| Study of soil evaporation influenced by introducing different depths of rainwater |
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| DOI：10.7606/j.issn.1000-7601.2019.02.09 |
| Key Words: soil moisture rainwater receiving depth evaporation variation |
| Author Name | Affiliation | | WANG Jun-peng | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China | | REN Xiao-long | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China | | CAI Tie | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Peng | College of Agronomy, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Jiu-cheng | Hanzhong Agricultural Product Quality and Safety Monitoring and Inspection Center, Hanzhong, Shaanxi 723000, China |
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| Abstract: |
| Through a simulation test with an evaporator, the rainwater was introduced into different depths below the surface to study the evaporation of soil moisture. The dynamic changes of soil water evaporation intensity, evaporation rate and evaporation were investigated to determine the impact of rainwater being introduced into various depths below surface on the soil water evaporation.The results showed that the increase in depth of introducing rainwater in to soil greatly reduced the evaporation capacity of soil water. When the depth of introduced rainwater (H) was at 30 cm,the evaporation capacities were 1.6, 1.3 mm·d-1 and 0.9 mm·d-1 with precipitations (P) at 30, 20 mm and 10 mm，respectively, which corresponded to 21.02%, 15.85% and 12.98% of the evaporation capacity when the rainwater was received on the surface. The total evaporation of soil moisture was related to the depth and precipitation that the rainwater was received. With the increase of time and the depth under the same conditions, the evaporation increased with the increase in rainfall. When the ground received rain, soil water evaporation was logarithmically correlated with time (R2=0.9959); When the depth of introducing rainwater at 30 cm, the soil water evaporation was linearly correlated with time (R2=0.9924).The P10H0, P10H10, P10H20 and P10H30 treatments had evaporation rates of 141.14%, 109.03%, 49.16% and 24.75% in day 18, respectively,which indicated that the depth played an important role in reducing the evaporation. Evaporation rate was also related to precipitation that the increase inprecipitation reduced evaporation rate, when the rainwater accepted depth was 20 cm and the precipitation was 10, 20 mm and 30 mm, the evaporation rate in 6 days were 26.76%,13.57% and 9.71%, respectively. |
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