总水势概念的定义、计算及应用条件

景卫华; 贾忠华; 罗 纨

总水势概念的定义、计算及应用条件

1.
西安理工大学水资源研究所，西安 710048
2.
西安理工大学环境研究所，西安 710048

基金项目: 国家自然科学基金资助项目(50209015)；西安理工大学科技创新基金资助项目

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出版历程
- 收稿日期: 2006-08-01
- 修回日期: 2007-11-19
- 发布日期: 2008-02-28

Definition, calculation and application of total water potential

1.
Water Resources Research Institute, Xi’an University of Technology, Xi’an 710048, China
2.
Environmental Research Institute, Xi’an University of Technology, Xi’an 710048, China

摘要

摘要: SPAC系统理论中引入能量观点认为水分运移取决于其驱动力-水势差（即能量差）的大小和水流的阻力。但目前水势定义的本质是等温条件下摩尔吉布斯函数之差，并不能涵盖总能量。该文首先提出“总水势”的概念来表达水分的总能量，按照总能量观点对其进行定义；然后对构成总能量的每个分势进行了分析计算；最后，探讨了总水势的物理意义和限制条件，以了解实际应用中出现的一些误区。
- 水势 /
- 总水势 /
- 吉布斯能势 /
- 摩尔吉布斯能函数 /
- SPAC系统
Abstract: According to the theory of Soil-Plant-Atmosphere Continuum (SPAC), water movement in the SPAC system depends on the driving force -water potential gradient (i.e. energy gradient) and flow resistance. However, the essence of present conception of water potential is the difference value of molar Gibbs function of water under isothermal condition, it does not cover the total energy of water in a considered system. A total water potential concept that expresses total energy of moisture in a given system was proposed, and methods for quantifying each component of the total water potential were presented. Finally, the physical meaning and the limitations of the total water potential were discussed to understand some mistake of total water potential application.
- water potential /
- total water potential /
- Gibbs energy potential /
- molar Gibbs function /
- SPAC

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文章访问数: 1510
HTML全文浏览量: 0
PDF下载量: 1179
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总水势概念的定义、计算及应用条件

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出版历程

Definition, calculation and application of total water potential

计量

出版历程

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