Graduate Thesis Or Dissertation
 

Assessing the Potential for Solar-Induced Chlorophyll Fluorescence to Inform Evapotranspiration Partitioning

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6m311w437

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  • Transpiration (T), or the evaporation of water through plant stomata, plays a critical role in climate and biophysical processes at the earth’s surface. While T makes up a majority of the terrestrial evapotranspiration (ET) flux on a global scale, the partitioning of ET is variable and remains elusive. Because photosynthetic carbon uptake and T are strongly coupled by stomatal gas exchange, many ET partitioning approaches leverage information on photosynthesis. Here we examine the ability of solar-induced chlorophyll fluorescence (SIF), an optical signal stemming from the photosynthetic machinery, to inform ET partitioning. We conducted a field campaign in a hazelnut orchard during the 2019 growing season, simultaneously observing SIF, ET from eddy covariance, and T derived from sap flux measurements. Additionally, we inverted the Penman-Monteith equation using both evaporative fluxes to examine the relationship between SIF and canopy conductance. SIF explained more variation in T than ET at all time scales considered and was more strongly coupled to T on a diurnal basis. The relationships between SIF and both canopy conductances were weak and nonlinear when considering the data at the half-hour measurement interval, but at the daily scale SIF had a statistically significant, inverse linear relationships with canopy conductance. This relationship was stronger when canopy conductance was derived from T, and adding SIF to an empirical model of canopy conductance derived from T improved predictions. This work demonstrates that SIF provides additional information on biological control of T and has potential to improve ET partitioning when combined with meteorological observations.
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  • This research was partially supported by the Washington Tree Fruit Research Commission
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  • Pending Publication
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  • 2020-06-11 to 2021-07-12

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