Soil salinity influences the water consumption and hydraulic resistance of crops
2007
Marui, A.(Kyushu Univ., Fukuoka (Japan)) | Hao, A. | Nakano, Y. | Inosako, K.
A pot experiment was conducted to clarify the relationship between water consumption and hydraulic resistances by studying plants grown in soils with 6 different salinity concentrations. To determine the hydraulic resistance of each part of the plant, the water potentials at the leaf, stem, and root were measured by using a psychrometer, and the amount of transpiration was also measured. As the concentration of the NaCl solution was 0.03 mol/l, percentage of the decrease in transpiration was 15.2% compared with the case of distilled water. The decrease percentage compared with distilled water became 43.0% and 53.1% at 0.05 and 0.07 mol/l, respectively. These decreases adversely affected water absorption. Moreover the decreases in transpiration were 59.7% and 63.0% at 0.10 and 0.15mol/l NaCl, respectively. There was a larger decrease in transpiration. Hydraulic resistance is normal if the soil comprises distilled water. Hydraulic resistance increases with soil water concentration. Hydraulic resistance increased rapidly when soil salinity exceeded 0.10mol/l.
Показать больше [+] Меньше [-]