Table 8 Data dictionary for the FunCaB ecosystem light measurement carbon fluxes (dataset vii).
Variable name | Description | Variable type | Variable range or levels | Units | How measured |
|---|---|---|---|---|---|
year | Year of sampling | numeric | 2015 – 2017 | yyyy | defined |
date | Date of sampling | date | 2015-06-30 – 2017-08-01 | yyyy-mm-dd | defined |
siteID | Unique site ID | categorical | Alrust – Vikesland | defined | |
blockID | Unique block ID a combination of site and block | categorical | Alr1 – Vik5 | defined | |
plotID | Unique plot ID is a combination of site, block and treatment | categorical | Alr1B – Vik5RTC | defined | |
treatment | Plant functional groups removed, where F = forbs, G = graminoids, B = bryophytes, C = control, XC = extra control, RTC = VCG graminoid removal | categorical | FGB, FG, FB, GB, G, F, B, C, XC, RTC | defined | |
starttime | Start time of light measurement (UTC + 2) | date_time | 2015-06-30 08:10:30 – 2017-08-01 14:17:10 | yyyy-mm-dd hh:mm:ss | recorded |
stoptime | End time of light measurement (UTC + 2) | date_time | 2015-06-30 08:12:30 – 2017-08-01 14:19:10 | yyyy-mm-dd hh:mm:ss | recorded |
PAR | PAR value of light measurement | numeric | 4.659 – 2555 | µmol m–2 s–1 | recorded |
soiltemp | Soil temperature value of light measurement | numeric | 3 – 23.2 | °C | recorded |
soilmoisture | Soil moisture measurement per plot | numeric | 0 – 76.775 | m3 water×m–3 soil×100 | recorded |
tempK | Air temperature in the chamber during light measurement | numeric | 279.225 – 312.784 | Kelvin | recorded |
vegHeight | Vegetation height | numeric | 0.01 – 27 | mm | measured |
nee | Net ecosystem exchange | numeric | −15.392 – 17.885 | µmol m−2 s−1 | calculated |
rsqd | R squared of slope of linear regression fitting the CO2 concentration versus time | numeric | 0 – 1 | calculated | |
chamber | Carbon flux chamber | numeric | 1 – 2 | defined | |
removal | Pre (2015) or post (>2015) removal treatment. Pre removal is related to the start of the experiment. | categorical | post – pre | defined | |
weather | Weather conditions during data collection | categorical | cloud – Windy | recorded | |
flag | Flag for data quality (x or DROP) | categorical | |||
comment | Comment on measurement | categorical | |||
time | Time in seconds for light measurement | numeric | 0 – 195 | second | recorded |
