| 摘要: |
| 在冬小麦的苗期、拔节期、扬花期,给予两种不同的水分处理(正常灌水和干旱),测定土壤、植物、大气的水势并计算热力学函数。结果表明:正常灌水条件下,不同生育期土壤水的△G比较接近,而干旱条件下土壤水的△G变化幅度较大。植物水的△G随小麦生长发育逐渐降低。无论正常灌水或干旱条件下,3个生育期中土壤水、植物水的△H大小变化趋势与△S变化相同,两者呈极显著相关。随着温度升高,土壤水势、植物叶水势均升高。当含水量降低时,土壤、植物的水势温度效应增高。 |
| 关键词: 土壤-植物-大气连续系统,热力学函数,偏摩尔自由能,偏摩尔焓,偏摩尔熵,水势 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目 |
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| Properties of Thermodynamic Functions and Effecfs of Temperature of Water Regimes in SPAC Under Different Wates Regime |
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Gao Junfeng Bai linlin Zhang Yiping Lin Sichun
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| Abstract: |
| Water potential in soil,plant and atmosphere was measured and the thermodynamics functions were then calculated in two different kinds of water treatments(normal irrigation and drought conditions)during the seedling, shooting and flowering stages of winter wheat. The results indicated that the values of △G of soil water in different growing stages under proper water conditions were quite close while the varying margins of G under drought conditions were great. The values of △G of plant water decreased graduallyw ith wheat growing and developing. The varying tendency of △H of soil water and plant water was the same with that of △S of soil water and plant water in three growing stages under either normal or drought water conditions. Both of them were correlated to each other obviously. Water potential of soil and plant leaves rose as temperature went up. When water content decreased, temperature effects upon water potential of soil and plant would increase. |
| Key words: soil-plant-atmosphere-continuation, thermodynamic function, water potential, partical molar, free energy, partial molar enthalpy, partial molar entropy |
