Trees in arid regions often limit their natural distribution and growth due to insufficient soil water supply. In the SPAC system, the growth and development of plants is always in the environmental constraints. The change of environmental moisture conditions directly affects the plant water status, and then affects the plant's life activities. The transport of water in the plant is determined by the free energy of the water, which is represented by the level of water potential, and the level of the water potential reflects the ability of the plant's physiological activities. The lower the water potential of the plant tissue is, the stronger the water absorption capacity is, and the weaker the water absorption capacity is, on the contrary, according to this principle, the water potential measured by the plant water potential meter can reflect the degree of drought and drought resistance of the plant. Add Wechat to browse professional information anytime, anywhere: Truck Air Conditioner,Dc Powered Air Conditioner,Auto Air Conditioner,Auto Air Conditioner XINXIANG HUATI REFRIGERATION CO., LTD , https://www.trustht.com
When the soil is continuously dry, the leaf water potential of the young tree of Robinia pseudoacacia increases with the degree of drought stress. When the drought lasts for 45 days, the leaf water potential under different degrees of drought changes, the soil relative water content is 40%. At 52%, as the drought duration continued to increase, the water potential gradually decreased; when the relative soil moisture content was 70% and 88%, the water potential of the Robinia pseudoacacia leaf gradually increased as the drought duration prolonged.
The general trend of the water potential change of water stress of Robinia pseudoacacia leaf was basically the same as that of normal water supply. It showed that the leaf water potential was higher in the early morning and then gradually decreased, reached the lowest point around 12:30, and then gradually increased. After re-hydration, the water potential began to decline, and then it gradually increased, showing a clear upward trend. After 24 hours of rewatering, the water potential of the seedlings of Robinia pseudoacacia rose back to the control level, and the subsequent changes in water potential tended to be gradual, and the water potentials of the treatments at 48 h were gradually increased. Almost consistent. Among them, the relative soil moisture content was 70% and the drought duration was closest to the control level at 45 days.
Plant water potential analyzer has been an important indicator for studying water deficit in plants. Existing research results show that soil moisture has a significant impact on the water potential of the Robinia pseudoacacia leaves. This experiment also shows that the water potential of Robinia pseudoacacia leaf varies to varying degrees after drought stress. After the rewatering, the leaf water potential returned to the control level. Under different drought stress conditions, the response of the water potential of the Locust leaves was different. Moderate stress was beneficial to the compensation effect of plant water. 