Chlorophyll fluorescence tracks seasonal variations of photosynthesis from leaf to canopy in a temperate forest

Yang, Hong; Yang, Xi; Zhang, Yongguang; Heskel, Mary A.; Lü, Xiaoliang; Munger, J. William; Sun, Shucun; Tang, Jianwu

doi:10.1111/gcb.13590

Cited by 150 publications

(116 citation statements)

References 67 publications

(109 reference statements)

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…The SIF–GPP relationship was mainly dominated by APAR and also affected by the covariations in LUEp and Θ f (Equations and ). Both LUEp and Θ f vary with environmental conditions (e.g., light, water, atmospheric CO 2 ) and could be positively correlated with each other (Yang et al., , ). Therefore, should a universal SIF–GPP linear relationship exist, at least the variations in LUE p and Θ f among biomes should offset each other (Sun et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Understanding how SIF responds to APAR and environmental factors can help reveal the underlying mechanisms of the observed strong relationship between SIF and GPP. Previous studies suggested that APAR dominated the SIF–GPP relationship, while SIF also contained information on environmental stresses that were closely associated with LUE p (Li, Xiao, & He, ; Walther et al., ; Yang et al., , ). A recent study used GOME‐2 SIF observations as a proxy for GPP to identify the dominant bioclimatic control factors (e.g., VPD, Tmin, soil moisture) that influence primary productivity (Madani et al., ).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Solar‐induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO‐2 and flux tower observations

Xiao

et al. 2018

Global Change Biology

301

215

View full text Add to dashboard Cite

Solar-induced chlorophyll fluorescence (SIF) has been increasingly used as a proxy for terrestrial gross primary productivity (GPP). Previous work mainly evaluated the relationship between satellite-observed SIF and gridded GPP products both based on coarse spatial resolutions. Finer resolution SIF (1.3 km × 2.25 km) measured from the Orbiting Carbon Observatory-2 (OCO-2) provides the first opportunity to examine the SIF-GPP relationship at the ecosystem scale using flux tower GPP data. However, it remains unclear how strong the relationship is for each biome and whether a robust, universal relationship exists across a variety of biomes. Here we conducted the first global analysis of the relationship between OCO-2 SIF and tower GPP for a total of 64 flux sites across the globe encompassing eight major biomes. OCO-2 SIF showed strong correlations with tower GPP at both midday and daily timescales, with the strongest relationship observed for daily SIF at the 757 nm (R = 0.72, p < 0.0001). Strong linear relationships between SIF and GPP were consistently found for all biomes (R = 0.57-0.79, p < 0.0001) except evergreen broadleaf forests (R = 0.16, p < 0.05) at the daily timescale. A higher slope was found for C grasslands and croplands than for C ecosystems. The generally consistent slope of the relationship among biomes suggests a nearly universal rather than biome-specific SIF-GPP relationship, and this finding is an important distinction and simplification compared to previous results. SIF was mainly driven by absorbed photosynthetically active radiation and was also influenced by environmental stresses (temperature and water stresses) that determine photosynthetic light use efficiency. OCO-2 SIF generally had a better performance for predicting GPP than satellite-derived vegetation indices and a light use efficiency model. The universal SIF-GPP relationship can potentially lead to more accurate GPP estimates regionally or globally. Our findings revealed the remarkable ability of finer resolution SIF observations from OCO-2 and other new or future missions (e.g., TROPOMI, FLEX) for estimating terrestrial photosynthesis across a wide variety of biomes and identified their potential and limitations for ecosystem functioning and carbon cycle studies.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Solar‐induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO‐2 and flux tower observations

Xiao

et al. 2018

Global Change Biology

301

215

View full text Add to dashboard Cite

show abstract

“…For these sites, SIF GOME2 was able to capture early‐season photosynthesis that was not captured by either EVI or PRI (Figure S5 and Table S2). A likely explanation for this result is that proxies based on changes in vegetation greenness (i.e., EVI and PRI) fail to capture seasonal photosynthetic activity of evergreen trees, since greenness and photosynthesis are often decoupled for this vegetation type (Verma et al, ; Vicca et al, ; Walther et al, ), whereas SIF is a direct measure of photosynthetic activity (Manish Verma et al, ; Walther et al, ; Yang et al, ). We suspect that EVI and PRI seasonality in these subregions is more likely tracking changes in greenness of intermixed (e.g., subcanopy) annual and deciduous vegetation (Manish Verma et al, ; Verma et al, ; Vicca et al, ).…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll Fluorescence Better Captures Seasonal and Interannual Gross Primary Productivity Dynamics Across Dryland Ecosystems of Southwestern North America

