Table 2 Correlation coefficient (R) between the daily average of log10(soil CO2 flux) and environmental parameters, 95% confidence interval of R (R95), and t test and p values for R
Parameter | Degree of freedom | R | R 95 | t test | p value |
|---|---|---|---|---|---|
Barometric pressure | 11,554 | − 0.145 | − 0.162 to − 0.127 | − 15.71 | 0.00 |
Air temperature | 11,554 | − 0.244 | − 0.261 to − 0.226 | − 27.00 | 0.00 |
Air relative humidity | 9847 | − 0.039 | − 0.059 to − 0.019 | − 3.85 | 0.00 |
Precipitation | 10,532 | − 0.077 | − 0.096 to − 0.058 | − 7.91 | 0.00 |
Soil temperature | 11,554 | − 0.125 | − 0.143 to − 0.107 | − 13.51 | 0.00 |
Soil humidity | 11,554 | − 0.124 | − 0.142 to − 0.106 | − 13.48 | 0.00 |
Wind speed | 11,554 | 0.414 | 0.399 to 0.429 | 48.86 | 0.00 |