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Drought and waterlogging stress regimes in northern peatlands detected through satellite retrieved solar-induced chlorophyll fluorescence

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Abstract
The water table depth (WTD) in peatlands determines the soil carbon decomposition rate and influences vegetation growth, hence the above-ground carbon assimilation. Here, we used satellite-observed Solar-Induced chlorophyll Fluorescence (SIF) as a proxy of Gross Primary Production (GPP) to investigate water-related vegetation stress over northern peatlands. A linear model with interaction effects was used to relate short- and long-term anomalies in SIF with WTD anomalies and the absolute WTD. Most locations showed the occurrence of drought and waterlogging stress though regions with exclusively waterlogging or drought stress were also detected. As a spatial median, minimal water-related vegetation stress was found for a WTD of -0.22 m (short-term) and -0.20 m (long-term) (+/- 0.01 m, 95% confidence interval of statistical uncertainty). The stress response observed with SIF is supported by an analysis of in situ GPP data. Our findings provide insight into how changes in WTD of northern peatlands could affect GPP under climate change. Water table depth is an important variable influencing the carbon cycle and vegetation growth in northern peatlands. In this paper, the impact of changing wetness conditions on vegetation growth over peatlands was studied through satellite measurements of solar-induced fluorescence (SIF), which is a radiation signal emitted by vegetation during photosynthesis. Previous studies over ecosystems on mineral soil, that is, not over peatland, suggested a response of SIF to drought conditions. In our study, it was shown that peatland vegetation experiences moisture-related growth stress under both very wet and very dry conditions, which might reduce the photosynthesis efficiency and the ability to capture and store CO2. Stress due to drought conditions was detected for peatlands in the south of the Western Siberian Lowlands and the Boreal Plains. Stress due to prolonged wet conditions occurred for example, in the north of the Western Siberian Lowlands and the north of the Hudson Bay Lowlands. Spaceborne Solar-Induced Fluorescence (SIF) data was used to analyze soil moisture-related vegetation stress regimes in northern peatlandsFor most locations, waterlogging as well as drought stress regimes occurred and alternated depending on peatland water level dynamicsThe SIF-based stress response observations are supported by in situ data of Gross Primary Production
Keywords
peatlands, solar induced chlorophyll fluorescence, carbon cycle, hydrology, drought, gross primary production, SUN-INDUCED FLUORESCENCE, CARBON-DIOXIDE, WATER-TABLE, SPECTRAL REFLECTANCE, BOREAL FEN, PHOTOSYNTHESIS, FLUXES, ASSIMILATION, TEMPERATURE, ACCUMULATION

