Performance of solar-induced chlorophyll fluorescence in estimating water-use efficiency in a temperate forest
MetadataShow full item record
KeywordSolar-induced chlorophyll fluorescence; Water use efficiency; Leaf area index; Observation time; Regression analysis
Water-use efficiency (WUE) is a critical variable describing the interrelationship between carbon uptake and water loss in land ecosystems. Different WUE formulations (WUEs) including intrinsic water use efficiency (WUEi), inherent water use efficiency (IWUE), and underlying water use efficiency (uWUE) have been proposed. Based on continuous measurements of carbon and water fluxes and solar-induced chlorophyll fluorescence (SIF) at a temperate forest, we analyze the correlations between SIF emission and the different WUEs at the canopy level by using linear regression (LR) and Gaussian processes regression (GPR) models. Overall, we find that SIF emission has a good potential to estimate IWUE and uWUE, especially when a combination of different SIF bands and a GPR model is used. At an hourly time step, canopy-level SIF emission can explain as high as 65% and 61% of the variances in IWUE and uWUE. Specifically, we find that (1) a daily time step by averaging hourly values during daytime can enhance the SIF-IWUE correlations, (2) the SIF-IWUE correlations decrease when photosynthetically active radiation and air temperature exceed their optimal biological thresholds, (3) a low Leaf Area Index (LAI) has a negative effect on the SIF-IWUE correlations due to large evaporation fluxes, (4) a high LAI in summer also reduces the SIF-IWUE correlations most likely due to increasing scattering and (re)absorption of the SIF signal, and (5) the observation time during the day has a strong impact on the SIF-IWUE correlations and SIF measurements in the early morning have the lowest power to estimate IWUE due to the large evaporation of dew. This study provides a new way to evaluate the stomatal regulation of plant-gas exchange without complex parameterizations.
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Remote Sensing 10 (2018): 796, doi:10.3390/rs10050796.
Suggested CitationArticle: Lu, Xiaoliang, Liu, Zhunqiao, Zhou, Yuyu, Liu, Yaling, Tang, Jianwu, "Performance of solar-induced chlorophyll fluorescence in estimating water-use efficiency in a temperate forest", Remote Sensing 10 (2018): 796, DOI:10.3390/rs10050796, https://hdl.handle.net/1912/10452
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Comparison of phenology estimated from reflectance-based indices and solar-induced chlorophyll fluorescence (SIF) observations in a temperate forest using GPP-based phenology as the standard Lu, Xiaoliang; Liu, Zhunqiao; Zhou, Yuyu; Liu, Yaling; An, Shuqing; Tang, Jianwu (MDPI AG, 2018-06-13)We assessed the performance of reflectance-based vegetation indices and solar-induced chlorophyll fluorescence (SIF) datasets with various spatial and temporal resolutions in monitoring the Gross Primary Production (GPP)-based ...
Chlorophyll fluorescence tracks seasonal variations of photosynthesis from leaf to canopy in a temperate forest Yang, Hualei; Yang, Xi; Zhang, Yongguang; Heskel, Mary; Lu, Xiaoliang; Munger, J. William; Sun, Shucun; Tang, Jianwu (2016-11)Accurate estimation of terrestrial gross primary productivity (GPP) remains a challenge despite its importance in the global carbon cycle. Chlorophyll fluorescence (ChlF) has been recently adopted to understand photosynthesis ...
DNA damage induces nuclear actin filament assembly by Formin-2 and Spire-1/2 that promotes efficient DNA repair Belin, Brittany J.; Lee, Terri; Mullins, R. Dyche (eLife Sciences Publications, 2015-08-19)Actin filaments assemble inside the nucleus in response to multiple cellular perturbations, including heat shock, protein misfolding, integrin engagement, and serum stimulation. We find that DNA damage also generates ...