Dynamic Characteristics and Drainage Assessment of Deep Soil Profile in North China Plain Typical Irrigated Farmland
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Abstract:
This experiment depended on the deep soil water profile observation system in Luanchen experimental station, using neutron moisture viewer to observe the soil water content on 15.4 meter soil profile in situ for one continuous year. Combine with the deep soil ahd water sample collection test at regular interval, analysised the dynamic changes of soil water and quantitated the drainage volume in deep soil layer. The follow results showed that the distribution charactoristics of soil moisture were controled by soil texture and it fluctuated with the influence of precipitation and irrigation event. The variability of soil moisture decreasing along with the increasing soil depth. With the influence of precipitation (irrigation) and evapotranspiration, dramatic variations of soil moisture occurred in the root zone. However, response to the precipitation for the soil moisture below the root zone was delayed. The soil water contents were surplus in the whole soil profile (15.4 meter) during the observation period and the gained soil water storage were 216 mm. Nevertheless, the soil water contents lost in the wheat seasons and the soil water storage depleted 208 mm. Based on the chloride mass balance method, the deep drainage were estimated. It was almost 65 mm soil water that percolated through the soil layer which beneath the 560 cm depth.
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