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MLA
Valkenborg, Bram, et al. “Drought and Waterlogging Stress Regimes in Northern Peatlands Detected through Satellite Retrieved Solar-Induced Chlorophyll Fluorescence.” GEOPHYSICAL RESEARCH LETTERS, vol. 50, no. 19, 2023, doi:10.1029/2023GL105205.
APA
Valkenborg, B., De Lannoy, G. J. M., Gruber, A., Miralles, D., Koehler, P., Frankenberg, C., … Bechtold, M. (2023). Drought and waterlogging stress regimes in northern peatlands detected through satellite retrieved solar-induced chlorophyll fluorescence. GEOPHYSICAL RESEARCH LETTERS, 50(19). https://doi.org/10.1029/2023GL105205
Chicago author-date
Valkenborg, Bram, Gabrielle J. M. De Lannoy, Alexander Gruber, Diego Miralles, Philipp Koehler, Christian Frankenberg, Ankur R. Desai, et al. 2023. “Drought and Waterlogging Stress Regimes in Northern Peatlands Detected through Satellite Retrieved Solar-Induced Chlorophyll Fluorescence.” GEOPHYSICAL RESEARCH LETTERS 50 (19). https://doi.org/10.1029/2023GL105205.
Chicago author-date (all authors)
Valkenborg, Bram, Gabrielle J. M. De Lannoy, Alexander Gruber, Diego Miralles, Philipp Koehler, Christian Frankenberg, Ankur R. Desai, Elyn Humphreys, Janina Klatt, Annalea Lohila, Mats B. Nilsson, Eeva-Stiina Tuittila, and Michel Bechtold. 2023. “Drought and Waterlogging Stress Regimes in Northern Peatlands Detected through Satellite Retrieved Solar-Induced Chlorophyll Fluorescence.” GEOPHYSICAL RESEARCH LETTERS 50 (19). doi:10.1029/2023GL105205.
Vancouver
1.
Valkenborg B, De Lannoy GJM, Gruber A, Miralles D, Koehler P, Frankenberg C, et al. Drought and waterlogging stress regimes in northern peatlands detected through satellite retrieved solar-induced chlorophyll fluorescence. GEOPHYSICAL RESEARCH LETTERS. 2023;50(19).
IEEE
[1]
B. Valkenborg et al., “Drought and waterlogging stress regimes in northern peatlands detected through satellite retrieved solar-induced chlorophyll fluorescence,” GEOPHYSICAL RESEARCH LETTERS, vol. 50, no. 19, 2023.
@article{01HF6G8XFT380BWWM7WYMV2HDK,
  abstract     = {{The water table depth (WTD) in peatlands determines the soil carbon decomposition rate and influences vegetation growth, hence the above-ground carbon assimilation. Here, we used satellite-observed Solar-Induced chlorophyll Fluorescence (SIF) as a proxy of Gross Primary Production (GPP) to investigate water-related vegetation stress over northern peatlands. A linear model with interaction effects was used to relate short- and long-term anomalies in SIF with WTD anomalies and the absolute WTD. Most locations showed the occurrence of drought and waterlogging stress though regions with exclusively waterlogging or drought stress were also detected. As a spatial median, minimal water-related vegetation stress was found for a WTD of -0.22 m (short-term) and -0.20 m (long-term) (+/- 0.01 m, 95% confidence interval of statistical uncertainty). The stress response observed with SIF is supported by an analysis of in situ GPP data. Our findings provide insight into how changes in WTD of northern peatlands could affect GPP under climate change. Water table depth is an important variable influencing the carbon cycle and vegetation growth in northern peatlands. In this paper, the impact of changing wetness conditions on vegetation growth over peatlands was studied through satellite measurements of solar-induced fluorescence (SIF), which is a radiation signal emitted by vegetation during photosynthesis. Previous studies over ecosystems on mineral soil, that is, not over peatland, suggested a response of SIF to drought conditions. In our study, it was shown that peatland vegetation experiences moisture-related growth stress under both very wet and very dry conditions, which might reduce the photosynthesis efficiency and the ability to capture and store CO2. Stress due to drought conditions was detected for peatlands in the south of the Western Siberian Lowlands and the Boreal Plains. Stress due to prolonged wet conditions occurred for example, in the north of the Western Siberian Lowlands and the north of the Hudson Bay Lowlands. Spaceborne Solar-Induced Fluorescence (SIF) data was used to analyze soil moisture-related vegetation stress regimes in northern peatlandsFor most locations, waterlogging as well as drought stress regimes occurred and alternated depending on peatland water level dynamicsThe SIF-based stress response observations are supported by in situ data of Gross Primary Production}},
  articleno    = {{e2023GL105205}},
  author       = {{Valkenborg, Bram and  De Lannoy, Gabrielle J. M. and  Gruber, Alexander and Miralles, Diego and  Koehler, Philipp and  Frankenberg, Christian and  Desai, Ankur R. and  Humphreys, Elyn and  Klatt, Janina and  Lohila, Annalea and  Nilsson, Mats B. and  Tuittila, Eeva-Stiina and  Bechtold, Michel}},
  issn         = {{0094-8276}},
  journal      = {{GEOPHYSICAL RESEARCH LETTERS}},
  keywords     = {{peatlands,solar induced chlorophyll fluorescence,carbon cycle,hydrology,drought,gross primary production,SUN-INDUCED FLUORESCENCE,CARBON-DIOXIDE,WATER-TABLE,SPECTRAL REFLECTANCE,BOREAL FEN,PHOTOSYNTHESIS,FLUXES,ASSIMILATION,TEMPERATURE,ACCUMULATION}},
  language     = {{eng}},
  number       = {{19}},
  pages        = {{12}},
  title        = {{Drought and waterlogging stress regimes in northern peatlands detected through satellite retrieved solar-induced chlorophyll fluorescence}},
  url          = {{http://doi.org/10.1029/2023GL105205}},
  volume       = {{50}},
  year         = {{2023}},
}

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