flux_fitting_quadratic

fits a quadratic model to the gas concentration over time

internal

Toolbox to process raw data from closed loop flux chamber (or tent)
setups into ecosystem gas fluxes usable for analysis. It goes from a
data frame of gas concentration over time (which can contain several
measurements) and a meta data file indicating which measurement was done
when, to a data frame of ecosystem gas fluxes including quality diagnostics.
Organized with one function per step, maximizing user flexibility and backwards
compatibility. Different models to estimate the fluxes from the raw data are
available: exponential as described in
Zhao et al (2018) <doi:10.1016/j.agrformet.2018.08.022>, exponential as described in
Hutchinson and Mosier (1981) <doi:10.2136/sssaj1981.03615995004500020017x>,
quadratic, and linear. Other functions include quality assessment,
plotting for visual check, calculation of fluxes based on the setup
specific parameters (chamber size, plot area, ...), gross primary production
and transpiration rate calculation, and light response curves.

Joseph Gaudard

fluxible

Ecosystem Gas Fluxes Calculations for Closed Loop Chamber Setup

flux_fitting_quadratic function

<dl><dt>conc_df_cut</dt>
<dd>dataframe of gas concentration over time, cut</dd>
<dt>conc_df</dt>
<dd>dataframe of gas concentration over time</dd>
<dt>f_conc</dt>
<dd>column with gas concentration</dd>
<dt>f_start</dt>
<dd>column with datetime when the measurement started</dd>
<dt>f_fluxid</dt>
<dd>column with ID of each flux</dd>
<dt>t_zero</dt>
<dd>time at which the slope should be calculated</dd></dl>

Arguments

quadratic fit to gas concentration over time — flux_fitting_quadratic

<dl>

<dt>conc_df_cut</dt>
<dd>dataframe of gas concentration over time, cut</dd>


<dt>conc_df</dt>
<dd>dataframe of gas concentration over time</dd>


<dt>f_conc</dt>
<dd>column with gas concentration</dd>


<dt>f_start</dt>
<dd>column with datetime when the measurement started</dd>


<dt>f_fluxid</dt>
<dd>column with ID of each flux</dd>


<dt>t_zero</dt>
<dd>time at which the slope should be calculated</dd>

</dl>

flux_fitting_quadratic: quadratic fit to gas concentration over time

Description

Usage

Value

Arguments