Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition
Northern hemisphere evergreen needleleaf forest (ENF) contributes a significant fraction of global water exchange but regional transpiration (T) observation in ENF ecosystems is still challenging. Traditional remote sensing techniques and terrestrial biosphere models reproduce the transpiration seas...
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MDPI AG
2022-01-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/13/1/74 |
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| author | Weiwei Cong Kaijie Yang Feng Wang |
| author_facet | Weiwei Cong Kaijie Yang Feng Wang |
| author_sort | Weiwei Cong |
| collection | DOAJ |
| description | Northern hemisphere evergreen needleleaf forest (ENF) contributes a significant fraction of global water exchange but regional transpiration (T) observation in ENF ecosystems is still challenging. Traditional remote sensing techniques and terrestrial biosphere models reproduce the transpiration seasonality with difficulty, and with large uncertainties. Solar-induced chlorophyll fluorescence (SIF) emission from vegetation correlates to photosynthesis at multiple spatial and temporal scales. However, how SIF links to transpiration of evergreen forest during seasonal transition is unclear. Here, we explored the relationship between canopy SIF and T retrieved from ground observation towers in ENF. We also examined the role of meteorological and soil factors on the relationship between SIF and T. A slow decrease of SIF and T with a fast reduction in photosynthetically active radiation (PAR), air temperature, vapor pressure deficit (VPD), soil temperature and soil water content (SWC) were found in the ENF during the fall transition. The correlation between SIF and T at hourly and daily scales varied significantly among different months (<i>Pearson correlation coefficient</i> = 0.29–0.68, <i>p</i> < 0.01). SIF and T were significantly linearly correlated at hourly (R<sup>2</sup> = 0.53, <i>p</i> < 0.001) and daily (R<sup>2</sup> = 0.67, <i>p</i> < 0.001) timescales in the October. Air temperature and PAR were the major moderating factors for the relationship between SIF and T in the fall transition. Soil water content (SWC) influenced the SIF-T relationship at an hourly scale. Soil temperature and VPD’s effect on the SIF-T relationship was evident at a daily scale. This study can help extend the possibility of constraining ecosystem T by SIF at an unprecedented spatiotemporal resolution during season transitions. |
| first_indexed | 2024-03-10T01:28:01Z |
| format | Article |
| id | doaj.art-af6bf414697d4bcfae385ef9c693d3cf |
| institution | Directory Open Access Journal |
| issn | 1999-4907 |
| language | English |
| last_indexed | 2024-03-10T01:28:01Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Forests |
| spelling | doaj.art-af6bf414697d4bcfae385ef9c693d3cf2023-11-23T13:47:24ZengMDPI AGForests1999-49072022-01-011317410.3390/f13010074Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall TransitionWeiwei Cong0Kaijie Yang1Feng Wang2College of Agronomy, Shenyang Agricultural University, Shenyang 110161, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaInstitute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, ChinaNorthern hemisphere evergreen needleleaf forest (ENF) contributes a significant fraction of global water exchange but regional transpiration (T) observation in ENF ecosystems is still challenging. Traditional remote sensing techniques and terrestrial biosphere models reproduce the transpiration seasonality with difficulty, and with large uncertainties. Solar-induced chlorophyll fluorescence (SIF) emission from vegetation correlates to photosynthesis at multiple spatial and temporal scales. However, how SIF links to transpiration of evergreen forest during seasonal transition is unclear. Here, we explored the relationship between canopy SIF and T retrieved from ground observation towers in ENF. We also examined the role of meteorological and soil factors on the relationship between SIF and T. A slow decrease of SIF and T with a fast reduction in photosynthetically active radiation (PAR), air temperature, vapor pressure deficit (VPD), soil temperature and soil water content (SWC) were found in the ENF during the fall transition. The correlation between SIF and T at hourly and daily scales varied significantly among different months (<i>Pearson correlation coefficient</i> = 0.29–0.68, <i>p</i> < 0.01). SIF and T were significantly linearly correlated at hourly (R<sup>2</sup> = 0.53, <i>p</i> < 0.001) and daily (R<sup>2</sup> = 0.67, <i>p</i> < 0.001) timescales in the October. Air temperature and PAR were the major moderating factors for the relationship between SIF and T in the fall transition. Soil water content (SWC) influenced the SIF-T relationship at an hourly scale. Soil temperature and VPD’s effect on the SIF-T relationship was evident at a daily scale. This study can help extend the possibility of constraining ecosystem T by SIF at an unprecedented spatiotemporal resolution during season transitions.https://www.mdpi.com/1999-4907/13/1/74evergreen needleleaf forestsolar-induced chlorophyll fluorescencetranspirationlinear correlationair temperaturephotosynthetically active radiation |
| spellingShingle | Weiwei Cong Kaijie Yang Feng Wang Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition Forests evergreen needleleaf forest solar-induced chlorophyll fluorescence transpiration linear correlation air temperature photosynthetically active radiation |
| title | Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition |
| title_full | Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition |
| title_fullStr | Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition |
| title_full_unstemmed | Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition |
| title_short | Canopy Solar-Induced Chlorophyll Fluorescence and Its Link to Transpiration in a Temperate Evergreen Needleleaf Forest during the Fall Transition |
| title_sort | canopy solar induced chlorophyll fluorescence and its link to transpiration in a temperate evergreen needleleaf forest during the fall transition |
| topic | evergreen needleleaf forest solar-induced chlorophyll fluorescence transpiration linear correlation air temperature photosynthetically active radiation |
| url | https://www.mdpi.com/1999-4907/13/1/74 |
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