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

环境-植物系统中植物生长与水动态关系分析

• 批准号: 02454089
• 负责人: EGUCHI Hiromi
• 金额: $ 2.43万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-02454089/
• 关键词: Evaporative demand; Growth rate; Heat balance; Controlled environment; Water conductance; Extensibility; Root; Image processing; 葉の生長; 気孔コンダクタンス; 葉温; 風速; 湿度; 水収支; 短波放射; 熱収支式; 環境要素; 通水伝導度; 水プロセス; 蒸散速度; 通水抵抗; 根長

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.

通过对植物水分输送、植物水势、植物叶片生长、根系物质交换等植物与水分行为的测量，分析植物生长与植物-环境系统水分动态的关系。根据叶片热平衡确定的蒸发需求与测量的蒸腾量线性相关。蒸发需求更多地取决于短辐射和空气湿度，而不是空气温度和空气速度。从全株水平衡随辐射强度变化的情况来看，除了膨压之外，通过细胞膜的水力传导性和叶片的伸展性也影响植物的含水量变化、气孔运动和叶片生长。这些变量对低蒸发需求下的光照反应强烈。在根系中，对水传导的阻力随着根部温度的增加而增加。温度效应表明会导致植物蒸腾作用的变化。使用图像处理技术揭示了根长度的指数增长和温度对叶子生长的影响。利用这些获得的知识，优化农业生产的环境条件是可行的。

项目成果

J.Chikushi,S.Yoshida and H.Eguchi: "A new method for measurement of root length by image processing." Biotronics. 19. 129-135 (1990)

J.Chikushi、S.Yoshida 和 H.Eguchi：“一种通过图像处理测量根长的新方法”。

J.Chikushi and H.Eguchi: "A model of leaf growth responding to air temperatures." Biotronics. 20. 65-71 (1991)

J.Chikushi 和 H.Eguchi：“叶子生长响应气温的模型。”

J.Chikushi,S.Yoshida and H.Eguchi: "Application of image processing to measurement of total length in root system.in idem." Pergamon Press,London. 407-411 (1991)

J.Chikushi、S.Yoshida 和 H.Eguchi：“图像处理在根系总长度测量中的应用。同上。”

M.Kitano and H.Eguchi: "Control of evaporative demand on transpiring plants.I.Sensitivities of evaporative demand to environmental factors." Biotronics. 20. 53-64 (1991)

M.Kitano 和 H.Eguchi：“蒸发植物蒸发需求的控制。I.蒸发需求对环境因素的敏感性。”

M.Kitano and H.Eguchi: "Dynamics of whole-plant water balance and leaf growth in response to evaporative demand. II. Effect of change in wind velocity." Biotronics. 21. 50-60 (1992)

M.Kitano 和 H.Eguchi：“响应蒸发需求的全植物水平衡和叶片生长的动态。II. 风速变化的影响。”