水保所知识产出(1956---)知识库

Acquiring soil hydrothermal information using process-based models is important for agricultural management
in dry alpine regions where in situ data collection is difficult. However, few modeling studies have considered the
soil airflow transport mechanism for arid regions especially, the presence of dry airflow in soil can affect water
and heat transport. Here, we adopt an airflow-coupling hydrological model, Simultaneous Transfer of Energy,
Mass, and Momentum in Unsaturated Soil (STEMMUS), to simulate soil hydrothermal processes and evapo-
transpiration dynamics in a dry farmland on the Tibetan Plateau (TP). The effect of airflow on the simulations
was carefully assessed. Our results suggested that STEMMUS can reliably capture daily observations—the
average values for the index of agreement (d) in the 20–100 cm soil profile were 0.94 for soil temperature, 0.83
for soil moisture, 0.72 for soil evaporation and 0.83 for crop evapotranspiration, respectively, during the vali-
dation period. The impacts of considering airflow transport occurred when water inputs reached 22.8 mm,
showing a positive relationship with increasing precipitation/irrigation. Incorporating airflow in the model
showed minor differences but basically improved the modeling precision for soil moisture (reduction in root
mean squared error (RMSE) values ranging from 0 to 95.9%), evapotranspiration (reduction in RMSE values
ranging from 0 to 97.8%) and evaporation (reduction in RMSE values ranging from 0 to 99.3%) following
rainfall/irrigation events. These findings provide sights into the role of airflow in the complex soil physical
processes, and highlight that rainfall/irrigation inputs are a major factor affecting simulations when airflow is
considered.