| Effects of biochar on hydraulic characteristics of aeolian sandy soil in Hetian |
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| DOI：10.7606/j.issn.1000-7601.2021.04.03 |
| Key Words: biochar aeolian sandy soil soil water characteristic curve available moisture content hydraulic conductivity |
| Author Name | Affiliation | | YAN Chenxiao | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 8300052, China
Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi, Xinjiang 8300052, China | | HONG Ming | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 8300052, China
Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi, Xinjiang 8300052, China | | QIN Jiahao | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 8300052, China
Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi, Xinjiang 8300052, China | | FU Junjie | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 8300052, China | | LI Haijun | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 8300052, China | | WANG Yun | College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 8300052, China |
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| Abstract: |
| In order to explore the influence of biochar application amount on hydraulic characteristics of aeolian sandy soil in Hetian, 5 biochar application amount treatments were set up, respectively, with the mass ratios (biochar weight/dry soil weight) of 0% (CK), 4% (T1), 8% (T2), 12% (T3), 16% (T4). The relationship between soil moisture and soil suction was obtained by using centrifugation technique. The saturated hydraulic conductivity was obtained by using fixed waterhead method. VG-M combination model was used to fit soil water characteristic curve to explore the effect of biochar on water holding capacity, soil water availability, water release and water conduction of aeolian sandy soil. The results showed that biochar significantly affected the water holding capacity of aeolian sandy soil, changed its internal pore distribution pattern, and impacted on the VG model parameters θs, θr, α, n. With increasing biochar application amount, the field water holding capacity (volumetric water content) increased from 19.42% to 30.64%, the total available moisture content increased from 18.15% to 25.63%, the wilting coefficient increased from 1.27% to 5.01%, and the saturated hydraulic conductivity decreased by 80.93% on average. In the stage of PF=1.8~3.8 (log of soil water suction), the specific water capacity of each treatment was T3>T4>T2>T1>CK. With the same soil moisture content, the unsaturated hydraulic conductivity of each treatment was CK>T1>T2>T3>T4. Change between the ratio of capillary pore and biochar application showed a quadratic function trend. In summary, biochar application improved the pore structure of aeolian sandy soil, increased its available moisture content and reduced its infiltration rate. From the perspective of soil hydraulic characteristics, when biochar was used to improve aeolian sandy soil in Hetian, the suitable application amount of biochar was 12%. |
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