| Infiltration response of deep dry soil to rainfall in the Loess Hilly Region |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2021.04.04 |
| Key Words: dry soil infiltration response to rainfall soil moisture Loess Hilly Region |
| Author Name | Affiliation | | WANG Xing | School of Agriculture, Ningxia University, Yinchuan, Ningxia 750021, China | | ZHANG Jingxiao | Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061000, China
China Institute of Water Resources and Hydropower Research, Beijing 100038, China | | LV Wang | Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China | | SHAN Changhe | Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061000, China | | LU Mei | Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061000, China | | LI Yanchao | Hebei University of Water Resources and Electric Engineering, Cangzhou, Hebei 061000, China |
|
| Hits: 643 |
| Download times: 144 |
| Abstract: |
| In order to explore the infiltration response of the deep dry soil to rainfall in the Loess Hilly Region, a large underground soil column of 10 m in the field was set up in Mizhi test station which is located in the North of Shaanxi Province. The BLJW-4 comprehensive meteorological station and CS650-CR1000 automatic monitoring system were used to conduct long\|term and continuous positioning observation of rainfall as well as soil moisture. Results showed that: (1) Rainfall in the loess hilly region should be divided into three types: rapid evaporative rainfall (P≤13 mm), slow evaporative rainfall (13 mm<P<26 mm), and infiltration dominant rainfall (P≥26 mm). Rapid evaporation rainfall and slow evaporation rainfall in the exposed surface situation only triggered response within shallow layers (Zrapid≤30 cm，30 cm<Zslow<60 cm). Both of these two types were unable to supply water to deep dry soil. The infiltration dominant rainfall led to response of deep soil layers (Zinfiltration≥60 cm), which promoted the deep dry soil to get water remediation. (2) 0~90 cm was the rainfall infiltration and evaporation cycle layer. The soil within this depth was strongly affected by rainfall and evaporation, and soil moisture fluctuated frequently in both directions. Infiltration played a leading role below 90 cm. Within this depth, soil was no longer affected by evaporation, and soil moisture showed an increasing trend. (3) The maximum annual infiltration depth of infiltration dominant rainfall was 140~160 cm, and it took about 69~435 h for the upper soil moisture to recover to the level before the rain under the influence of evaporation. Under bare surface conditions, multi\|year accumulation of rainfall promoted the infiltration response of deep dry soil. The infiltration response depths of dry soil to natural rainfall from 2014 to 2019 were 180, 220, 400, 700, 900 cm and >1 000 cm in sequence. |
|
|
|