Gross primary production (GPP) and red solar induced fluorescence (SIF) respond differently to light and seasonal environmental conditions in a subalpine conifer forest

Yang, Julia C.; Magney, Troy S.; Albert, Loren P.; Richardson, Andrew D.; Frankenberg, Christian; Stutz, Jochen; Grossmann, Katja; Burns, Sean P.; Seyednasrollah, Bijan; Blanken, Peter D.; Bowling, David R.

doi:10.1016/j.agrformet.2022.108904

Gross primary production (GPP) and red solar induced fluorescence (SIF) respond differently to light and seasonal environmental conditions in a subalpine conifer forest

Journal Article · Sat Mar 12 00:00:00 EST 2022 · Agricultural and Forest Meteorology

DOI:https://doi.org/10.1016/j.agrformet.2022.108904· OSTI ID:1957816

^[1]; ^[2]; ^[3]; ^[4]; Frankenberg, Christian ^[5]; Stutz, Jochen ^[6]; ^[7]; Burns, Sean P. ^[8]; Seyednasrollah, Bijan ^[4]; ^[9]; Bowling, David R. ^[10]

Univ. of Utah, Salt Lake City, UT (United States); University of Colorado
Univ. of California, Davis, CA (United States)
West Virginia Univ., Morgantown, WV (United States)
Northern Arizona Univ., Flagstaff, AZ (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States)
Univ. of California, Los Angeles, CA (United States)
Univ. of Heidelberg (Germany)
National Center for Atmospheric Research, Boulder, CO (United States); Univ. of Colorado, Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States)
Univ. of Utah, Salt Lake City, UT (United States)

The phenology of montane conifer forests is likely to shift in response to climate change and altered seasonal dynamics of light, temperature, and moisture. Solar-induced fluorescence (SIF) is expected to provide substantial improvement for mapping temporal changes in evergreen gross primary production (GPP) over greenness-based remote sensing indices. The utility of SIF to monitor seasonal changes in the phenology of conifer photosynthesis depends on the degree to which GPP and SIF respond in synchrony to key environmental drivers. However, to what extent SIF and GPP become decoupled by responding differently to the combined effects of light and other environmental conditions remains unknown. The goal of this study was to characterize the responses of GPP and SIFred to a suite of environmental drivers at the half-hour time scale and determine how these relationships change across seasons. We analyzed one year of tower-based SIFred and eddy covariance-derived GPP data from a conifer forest at Niwot Ridge, Colorado. We compared the light responses of GPP and SIFred across the year, finding that SIFred increased in response to light earlier in the year than did GPP. The light response of GPP had a positive temperature dependence in spring, and this dependency reversed in summer due to increased evaporative demand, while the light response of SIFred was less temperature dependent. Using artificial neural network ensemble analysis, we found that from spring to summer, SIFred did not exhibit a parallel response to the seasonally dynamic temperature and moisture controls on GPP. In summer SIFred was not correlated with canopy conductance, suggesting that SIF is less sensitive to stomatal control than GPP. Furthermore, our results suggest that, in conifers, photosystems begin to activate in spring prior to when water becomes available for photosynthesis, presenting a challenge for the use of SIF as a phenological indicator in conifer forests.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1957816

Alternate ID(s):: OSTI ID: 1854624

Journal Information:: Agricultural and Forest Meteorology, Journal Name: Agricultural and Forest Meteorology Vol. 317; ISSN 0168-1923

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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