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Effect of stand origin and slope position on infiltration pattern and preferential flow on a Loess hillslope

机译：支架起源和斜坡位置对黄土山坡渗透模式和优先流动的影响

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摘要

Preferential flow is expected to provide an important pathway to replenish soil water at deep soil layers in arid or semiarid areas; however, few studies have addressed this topic, especially in semiarid Loess hillslopes. This study aimed to quantify the effect of stand origin and slope position on the contribution of preferential flow to total infiltration and spatial variations in water flow. A blue dye tracer experiment was conducted to visualize water flow in Robinia pseudoacacia plantation (PL), natural forestland (NF), and natural grassland (NG) at the upslope, midslope, and downslope, and semivariance analysis was used to determine spatial variability at the centimeter scale. The results showed that role of macropore flow was dominant in upslope and midslope, and larger in NF than that in PL and NG, due to presence of abundant root systems in the upper soil of NF. Moreover, contribution of preferential flow at the upper slope in NF was larger than that in PL. At the downslope, the role of rock fragments coverage at the downslope was emphasized, leading lateral flow dominant at the downslope in PL and NG. In addition, contribution of preferential flow and vertical variability of infiltration at the downslope in PL was higher than that in NF. The findings demonstrate that compared with PL, NF has a more positive impact on increasing infiltration and preferential flow that can replenish deep soil water, and reducing surface runoff and soil erosion. The presence of rock fragments coverage can make lateral flow dominant at the downslope on the Loess hillslope, related to water movement along the slope toward streams and catchment outlets.
机译：预期优先流量提供了一个重要的途径，可以在干旱或半干旱地区的深层土壤中补充土壤水分;然而，很少有研究已经解决了这一主题，特别是在半干旱黄土山坡上。本研究旨在量化立场和坡度位置对优先流动对总渗透的贡献的影响和水流动的空间变化。进行了一种蓝色染料示踪实验，以在UPSLOPE，中腹板和下坡的上升流域（NF），天然草地（NF）和天然草地（NG）中的水流来显示水流，使用半决赛分析来确定空间变异性厘米级。结果表明，由于NF的上部土壤存在丰富的根系，巨孔流动的作用在上层流动和中间流动，并且在NF中的较大，并且在PL和NG中较大。此外，NF中的上斜率在上斜率处的优先流量的贡献大于PL中的优先流量。在下坡，强调了岩石碎片覆盖范围的作用，在PL和NG的下坡处占据主导地位。此外，Pl下坡渗透在PL下渗透的优先流量和垂直变化的贡献高于NF。结果表明，与PL相比，NF对提高渗透和优先流量的渗透和优先流量的比较更积极，降低表面径流和土壤腐蚀。岩石碎片的存在覆盖物可以在黄土山坡上的下坡上占据横向流动，与沿着朝向流和集水区的坡度的水运动有关。

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  • 来源
    《Land Degradation and Development》 |2018年第5期|共13页
  • 作者

    Mei Xuemei; Zhu Qingke; Ma Lan; Zhang Dong; Wang Yu; Hao Wenjing;

  • 作者单位

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Key Lab State Forestry Adm Soil &

    Water Conservat Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;
  • 关键词

    dye tracer; infiltration pattern; Loess hillslope; preferential pathway; semivariogram;

    机译：染料示踪剂;渗透图案;黄土山坡;优惠途径;半变形镜;

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