• 论文 •

### 冬小麦、夏玉米叶水势、蒸腾和液态水流阻力的田间试验研究

1. 中国科学院石家庄农业现代化研究所, 石家庄　050021
• 出版日期:1997-11-15 发布日期:1997-11-15
• 基金资助:
国家自然科学基金

### FIELD RESEARCHES ON WATER POTENTIAL, TRANSPIRATION AND RESISTANCE TO WATER FLOW FOR WHEAT AND MAIZE

Zhang Xiying

1. Institute of Agricultural Modernization, CAS, Shijiazhuang 050021
• Online:1997-11-15 Published:1997-11-15

Abstract: Measurements of leaf water potential, evapotranspirtaion and soil evaporation rate, stomatal resistance and soil water contents were made for winter wheat and maize under sufficient water supply conditions in 1995 and 1996. The plant resistance to liquid water flow and its relationship with transpiration rate were calculated and evaluated. The results showed that the resistance was decreasing non linearly with the rising of transpiration rate. The resistance to liquid water flow in winter wheat is higher than that in maize, and also the stomatal resistance of winter wheat is lower, so the plant water condition of maize is more favorable for crop growth than that of wheat, which may be one of the reasons that water use efficiency of maize is higher than that of wheat. For the components of the resistance to liquid water flow, the resistance of root in it plays an important role. Then how to reduce the resistance in root water uptake is a key factors in increasing soil water utilization by plants. Ways for reducing this resistance include: increasing root length density and depth in soil by measures such as modification of soil conditions, water supply patterns and fertilizers; reducing the “junction resistance” to water flow in root systems by breeding new varieties and etc..

• S161