| Experimental study on rainfall infiltration in semiarid region of the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2016.02.35 |
| Key Words: rainfall soil water infiltration recharge mulch |
| Author Name | Affiliation | | BAI Sheng-yuan | College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG You-ke | College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
National Engineering Research Center for Water Saving Irrigation at Yangling, Yangling, Shaanxi 712100, China | | MA Jian-peng | Research Center of Soil and Water Conservation and Ecological Environment, Chines Academy of Sciences & Ministry of Education, Yangling, Shaanxi 712100, China | | WANG Xing | College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHOU Yu-hong | College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The water resource has becoming limited in the Loess Plateau area, and rainfall is the only supply for soil water. In order to study the process of groundwater recharging, regional observation was conducted on soil water of a soil column at 10m depth in Mizhi experimental station. Infiltration depth and amount of groundwater feed were analyzed. The results showed that that by automatic monitoring, the moisture content of soil layers within 0.3 m changed obviously eleven hours after a single precipitation reached 5.2 mm (light rain), while that below 0.3 m exhibited almost no changes. When a single precipitation was 15.8 mm (moderate rain), within four days, the resulting depth could be up to 0.6 m. When a single precipitation was 33.6 mm (heavy rain), the moisture content at 1.2 m soil layer changed obviously and that at 1.4 m became slightly increased in eight days. Water cycle was mainly conducted over 0.8 m of the evaporation zone where soil moisture became evaporated easily. With the increase of soil depth below 0.8 m, variations of moisture content were small and the amplitude level gradually went decreased. Due to influences from multiple factors, the durations of infiltration varied. During the observation period, soil moisture recharging by cover treatment showed that the resulting effects were in the order of the follows: plastic mulching＞gravel＞branch＞bareland. The recharging under each treatment had a linear correlation with rainfall amount. The recharging reached maximum with plastic mulching. |
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