Journal: Journal of Analytical Science and Technology
Article Title: Application of a hand-held supplementary light for extending field-based net ecosystem exchange carbon flux measurements in low light conditions
doi: 10.1186/s40543-025-00496-y
Figure Lengend Snippet: Air temperature measured inside the carbon flux chamber ( T chamber ) during CO 2 measurements. A box plots with the median (black line) and average (red dot) chamber temperatures (with minimum, maximum, median, first quartile, and third quartile) during field measurements across all 28 plots comparing periods of supplementary light (LED), natural light (NL), light shade mesh (S1), dark shade mesh (S2) and dark (Dark) measurements (each over 45 s). The number of replicates was n = 28 each but for the S2 treatment ( n = 16). B Temperature increases inside the flux chamber during laboratory trials testing three different irradiance settings on the torch responding to different photosynthetically active radiation (PAR) levels (400, 800 and 1600 µmol m −2 s −1 ) at three different distances to the light source (30, 50 and 100 cm) and across four different measurement periods (10, 30, 60 and 120 s). Differences in temperature between repeated measurements ( n = 3) for each combination could not be detected as they were less than 0.1 °C (the recorded measurement accuracy of the LI-COR chamber temperature sensor)
Article Snippet: Differences in temperature between repeated measurements ( n = 3) for each combination could not be detected as they were less than 0.1 °C (the recorded measurement accuracy of the LI-COR chamber temperature sensor) The NEE flux measurements under natural light conditions and various shading levels provided a much narrower range of flux versus PAR levels (Fig. A) compared to that with supplementary LED light (Fig. B).
Techniques: