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Understanding the physical constraints of soil structure and its influence on soil hydraulic properties.

机译：了解土壤结构的物理约束及其对土壤水力学特性的影响。

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摘要

This research explores the application of multistripe laser triangulation (MLT) three-dimensional scanning to better understand soil structural constraints and predict soil hydraulic properties. Study sites for this work were located in Northeast Kansas, and split between the University of Kansas Field Station and the Kansas State Konza Prairie Biological Station. At each site, descriptions were made, soils were sampled, and profiles were scanned in situ using MLT. This thesis addressed two questions. First, do physical properties constrain the expression of soil structure? Particle-size distribution, organic carbon, and coefficient of linear extensibility were the physical properties examined and each appeared to constrain various aspects of soil structure. Second, can the soil hydraulic properties of field capacity, permanent wilting point, inflection point, and saturation water contents, saturated hydraulic conductivity, and effective porosity be predicted from MLT-quantified metrics of soil structure? Soils were equilibrated to a range of pressure potentials to generate water retention data for each site and hydraulic parameters were estimated from curves fitted to the data. These parameters were regressed against soil structural metrics to create structure-based pedotransfer functions for hydraulic properties. Results indicated that soil structural metrics can be used to successfully and accurately predict soil hydraulic properties.
机译：这项研究探索了多条纹激光三角测量（MLT）三维扫描的应用，以更好地了解土壤结构约束并预测土壤水力特性。这项工作的研究地点位于堪萨斯州东北部，位于堪萨斯大学野外站和堪萨斯州Konza草原生物站之间。在每个站点进行描述，对土壤进行采样，并使用MLT现场扫描剖面。本文提出了两个问题。首先，物理性质是否会限制土壤结构的表达？粒度分布，有机碳和线性延伸系数是所考察的物理性质，似乎都限制了土壤结构的各个方面。其次，是否可以通过MLT量化的土壤结构指标来预测田间持水量，永久萎wil点，拐点和饱和水含量，饱和导水率和有效孔隙率的土壤水力学特性？将土壤平衡到一定范围的压力潜力，以生成每个站点的保水数据，并根据拟合数据的曲线估算水力参数。将这些参数与土壤结构指标进行回归，以创建基于结构的水力传递性能。结果表明，土壤结构指标可用于成功，准确地预测土壤水力特性。

著录项

  • 作者

    Bents, Timothy Carl.;

  • 作者单位

    University of Kansas.;

  • 授予单位 University of Kansas.;
  • 学科 Soil sciences.;Hydrologic sciences.
  • 学位 M.S.
  • 年度 2015
  • 页码 75 p.
  • 总页数 75
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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