| 木质部水分中微小气泡平衡稳定性的热力学分析 |
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| 引用本文： | 刘文吉,沈繁宜.木质部水分中微小气泡平衡稳定性的热力学分析[J].北京林业大学学报,1997,19(1):21-25. |
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| 作者姓名： | 刘文吉 沈繁宜 |
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| 作者单位： | [1]郑州轻工业学院基础部 [2]北京林业大学基础科学系 |
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| 摘 要： | 该文对植物木质部水分中气泡的平衡稳定性进行了热力学分析．从自由能判据的分析进一步证实了力学平衡所做的初步结论：水势较高、压力势较大时，微小气泡能够达到稳定平衡；当水势降低、压力势达到阈值时，气泡则胀大破裂，形成导管中的空腔；并推导出水分压强阈值公式
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| 关 键 词： | 气泡，压强，水分压强阈值，自由能 |
Thermodynamic Analyses on Equilibrium Stability of Small Bubble in Water of Xylem |
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| Liu Wenji,Shen Fanyi.Thermodynamic Analyses on Equilibrium Stability of Small Bubble in Water of Xylem[J].Journal of Beijing Forestry University,1997,19(1):21-25. |
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| Authors: | Liu Wenji Shen Fanyi |
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| Abstract: | The equilibrium stability of the small bubble in the water of the xylem is studied in the way of thermodynamics. It is analysed in respect both of free energy and force. The results are same. Under high water potential or pressure the small bubble can remain a state of equilibrium stability. When the water potential reduces and reaches a critical value, the bubble expands, then broken down. And a cavity in the tracheid of the xylem is formed. A formula for the critical pressure of water is developed in the paper. |
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| Keywords: | bubble pressure threshold of water pressure free energe |
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