土壤容重对红壤水分垂直入渗特性的影响

doi:10.3969/j.issn.1674-8530.16.0294

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Abstract In order to analyze the effect of soil bulk density on soil water infiltration in red loam areas and to apply it to irrigation production, the Jiangxi red loam was taken as the study object. The experiment utilized the one-dimensional water vertical infiltration to simulate how soil bulk density influences the water in red loam. The results show that the wetting front and cumulative infiltration volume and infiltration rate at the same time decreased with soil bulk density increasing. Time had more significant effects on the wetting front migration and accumulative infiltration capacity than the bulk density, and the linear relationship between wetting frag and cumulative infiltration was established. Bulk density had great effect on infiltration in the initial time of infiltration, then the effect gradually weakened in the process of infiltration. Saturated hydraulic conductivity and soil bulk density showed a negative power function relationship. In Green-Ampt model and Philip model, the relative error of saturated hydraulic conductivity is less than 9.62% and the calculation accuracy of the two models is higher when the soil bulk density is more than 1.30 g/cm³. During the redistribution period, the water content at the same soil depth decreases with soil bulk density increasing. The soil water content decreases with the increase of redistribution at the soil depth of 0-50 cm, and the soil bulk density has a significant effect on water content(P<0.05), the soil bulk density has not a significant effect on water content at the soil depth of 50-70 cm. The results provide the theoretical support for crops irrigation in red loam areas.

Key words： red loam soil bulk density vertical infiltration redistribution water content

Received: 29 November 2016

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	ZENG Jian-
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ZENG Jian-,FEI Liang-Jun-,PEI Qing-Bao-^{等. Influence of soil bulk density on soil water infiltration characteristics in water vertical movement for red loams[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(12): 1081-1087.}

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http://zzs.ujs.edu.cn/pgjx/EN/10.3969/j.issn.1674-8530.16.0294 OR http://zzs.ujs.edu.cn/pgjx/EN/Y2017/V35/I12/1081

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