Li, Hongshou ， Li, Fei ， Wang, Shunren
2026-03-12 HYDROLOGICAL SCIENCES JOURNAL 2026 71(卷), 4(期), (707-718页)
According to the results of soil air humidity monitoring experiments, the earth-air activity in extremely arid areas changes frequently. When the atmospheric pressure (AP) drops, the earth-air rises and moist earth-air flows out from the soil. When the AP increases, the earth-air is compressed, and dry atmospheric air flows into the soil. This paper demonstrates earth-air experiments conducted with a specialized device in an extremely arid area. The quantity, characteristics, and regularity of the flux of earth-air were thus determined on daily/yearly time scales. The formation mechanism, main driving sources, and key influencing factors were subsequently investigated. The evaporation of water from the soil is the main reason for the increase in the outflow of earth-air. The earth-air movement is caused by the fluctuation in the AP. The quantitative results for the exchange between earth-air and atmosphere have universal significance for the understanding of land-atmosphere processes, hydrology and geophysics.