| Characteristics of evaporation from perforated plastic film in drip irrigation under film mulching in arid areas |
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| DOI：10.7606/j.issn.1000-7601.2011.01.03 |
| Key Words: hole opening ratio wetness van cumulative evaporation increased salt content accumulated |
| Author Name | Affiliation | | WANG Chunxia | Institute of Water Resources, Xi'an University Technology, Xi'an, Shannxi 710048, China | | WANG Quanjiu | Institute of Water Resources, Xi'an University Technology, Xi'an, Shannxi 710048, China
State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shannxi 712100, China | | ZHUANG Liang | Xinjiang Institute of Water Conservation and Hydraulic Power, Wurumqi, Xinjiang 830049, China | | SHAN Yuyang | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, Shannxi 712100, China | | ZHANG Ming | Xinjiang Institute of Water Conservation and Hydraulic Power, Wurumqi, Xinjiang 830049, China |
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| Abstract: |
| Plastic film mulching has been widely used in crop planting in arid areas, but due to the seeding holes and other factors, entire mulching can not be performed in the field, and this must affect the distribution of soil water and salt content. Evaporation was simulated with different holes opening ratio to study the dynamic distribution characteristics of wetness van and soil water and salt transfer with different holes opening ratio in evaporation process. The results indicated that vertical wetness distances were increasing with the elongation of evaporation time, and the increment was the biggest aft
er a day of evaporation; The vertical wetness distances were depressed with holes opening ratio increasing at the end of evaporation. The soil water content was
inducing with the extension of evaporation time, it was the most rapid in the top layer, but it increased in the bottom of soil profile; The soil salt content was increasing in top and bottom layers. At the end of evaporation the soil water content was reducing with hole opening ratio increasing at the same profile position, but the increased salt content accumulated at top layer was getting higher with hole opening ratio increasing, and the soil salt content of lower profile was moving along inclined below direction, and assembled in the wetness van. There was fine linear relationship between cumulative evaporation and evaporation time, and there was also powerful function relationship between cumulative evaporation increment and open holes ratio. |
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