Abstract
Freezing and thawing action is a particular mechanism of soil salinization in the northwestern arid and cold area. Taking Inner Mongolia Hetao Irrigation District as an example, based on the observed field data, the variation laws of soil temperature, soil moisture and soil salt during freezing and thawing period were analyzed. Results show that the variation laws of soil temperature at the different soil layers are consistent. Variation of soil temperature lags to air temperature. With the soil depth increasing, lag interval increases also. Decrease of air temperature results in that of soil temperature, which leads to water and salt transfer. Temporal variability coefficient of salt(0.30~0.85) is larger than that of water(0.02~0.40). Salt transfer mechanism is more complex than water transfer mechanism. Research provides the foundation for the water-heat-salt coupling simulation on freezing-thawing soils and the establishment of autumn irrigation schedule in Hetao Irrigation District.
| Original language | English |
|---|---|
| Pages (from-to) | 70-74 |
| Number of pages | 5 |
| Journal | Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering |
| Volume | 23 |
| Issue number | 4 |
| Publication status | Published - Apr 1 2007 |
Keywords
- Autumn irrigation
- Coupling transfer
- Freezing and thawing soils
- Hetao Irrigation District
- Water-salt
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Mechanical Engineering