Measurement of soil temperature and moisture
In parallel with net ecosystem exchange measurements, we measured soil temperature at 10 cm depth in the leaf chamber with two TP3001 electronic thermometers. At the same time, we collected 10 cm soil samples using a 2.5 cm diameter × 10 cm high soil auger, which we collected in an aluminum box, weighed and recorded the wet mass, and then dried at 105 ℃ for 24 h to weigh the dry mass and then calculate the mass water content.