Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR029976 |
Root Exudates Alters Nutrient Transport in Soil | |
Amit Paporisch; Harel Bavli; Rachel J. Strickman; Rebecca B. Neumann; Nimrod Schwartz | |
2021-10-05 | |
发表期刊 | Water Resources Research
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出版年 | 2021 |
英文摘要 | Root exudates alter the rhizosphere’s physical properties, but the impact that these changes have on solute transport is unknown. In this study, we tested the effects of chia mucilage and wheat root exudates on the transport of iodide and potassium in saturated or unsaturated soil. Saturated solute breakthrough experiments, conducted in loamy sand soil or coarser textured quartz sand, revealed that increasing the exudate concentration in soil resulted in non-equilibrium solute transport. This behavior was demonstrated by an initial solute breakthrough after fewer pore volumes and the arrival of the peak solute concentration after greater pore volumes in soil mixed with exudates compared to soil without exudates. These patterns were more pronounced for the coarser textured quartz sand than for the loamy sand soil, and in soil mixed with mucilage than in soil mixed wheat root exudates. Parameter fits to these breakthrough curves with a mobile-immobile transport model indicated the fraction of immobile water increased as the concentration of exudates increased. For example, in quartz sand the estimated immobile fraction increased from 0 without exudates to 0.75 at a mucilage concentration of 0.2%. The solutes’ breakthrough under unsaturated conditions was also altered by the exudates, demonstrated by a smaller volume of water extracted from soil mixed with exudates, compared to soil without exudates, before the arrival of the peak solute concentration. The results indicate that exudates alter the rhizosphere’s transport properties; we hypothesize that this is due to exudates creating low-conducting flow paths that result in a physical non-equilibrium solute transport. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/339826 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Amit Paporisch,Harel Bavli,Rachel J. Strickman,et al. Root Exudates Alters Nutrient Transport in Soil[J]. Water Resources Research,2021. |
APA | Amit Paporisch,Harel Bavli,Rachel J. Strickman,Rebecca B. Neumann,&Nimrod Schwartz.(2021).Root Exudates Alters Nutrient Transport in Soil.Water Resources Research. |
MLA | Amit Paporisch,et al."Root Exudates Alters Nutrient Transport in Soil".Water Resources Research (2021). |
条目包含的文件 | 条目无相关文件。 |
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