Fig. 4

Time series of environmental parameters from January 2016 to November 2017 for a barometric pressure, b air temperature, c air relative humidity, d precipitation, e soil temperature, f soil humidity, g wind speed, and h wind direction. The black and dark gray circles correspond to data obtained at the soil CO₂ flux station and those obtained at the weather station, respectively. The red line shows the daily average values of the data. The gray crosses and orange dotted line correspond to soil CO₂ flux and its daily average values shown in Fig. 3, respectively