Smith

Biederman

Scott

et al. 2018

Geophysical Research Letters

128

100

View full text Add to dashboard Cite

Satellite remote sensing provides unmatched spatiotemporal information on vegetation gross primary productivity (GPP). Yet understanding of the relationship between GPP and remote sensing observations and how it changes with factors such as scale, biophysical constraint, and vegetation type remains limited. This knowledge gap is especially apparent for dryland ecosystems, which have characteristic high spatiotemporal variability and are under‐represented by long‐term field measurements. Here we utilize an eddy covariance (EC) data synthesis for southwestern North America in an assessment of how accurately satellite‐derived vegetation proxies capture seasonal to interannual GPP dynamics across dryland gradients. We evaluate the enhanced vegetation index, solar‐induced fluorescence (SIF), and the photochemical reflectivity index. We find evidence that SIF is more accurately capturing seasonal GPP dynamics particularly for evergreen‐dominated EC sites and more accurately estimating the full magnitude of interannual GPP dynamics for all dryland EC sites. These results suggest that incorporation of SIF could significantly improve satellite‐based GPP estimates.

show abstract

“…The uncoupling between electron transport and photosynthesis during the dry season suggests that another process, such as photorespiration, was contributing to energy and power reduction (ATP, NADPH, Fd − ) utilization generated in the electron transport chain (Haupt‐Herting & Fock, ; Lawlor & Tezara, ; Martínez‐Ferri, Balaguer, Valladares, Chico, & Manrique, ). Moreover, this uncoupling can add more complexity for obtaining landscape‐level photosynthesis estimates based on the chlorophyll fluorescence signal (Osuna, Baldocchi, Kobayashi, & Dawson, ; Yang et al., ).…”

Section: Discussionmentioning

confidence: 99%

Causes of reduced leaf‐level photosynthesis during strong El Niño drought in a Central Amazon forest

Santos

Ferreira

Rodrigues

et al. 2018

Global Change Biology

View full text Add to dashboard Cite

Sustained drought and concomitant high temperature may reduce photosynthesis and cause tree mortality. Possible causes of reduced photosynthesis include stomatal closure and biochemical inhibition, but their relative roles are unknown in Amazon trees during strong drought events. We assessed the effects of the recent (2015) strong El Niño drought on leaf-level photosynthesis of Central Amazon trees via these two mechanisms. Through four seasons of 2015, we measured leaf gas exchange, chlorophyll a fluorescence parameters, chlorophyll concentration, and nutrient content in leaves of 57 upper canopy and understory trees of a lowland terra firme forest on well-drained infertile oxisol. Photosynthesis decreased 28% in the upper canopy and 17% in understory trees during the extreme dry season of 2015, relative to other 2015 seasons and was also lower than the climatically normal dry season of the following non-El Niño year. Photosynthesis reduction under extreme drought and high temperature in the 2015 dry season was related only to stomatal closure in both upper canopy and understory trees, and not to chlorophyll a fluorescence parameters, chlorophyll, or leaf nutrient concentration. The distinction is important because stomatal closure is a transient regulatory response that can reverse when water becomes available, whereas the other responses reflect more permanent changes or damage to the photosynthetic apparatus. Photosynthesis decrease due to stomatal closure during the 2015 extreme dry season was followed 2 months later by an increase in photosynthesis as rains returned, indicating a margin of resilience to one-off extreme climatic events in Amazonian forests.

show abstract

Chlorophyll fluorescence tracks seasonal variations of photosynthesis from leaf to canopy in a temperate forest

Abstract: 21Accurate estimation of terrestrial gross primary productivity (GPP) remains a challenge despite its 22 importance in the global carbon cycle. Chlorophyll fluorescence (ChlF)

Cited by 150 publications

References 67 publications

Solar‐induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO‐2 and flux tower observations

Solar‐induced chlorophyll fluorescence is strongly correlated with terrestrial photosynthesis for a wide variety of biomes: First global analysis based on OCO‐2 and flux tower observations

Chlorophyll Fluorescence Better Captures Seasonal and Interannual Gross Primary Productivity Dynamics Across Dryland Ecosystems of Southwestern North America

Causes of reduced leaf‐level photosynthesis during strong El Niño drought in a Central Amazon forest

Contact Info

Product

Resources

About