Analysis on Relationships between Plant Growth and Water Dynamics in Environment-Plant System

点击翻译按钮获取中文摘要

Measurements on plant and water behavior, such as weter transport in plant, water potential in plant, plant leaf growth, mass exchange in root system and etc., were carried out to analyze the relationships between plant growth and water dynamics in plant-environment system. Evaporative demand determined from heat balance in leaf was related linearly with measured transpiration. The evaporative demand was depended more largely on short radiation and air humidity than air temperature and air velocity. From the water balance in whole-plant varing with radiation intensity, it was found that hydraulic conductivity through cell membrane and leaf extensibility, besides turgor pressure, also affected on water content variation in plant, stomatal movement, and leaf growth. These variables responded intensively to light exposure at low evaporative demand. In the root system, resistance to water conduction increased with root temperature. The temperature effect suggests to lead to changes in transpiration of plant. Technique using image processing revealed exponential growth of root length and temperature effects on leaf growth. Using by these obtained knowledge, it would be feasible to optimize environmental conditions for agricultural production.