karyan@usgs.gov, Adler, Thomas3 (AUTHOR), Chalmers, Ann T.4 (AUTHOR), Perdrial, Julia3 (AUTHOR), Sebestyen, Stephen5 (AUTHOR), Shanley, James B.4 (AUTHOR), Stubbins, Aron6 (AUTHOR)
Source: Biogeochemistry. May2023, Vol. 164 Issue 1, p53-72. 20p.
Subjects: Throughfall, Dissolved organic matter, Temperate forests, Optical properties, Fluorescence spectroscopy, Deciduous forests
Geographic Terms: Vermont
Abstract: Tree-derived dissolved organic matter (DOM) comprises a significant carbon flux within forested watersheds. Few studies have assessed the optical properties of tree-derived DOM. To increase understanding of the factors controlling tree-derived DOM quality, we measured DOM optical properties, dissolved organic carbon (DOC) and calcium concentrations in throughfall and stemflow for 17 individual rain events during summer and fall in a temperate deciduous forest in Vermont, United States. DOC and calcium fluxes in throughfall and stemflow were enriched on average 4 to 70 times incident fluxes in rain. A multiway model was developed using absorbance and fluorescence spectroscopy to further characterize DOM optical properties. Throughfall contained a higher percentage of protein-like DOM fluorescence than stemflow while stemflow was characterized by a higher percentage of humic-like DOM fluorescence. DOM absorbance spectral slopes in yellow birch (Betula alleghaniensis) stemflow were significantly higher than in sugar maple (Acer saccharum) stemflow. DOM optical metrics were not influenced by rainfall volume, but percent protein-like fluorescence increased in throughfall during autumn when leaves senesced. Given the potential influence of tree-derived DOM fluxes on receiving soils and downstream ecosystems, future modeling of DOM transport and soil biogeochemistry should represent the influence of differing DOM quality in throughfall and stemflow across tree species and seasons. [ABSTRACT FROM AUTHOR]
Copyright of Biogeochemistry is the property of Springer Nature 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: Optical properties of dissolved organic matter in throughfall and stemflow vary across tree species and season in a temperate headwater forest.
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  Data: <searchLink fieldCode="JN" term="%22Biogeochemistry%22">Biogeochemistry</searchLink>. May2023, Vol. 164 Issue 1, p53-72. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Throughfall%22">Throughfall</searchLink><br /><searchLink fieldCode="DE" term="%22Dissolved+organic+matter%22">Dissolved organic matter</searchLink><br /><searchLink fieldCode="DE" term="%22Temperate+forests%22">Temperate forests</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+properties%22">Optical properties</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorescence+spectroscopy%22">Fluorescence spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Deciduous+forests%22">Deciduous forests</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Vermont%22">Vermont</searchLink>
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  Data: Tree-derived dissolved organic matter (DOM) comprises a significant carbon flux within forested watersheds. Few studies have assessed the optical properties of tree-derived DOM. To increase understanding of the factors controlling tree-derived DOM quality, we measured DOM optical properties, dissolved organic carbon (DOC) and calcium concentrations in throughfall and stemflow for 17 individual rain events during summer and fall in a temperate deciduous forest in Vermont, United States. DOC and calcium fluxes in throughfall and stemflow were enriched on average 4 to 70 times incident fluxes in rain. A multiway model was developed using absorbance and fluorescence spectroscopy to further characterize DOM optical properties. Throughfall contained a higher percentage of protein-like DOM fluorescence than stemflow while stemflow was characterized by a higher percentage of humic-like DOM fluorescence. DOM absorbance spectral slopes in yellow birch (Betula alleghaniensis) stemflow were significantly higher than in sugar maple (Acer saccharum) stemflow. DOM optical metrics were not influenced by rainfall volume, but percent protein-like fluorescence increased in throughfall during autumn when leaves senesced. Given the potential influence of tree-derived DOM fluxes on receiving soils and downstream ecosystems, future modeling of DOM transport and soil biogeochemistry should represent the influence of differing DOM quality in throughfall and stemflow across tree species and seasons. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Biogeochemistry is the property of Springer Nature 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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        Value: 10.1007/s10533-022-00985-x
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      – Code: eng
        Text: English
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    Subjects:
      – SubjectFull: Throughfall
        Type: general
      – SubjectFull: Dissolved organic matter
        Type: general
      – SubjectFull: Temperate forests
        Type: general
      – SubjectFull: Optical properties
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      – SubjectFull: Fluorescence spectroscopy
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      – SubjectFull: Deciduous forests
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      – SubjectFull: Vermont
        Type: general
    Titles:
      – TitleFull: Optical properties of dissolved organic matter in throughfall and stemflow vary across tree species and season in a temperate headwater forest.
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            – D: 01
              M: 05
              Text: May2023
              Type: published
              Y: 2023
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