| Effects of different dripper discharges on soil water infiltration/redistribution under drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2016.02.36 |
| Key Words: drip irrigation water redistribution characteristic value of wetted body moist ratio water content of soil |
| Author Name | Affiliation | | ZHANG Zhi-gang | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830000, China | | LI Hong | Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830000, China | | LI Jiang | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | CHENG Ping | Xinjiang Academy of Forestry Sciences, Urumqi, Xinjiang 830000, China | | LIU Bang | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | LI Chang-cheng | Forestry and Horticulture College, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| The objective of the study was conducted to investigate the variations of different dripper discharges on the characteristic values of the wetted body under sand soil in the Jujube demonstration base of Xinjiang Academy of Forestry Sciences. The result showed that when irrigation was stopped, the wetting front performed like a lying semi-ellipsoid. With the increase of the dripper discharge, the distribution range of the wetting front was also increased. 12 hours after irrigation was stopped, soil moisture transport under each dripper discharge was redistributed. The wetting front resembled an upright semi-ellipsoid after redistribution. The moist body size and shape were affected by the dripper discharge and irrigation amount. There was a significant power function between the horizontal and vertical transport distance and infiltration time with an R2≥0.95. In addition, at early irrigation stage, the migration rate of wetting front in the horizontal and vertical became increased with amount of dripper discharge, and went decreased with irrigation time. The larger the dripper discharge, the greater the infiltration distance ratio. Infiltration distance ratio was decreased with irrigation time. The infiltration distance ratio from an initial value 2-2.27 was gradually reduced to 0.8～0.97 under three dripper flows. Furthermore, with the increase in dripper discharge volume, the volume of moist body and water content of soil became increased as well. Drip distance influenced moisture contour. Soil moisture content reached maximal 40cm below the dripper. After redistribution, the moisture contour became sparse, the horizontal diffusion radius was small, and the vertical redistribution distance was large. |
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