TEMPESTX flux summary

Experiment

TEMPESTX is a small-scale soil exclusion experiment nested within the larger TEMPEST flood plots.

• Three flood plots (40 m x 50 m) separated by 5-50 m
• Four groups of exclusion plots (each 0.75 m2?)
• Each group has four plots (1 control, 1 disturbance control trenched with no barrier, 1 trenched and lined with 1 µm mesh, 1 trenched and lined with 45 µm mesh)
• Plots separated by 2-5 m; plot groups separated by 5-20 m
• Exclusion plots installed in February 2020

QA/QC

Bad collar numbers

File	Collar

Out-and-out errors

Data0 (raw data) has 4093 observations.

We have 299 observations with CO2 flux of exactly zero. Removing.

We have 15 observations with CO2 flux less than zero. Removing.

We have 58 observations with LI-8100 error flags. Removing.

Data1 has 3681 observations (89.9% of raw).

Model fit

We have 228 observations with CO2 fit R2 less than 0.5. Not removing but FYI.

We have 1465 observations with CH4 fit R2 less than 0.5. Not removing but FYI.

Outliers

Restrict data to 99%.

The [0.005, 0.995] quantiles of Flux_CO2 are 0.477, 53.427. Changing the 38 values outside of this to NA.

The [0.005, 0.995] quantiles of Flux_CH4 are -8.723, 2.247. Changing the 38 values outside of this to NA.

Overview

Data summary

Something	Something else
First date	2020-04-15 14:14:06
Last date	2021-09-28 11:08:22
N (obs)	3681
N (rounds)	50

Name	Piped data
Number of rows	3681
Number of columns	12
_______________________
Column type frequency:
numeric	12
________________________
Group variables	None

Variable type: numeric

skim_variable	n_missing	complete_rate	mean	sd	p0	p25	p50	p75	p100	hist
File	0	1.00	27.36	14.94	1.00	14.00	28.00	40.00	51.00	▇▆▆▇▇
Obs	0	1.00	1.49	0.50	1.00	1.00	1.00	2.00	2.00	▇▁▁▁▇
Flux_CO2	38	0.99	9.16	8.61	0.48	2.84	6.56	12.36	53.05	▇▂▁▁▁
Flux_CH4	38	0.99	-1.04	1.35	-8.71	-1.34	-0.53	-0.20	2.24	▁▁▁▇▁
Soil_c	1	1.00	0.02	0.02	-0.01	0.00	0.02	0.03	0.08	▆▇▇▂▁
Soil_m	1	1.00	0.27	0.18	-0.16	0.09	0.32	0.41	0.59	▁▆▃▇▃
Soil_t	1	1.00	19.57	6.50	0.20	16.20	20.50	24.90	30.10	▁▂▅▇▇
Length	0	1.00	59.52	1.28	8.00	59.00	60.00	60.00	60.00	▁▁▁▁▇
R2_CO2	0	1.00	0.84	1.16	-67.20	0.83	0.96	0.99	1.00	▁▁▁▁▇
R2_CH4	0	1.00	-6.45	101.39	-4704.31	0.08	0.67	0.91	1.00	▁▁▁▁▇
file_structure_prob	0	1.00	0.14	0.39	0.00	0.00	0.00	0.00	2.00	▇▁▁▁▁
Group	0	1.00	6.22	3.46	1.00	3.00	6.00	9.00	12.00	▇▅▅▅▆

Notes to self - things to qa/qc:

• Zero CO2 flux observations
• CO2 flux outside of 95% envelope (currently = 0, 32.4)
• CH4 flux outside of 95% envelope (currently = -5.7, 0.3)
• Ditto for t, m, c
• Distribution of R2 values
• File with structural issues
• Records with Licor err values

Fluxes

Collar fluxes over time

CO2

CH4

Treatment fluxes over time

CO2

CH4

Temperature and moisture

CO2

Nonlinear model fits for

\(f = R_{10} * Q10^{(T - 10) / 10}\)

Treatment	term	estimate	std.error	statistic	p.value
Disturbance	r10	4.356	0.414	10.531	0
Disturbance	q10	2.297	0.150	15.304	0
Control	r10	4.556	0.399	11.416	0
Control	q10	2.210	0.133	16.596	0
1 µm	r10	3.047	0.351	8.692	0
1 µm	q10	2.163	0.173	12.518	0
45 µm	r10	3.274	0.325	10.079	0
45 µm	q10	2.217	0.151	14.693	0

CH4

LI-8100

We have 23648 LI-8100 observations.

Data summary

Plot	Collar	n
Control	13	4107
Control	14	4107
Control	15	4107
Control	16	4106
Fresh	41	1170
Fresh	42	1170
Fresh	43	1170
Fresh	44	1170
Salt	29	637
Salt	30	637
Salt	31	634
Salt	32	633

Outliers

Restrict data to 99%.

The [0.005, 0.995] quantiles of Exp_Flux are 0.37, 44.356. Changing the 236 values outside of this to NA.

Fluxes over time

7810-8100 comparison