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Journal of Arid Land

Article Title

Effects of biochar on water movement characteristics in sandy soil under drip irrigation

Authors

Shenghai PU, 1College of Water Resources and Civil Engineering, China Agriculture University, Beijing 100083,China; 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China; 3Key Laboratory of Northwest Oasis Agricultural Environment,Ministry of Agriculture of China,Urumqi 830091,China
Guangyong LI, 1College of Water Resources and Civil Engineering, China Agriculture University, Beijing 100083,ChinaFollow
Guangmu TANG, 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China; 3Key Laboratory of Northwest Oasis Agricultural Environment,Ministry of Agriculture of China,Urumqi 830091,China
Yunshu ZHANG, 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China; 3Key Laboratory of Northwest Oasis Agricultural Environment,Ministry of Agriculture of China,Urumqi 830091,China
Wanli XU, 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China
Pan LI, 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China; 3Key Laboratory of Northwest Oasis Agricultural Environment,Ministry of Agriculture of China,Urumqi 830091,China
Guangping FENG, 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China; 3Key Laboratory of Northwest Oasis Agricultural Environment,Ministry of Agriculture of China,Urumqi 830091,China
Feng DING, 2Institute of Soil Fertilizer and Agricultural Water Saving,Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China

Abstract

Biochar additioncan improve the physical and hydraulic characteristics of sandy soil. This study investigated the effects of biochar on water holding capacity and water movement in sandy soil under drip irrigation. By indoor simulation experiments, the effects of biochar application at five levels (0%, 1%, 2%, 4%and 6%) on the soil water retention curve, infiltration characteristics of drip irrigation and water distribution were tested and analyzed. The results showed thatbiochar addition rate was positively correlated with water holding capacity of sandy soil and soil available water. Within the same infiltration time, with an increasing amount of added biochar, the diffusion distance of the horizontal wetting front (HWF) tended to decrease, while the infiltration distance of vertical wetting front (VWF) initially declined and then rose. The features of wetted bodies changed from "broad-shallow" to "narrow-deep" type. The relationship between the transport distances of HWF and VWF and the infiltration time was described by a power function. At the same distance from the point source, the larger the amount of added biochar, the higher the soil water content. Biochar had a great influence on the water content of the layer with biochar (0–200mm) and had some effects at 200–250mm without biochar;but it had less influence on the soil water content deeper than250mm. For the application rate of biochar of 4%, most water was retained within 0–250mm soil layer. However, when biochar application amount was high (6%), it would be helpful for water infiltration. During the improvement of sandysoil, biochar application rate of 4% in the plow layer had the best effect.

Keywords

biochar; sandy soil; water holding capacity; water movement; drip irrigation

First Page

740

Last Page

753

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