slopes30qua {fluxible} | R Documentation |
Slopes for each flux
Description
Slopes of quadratic fit for each flux with 30 seconds end cut and t_zero of 10 seconds, without quality flags. C(t) = a + bt + ct^2
Usage
slopes30qua
Format
A tibble with 1251 rows and 27 variables
- f_datetime
Datetime at which CO2 concentration was recorded.
- temp_air
Air temperature inside the flux chamber in Celsius.
- temp_soil
Ground temperature inside the flux chamber in Celsius.
- f_conc
CO2 concentration in ppm.
- PAR
Photosynthetically active radiation inside the chamber in micromol/s/sqm.
- turfID
Unique ID of the turf in which the measurement took place.
- type
Type of measurement: ecosystems respiration (ER) or net ecosystem exchange (NEE).
- f_start
Datetime at which the measurement was started.
- f_end
Datetime at which the measurement ended.
- f_fluxID
Unique ID for each flux.
- n_conc
Number of data point per flux.
- ratio
Ratio of n_conc over length of the measurement (in seconds).
- flag
Data quality flags.
- f_time
Time variable of the flux in seconds.
- f_cut
Indicating if the measurement should be kept (keep) or discarded (cut).
- f_pvalue
P-value of the quadratic model of gas concentration over time.
- f_rsquared
R squared of the quadratic model of gas concentration over time.
- f_adj_rsquared
Adjusted R squared of the quadratic model of gas concentration over time.
- f_intercept
Intercept of the quadratic model of gas concentration over time.
- f_param1
b parameter of C(t)
- f_param2
c parameter of C(t)
- f_slope
Slope of the quadratic model of gas concentration over time at t_zero.
- f_fit
Output of the quadratic model of gas concentration over time.
- f_fit_slope
output of linear expression describing the slope at t_zero
Examples
slopes30qua