围垦年限和土壤容重对海涂土壤水分运动参数的影响
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国家自然科学基金资助项目(41471180、51109063)和江苏省高校优秀科技创新团队


Effects of Land Reclamation Time and Soil Bulk Density on Soil Hydraulic Parameters in Coastal Reclamation Region
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    摘要:

    为探讨围垦年限和土壤容重双因素对海涂土壤水分运动参数的影响,在室内试验的基础上结合理论计算,对海涂4个年限围垦区土壤2个不同容重下土壤导水率、水分特征曲线和扩散率的变化进行了研究。结果表明:围垦年限对土壤颗粒组成、结构及钠盐含量等影响显著,土壤饱和导水率随围垦年限的增长而减小;持水能力、土壤水分扩散率随围垦年限的增长而增大。土壤饱和导水率、吸渗率、土壤水分扩散率及相同土壤吸力下的含水率均随容重的增大而减小,随着围垦年限的增长,土壤容重对水分运动参数的影响更明显。

    Abstract:

    In order to investigate the effect of land reclamation time and soil bulk density on soil hydraulic parameters, a study combined laboratory experiments with theoretical analysis was conducted to examine the changes of soil saturated hydraulic conductivity, soil water characteristic curve, and diffusivity with two different bulk densities of four reclamation soils. Results showed that the land reclamation time had significant effects on soil particle component, soil structure, sodium salt content, and so on. Soil saturated hydraulic conductivity decreased with the increase of land reclamation time, while water-holding capacity and soil moisture diffusivity increased with the increase of land reclamation time. Soil saturated hydraulic conductivity, diffusivity and soil water content under the same suction force decreased with the increase of bulk density. With increasing reclamation time, the influences of soil bulk density change on soil hydraulic parameters became more obvious.

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佘冬立,郑加兴,刘营营,高雪梅.围垦年限和土壤容重对海涂土壤水分运动参数的影响[J].农业机械学报,2015,46(2):120-125. She Dongli, Zheng Jiaxing, Liu Yingying, Gao Xuemei. Effects of Land Reclamation Time and Soil Bulk Density on Soil Hydraulic Parameters in Coastal Reclamation Region[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(2):120-125.

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  • 收稿日期:2014-02-08
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  • 在线发布日期: 2015-02-10
  • 出版日期: 2015-02-10