Physical properties of a sandy soil as affected by incubation with a synthetic root exudate: Strength, thermal and hydraulic conductivity, and evaporation.
Physical properties of a sandy soil as affected by incubation with a synthetic root exudate: Strength, thermal and hydraulic conductivity, and evaporation.
复制标题
与合成根渗出孵育影响的沙质土壤的物理特性：强度，强度和液压电导率以及蒸发。
DOI：
10.1111/ejss.13007
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发表时间：
2021-03
影响因子：
4.2
通讯作者：
Ren T
中科院分区：
文献类型：
--
作者：
Zhang W;Gao W;Whalley WR;Ren T
植物根系释放各种有机物质，这些物质可以改变土壤结构，影响热量和质量传递过程。研究了人工根系分泌物（SRE）对桑迪土壤水分蒸发、导水率（k）、导热系数（λ）、电导率（PR）的影响。将与蒸馏水或SRE混合的土壤样品以指定的体积密度和含水量填充到柱中，并在18°C下孵育7天。在干燥过程中监测土壤PR、λ、k和蒸发速率。与用水培养的样品相比，用SRE培养的样品具有可见的菌丝，更大的PR（0.7-5.5 MPa，含水量范围为0.11至0.22 m3 m−3）和λ（0.2-0.7 W m−1 K−1，从0.05至0.22 m3 m−3），并且在潮湿区域增加k，但在干燥区域减少k。SRE处理还降低了土壤水分蒸发速率和累积失水量。X射线计算机断层扫描（CT）分析显示，SRE处理的样品具有更大比例的小孔（<60 μm）。这些变化主要归因于SRE刺激的微生物活性。研究了人工根系分泌物（SRE）培养桑迪土壤对土壤物理性质和蒸发的影响。SRE孵育增加了小孔的分数。SRE培养增加了土壤的电阻率和热导率。土壤导水率在湿润区增加，但在干旱区减少。SRE培养降低了总蒸发速率和累积失水量。
Plant roots release various organic materials that may modify soil structure and affect heat and mass transfer processes. The objective of this study was to determine the effects of a synthetic root exudate (SRE) on penetrometer resistance (PR), thermal conductivity (λ), hydraulic conductivity (k) and evaporation of water in a sandy soil. Soil samples, mixed with either distilled water or the SRE, were packed into columns at a designated bulk density and water content, and incubated for 7 days at 18°C. Soil PR, λ, k and evaporation rate were monitored during drying processes. Compared with those incubated with water, samples incubated with SRE had visible hyphae, greater PR (0.7–5.5 MPa in the water content range of 0.11 to 0.22 m3 m−3) and λ (0.2–0.7 W m−1 K−1 from 0.05 to 0.22 m3 m−3), and increased k in the wet region but decreased k in the dry region. SRE treatment also reduced the overall soil water evaporation rate and cumulative water loss. Analysis of X‐ray computed tomography (CT) scanning showed that the SRE‐treated samples had a greater proportion of small pores (<60 μm). These changes were attributed mainly to SRE‐stimulated microbial activities. The effects of incubating a sandy soil with a synthetic root exudate (SRE) on soil physical properties and evaporation are examined. SRE incubation increased the fraction of small pores. SRE incubation increased soil penetrometer resistance and thermal conductivity. Soil hydraulic conductivity was increased in the wet region but was reduced in the dry region. SRE incubation reduced the overall evaporation rate and cumulative water loss.
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影响因子：
4.2
作者：
Choudhury BU;Ferraris S;Ashton RW;Powlson DS;Whalley WR
通讯作者：
Whalley WR
影响因子：
4.9
作者：
Carminati, Andrea;Moradi, Ahmad B.;Oswald, Sascha E.
通讯作者：
Oswald, Sascha E.
影响因子：
13.5
作者：
Amano, E;Salvucci, GD
通讯作者：
Salvucci, GD
影响因子：
2.8
作者：
Benard, P.;Zarebanadkouki, M.;Carminati, A.
通讯作者：
Carminati, A.
影响因子：
2.9
作者：
Gao, W.;Ren, T.;Whalley, W. R.
通讯作者：
Whalley, W. R.