Leaf fluorescence (discontinued)

The effect of increased UV-B radiation on plant stress is monitored indirectly by measuring chlorophyll fluorescence in three series of plots: Controls, plots with a filter excluding UV-B, and filter controls with a film without exclusion of UV-B. Measurements of chlorophyll fluorescence are carried out on Betula nana and Vaccinium uliginosum in a mesic dwarf shrub heath dominated by Empetrum nigrum and with B. nana and V. uliginosum as subdominant species. For further details, please refer to the newest BioBasis manual available at the website.

Data and Resources

This dataset has no data

Additional Info

Field	Value
Source	https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39
Version	1
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	Temporal coverage 1 Temporal coverage start 2008-07-22 Temporal coverage end 2017-08-09
Spatial coverage	{ "coordinates": [ [ [ -51.38, 64.13 ], [ -51.38, 64.13 ], [ -51.38, 64.13 ], [ -51.38, 64.13 ] ] ], "type": "Polygon" }
Station
Collaborator
	Variable measured 1 Variable name Date Variable description Date of measurement Variable unit Text Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Date Variable measured 2 Variable name Time Variable description Time of measurement (local time). Prior to 2023-10-28 West Greenland time zone was UTC -03:00 (UTC -02:00 during day light savings, aka summer time, which is from the last sunday in March to the last sunday in October). After 2023-10-28 West Greenland changed time zone to UTC -02:00 (UTC -02:00 during day light savings aka summer time) Variable unit Hour Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Time Variable measured 3 Variable name Species Variable description Species Betula nana or Vaccinium uliginosumÂ Variable unit Text Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Species Variable measured 4 Variable name Plot Variable description Plot ID Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Plot Variable measured 5 Variable name Treatment Variable description Controls (C), plots with a filter excluding UV-B (F), and filter controls with film without exclusion of UV-B (B).Â Variable unit Text Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Treatment Variable measured 6 Variable name Latitude Variable description Latitude of plot Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Latitude Variable measured 7 Variable name Longitude Variable description Longitude of plot Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Longitude Variable measured 8 Variable name Record No Variable description Record number Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Record+No Variable measured 9 Variable name P. Light Variable description Pre-illumination intensity Variable unit Î¼mol m-2 s-1 Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=P.+Light Variable measured 10 Variable name P. Dur.(sec) Variable description Pre-illumination duration Variable unit s Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=P.+Dur.(sec) Variable measured 11 Variable name Light Variable description Flash intensity Variable unit Î¼mol m-2 s-1 Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Light Variable measured 12 Variable name Gain Variable description Brief measurement to determine likely size of Fo Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Gain Variable measured 13 Variable name Dur.(sec) Variable description Duration of flash Variable unit s Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Dur.(sec) Variable measured 14 Variable name Flash Variable description Number of flashes Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Flash Variable measured 15 Variable name Fo Variable description Fluorescence origin Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Fo Variable measured 16 Variable name Fm Variable description Maximum fluorescence Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Fm Variable measured 17 Variable name Fv Variable description Variable fluorescence (Fm-Fo) Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Fv Variable measured 18 Variable name Fv/Fm Variable description Maximum quantum efficiency Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Fv%2FFm Variable measured 19 Variable name Tfm Variable description Time at maximum Fm Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Tfm Variable measured 20 Variable name Area Variable description Area above fluorescence curve Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Area Variable measured 21 Variable name T1 ms Variable description T1= 50 Î¼s Variable unit Î¼s Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=T1+ms Variable measured 22 Variable name F1 Variable description Fluorescence at T1 Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=F1 Variable measured 23 Variable name T2 ms Variable description T2= 100 Î¼s Variable unit Î¼s Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=T2+ms Variable measured 24 Variable name F2 Variable description Fluorescence at T2 Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=F2 Variable measured 25 Variable name T3 ms Variable description T3= 300 Î¼s Variable unit Î¼s Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=T3+ms Variable measured 26 Variable name F3 Variable description Fluorescence at T3 Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=F3 Variable measured 27 Variable name T4 ms Variable description T4= 2 ms Variable unit ms Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=T4+ms Variable measured 28 Variable name F4 Variable description Fluorescence at T4 Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=F4 Variable measured 29 Variable name T5 ms Variable description T5= 30 ms Variable unit ms Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=T5+ms Variable measured 30 Variable name F5 Variable description Fluorescence at T5 Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=F5 Variable measured 31 Variable name Protocol Variable description Protocol used (0=default) Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Protocol Variable measured 32 Variable name Dark Offset Variable description Dark current measurement artefact Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Dark+Offset Variable measured 33 Variable name RC / ABS Variable description Force due to the concentration of active reaction centers Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=RC+%2F+ABS Variable measured 34 Variable name Fv / Fo Variable description Force of the light reactions Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Fv+%2F+Fo Variable measured 35 Variable name (1-Vj) / Vj Variable description Force related to the dark reactions (after Qa-) Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=(1-Vj)+%2F+Vj Variable measured 36 Variable name PI Variable description Performance indexÂ (PI) Variable unit Number Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=PI Variable measured 37 Variable name Remarks Variable description Remarks Variable unit Text Variable URL https://data.g-e-m.dk/datasets/10.17897/SD1R-RF39#column=Remarks
Measurement Technique
Date published
Status
	Publisher 1 Publisher name Greenland Ecosystem Monitoring Publisher URL https://data.g-e-m.dk