Roots at the percolation threshold.

Roots at the percolation threshold.
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根系处于渗滤阈值

DOI:
10.1103/physreve.91.042706
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发表时间:
2015
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
通讯作者:
Carminati A
Carminati A
中科院分区:
--
文献类型:
--
作者:
Kroener E;Ahmed MA;Carminati A

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根际是根部周围的土层,植物与土壤之间复杂而动态的相互作用影响植物吸收水分的能力。根际的物理性质受到粘液的影响,粘胶是一种由根部渗出的凝胶。粘液可以吸收大量的水,但干燥后变得疏水性。我们使用渗流模型来描述干燥根际的再湿。我们发现,在临界粘液浓度下,根际变得不透水。临界粘液浓度取决于土壤颗粒的半径。中子照相毛细上升实验证明,当粘液浓度低于临界浓度时,水很容易通过根际,而高于临界浓度时,水不能再渗入根际。我们的研究结合以前对根际水分动态的观察表明,根际处于渗滤阈值附近,粘液浓度的微小变化敏感地改变了土壤的水力传导性。粘液分泌是否是有效控制根际电导率和获得水分的植物机制?
The rhizosphere is the layer of soil around the roots where complex and dynamic interactions between plants and soil affect the capacity of plants to take up water. The physical properties of the rhizosphere are affected by mucilage, a gel exuded by roots. Mucilage can absorb large volumes of water, but it becomes hydrophobic after drying. We use a percolation model to describe the rewetting of dry rhizosphere. We find that at a critical mucilage concentration the rhizosphere becomes impermeable. The critical mucilage concentration depends on the radius of the soil particle size. Capillary rise experiments with neutron radiography prove that for concentrations below the critical mucilage concentration water could easily cross the rhizosphere, while above the critical concentration water could no longer percolate through it. Our studies, together with former observations of water dynamics in the rhizosphere, suggest that the rhizosphere is near the percolation threshold, where small variations in mucilage concentration sensitively alter the soil hydraulic conductivity. Is mucilage exudation a plant mechanism to efficiently control the rhizosphere conductivity and the access to water?
液压触点控制流经多孔颗粒的水流。
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发表时间: 2007
期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子: --
作者:
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DOI: --
发表时间: 1998
期刊:
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影响因子: 5.6
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DOI: --
发表时间: 1997
期刊:
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