| Soil moisture consumption and replenishment in winter wheat land under the conditions of precipitation change in loess plateau |
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| DOI：10.7606/j.issn.1000-7601.2018.04.23 |
| Key Words: loess plateau, precipitation change, soil water storage, winter wheat |
| Author Name | Affiliation | | CUI Ya-qiang | State Key Laboratory of soil erosion and dryland agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China. College of Ｒesources and Environment，Northwest A＆F University，Yangling 712100，China | | ZHU Yuan-jun | State Key Laboratory of soil erosion and dryland agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China. College of Ｒesources and Environment，Northwest A＆F University，Yangling 712100，China
Institute of soil and water conservation, Chinese Academy of Sciences, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The soil water consumption and replenishment was the combined action of crop water use and precipitation, it was possessed important value for estimation and prediction of soil water resources. In this paper through the artificial real-time precipitation allocation experiment, has researched the soil water change rate, consumption depth and soil water balance status under three precipitation conditions as: normal precipitation (RCK), precipitation increased 1/3 (R+1/3) and precipitation decreased 1/3 (R-1/3) of winter wheat land in loess plateau. The results indicated that: The soil water storage in 0~3.8 m depth was reduced with the velocity of 91.85mm·a-1 and 109.39mm·a-1 for the treatments of RCK and R-1/3, but for the treatment of R+1/3, Soil water storage decreased at the speed of 48.94 mm·a-1 within 0~3.0 m depth and increased within 3.0~3.8 m depth with the velocity of 17.39 mm·a-1. Increasing of precipitation makes the supply of soil moisture more frequent, thus reducing the temporal and spatial variation of soil moisture. When the soil water content before sowing was sufficient and the precipitation in growing season was more rich, the soil water consumption depth for each treatment was shallower, on the contrary, the consumption depth was deeper. During fallow period, the transformation efficiency of precipitation with the soil water consumption rate was appeared an extremely significant exponential correlation. |
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