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Integration and Comparison of Multiple Two-Leaf Light Use Efficiency Models Across Global Flux Sites

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Title: Integration and Comparison of Multiple Two-Leaf Light Use Efficiency Models Across Global Flux Sites
Authors: Haoqiang Zhou, Gang Bao, Fei Li, Jiquan Chen, Siqin Tong, Xiaojun Huang, Enliang Guo, Yuhai Bao, Wendu Rina
Source: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 16, Pp 3116-3130 (2023)
Publisher Information: IEEE, 2023.
Publication Year: 2023
Collection: LCC:Ocean engineering
LCC:Geophysics. Cosmic physics
Subject Terms: Eddy covariance (EC), gross primary productivity (GPP), light intensity, model integration, topography, two-leaf LUE model, Ocean engineering, TC1501-1800, Geophysics. Cosmic physics, QC801-809
More Details: Accurate estimation of gross primary productivity (GPP) from the regional to global scale is essential in modeling carbon cycle processes. The recently-developed two-leaf light use efficiency (TL-LUE) model and its revised versions based on different concepts have significantly improved the underlying mechanisms between model assumptions and photosynthetic processing. Yet few studies have compared the advantages of the various two-leaf LUE models for their practical applications. Here, an integrated model referred to as a three-parameter radiation-constrained mountain TL-LUE (RMTL3-LUE) is proposed by combining the radiation scalar of the [radiation-constrained TL-LUE model] and the topographic parameters of the [mountainous TL-LUE model]. In this way, the importance of light intensity and topography on vegetation photosynthesis is integrated. Our calibration and validation of RMTL3-LUE were carried out for 11 ecosystems with in situ eddy covariance measurements around the globe. This indicates that the model can effectively improve the GPP estimates compared with its predecessors. At the landscape scale, RMTL3-LUE can also realistically quantify topographic effects on photosynthesis, with topographic sensitivities of decreasing (increasing) with the slope on the unshaded (shaded) terrain. Furthermore, RMTL3-LUE displays an asymmetric sensitivity to PAR variability, with a low sensitivity to PAR compared with other models under high PAR conditions and a similar sensitivity to PAR in low PARs. Altogether, it is clear that the integration of the merits of multiple TL-LUE models can further improve the photosynthetic processes for various conditions amid more challenges in constructing more complex models.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2151-1535
Relation: https://ieeexplore.ieee.org/document/10078900/; https://doaj.org/toc/2151-1535
DOI: 10.1109/JSTARS.2023.3259388
Access URL: https://doaj.org/article/aebb559d41d8421e87565e4784926aad
Accession Number: edsdoj.bb559d41d8421e87565e4784926aad
Database: Directory of Open Access Journals
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  Data: Integration and Comparison of Multiple Two-Leaf Light Use Efficiency Models Across Global Flux Sites
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  Data: LCC:Ocean engineering<br />LCC:Geophysics. Cosmic physics
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  Data: <searchLink fieldCode="DE" term="%22Eddy+covariance+%28EC%29%22">Eddy covariance (EC)</searchLink><br /><searchLink fieldCode="DE" term="%22gross+primary+productivity+%28GPP%29%22">gross primary productivity (GPP)</searchLink><br /><searchLink fieldCode="DE" term="%22light+intensity%22">light intensity</searchLink><br /><searchLink fieldCode="DE" term="%22model+integration%22">model integration</searchLink><br /><searchLink fieldCode="DE" term="%22topography%22">topography</searchLink><br /><searchLink fieldCode="DE" term="%22two-leaf+LUE+model%22">two-leaf LUE model</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+engineering%22">Ocean engineering</searchLink><br /><searchLink fieldCode="DE" term="%22TC1501-1800%22">TC1501-1800</searchLink><br /><searchLink fieldCode="DE" term="%22Geophysics%2E+Cosmic+physics%22">Geophysics. Cosmic physics</searchLink><br /><searchLink fieldCode="DE" term="%22QC801-809%22">QC801-809</searchLink>
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  Data: Accurate estimation of gross primary productivity (GPP) from the regional to global scale is essential in modeling carbon cycle processes. The recently-developed two-leaf light use efficiency (TL-LUE) model and its revised versions based on different concepts have significantly improved the underlying mechanisms between model assumptions and photosynthetic processing. Yet few studies have compared the advantages of the various two-leaf LUE models for their practical applications. Here, an integrated model referred to as a three-parameter radiation-constrained mountain TL-LUE (RMTL3-LUE) is proposed by combining the radiation scalar of the [radiation-constrained TL-LUE model] and the topographic parameters of the [mountainous TL-LUE model]. In this way, the importance of light intensity and topography on vegetation photosynthesis is integrated. Our calibration and validation of RMTL3-LUE were carried out for 11 ecosystems with in situ eddy covariance measurements around the globe. This indicates that the model can effectively improve the GPP estimates compared with its predecessors. At the landscape scale, RMTL3-LUE can also realistically quantify topographic effects on photosynthesis, with topographic sensitivities of decreasing (increasing) with the slope on the unshaded (shaded) terrain. Furthermore, RMTL3-LUE displays an asymmetric sensitivity to PAR variability, with a low sensitivity to PAR compared with other models under high PAR conditions and a similar sensitivity to PAR in low PARs. Altogether, it is clear that the integration of the merits of multiple TL-LUE models can further improve the photosynthetic processes for various conditions amid more challenges in constructing more complex models.
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        Value: 10.1109/JSTARS.2023.3259388
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      – Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 3116
    Subjects:
      – SubjectFull: Eddy covariance (EC)
        Type: general
      – SubjectFull: gross primary productivity (GPP)
        Type: general
      – SubjectFull: light intensity
        Type: general
      – SubjectFull: model integration
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      – SubjectFull: topography
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      – SubjectFull: two-leaf LUE model
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      – SubjectFull: Ocean engineering
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      – SubjectFull: TC1501-1800
        Type: general
      – SubjectFull: Geophysics. Cosmic physics
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      – SubjectFull: QC801-809
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      – TitleFull: Integration and Comparison of Multiple Two-Leaf Light Use Efficiency Models Across Global Flux Sites
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