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The localized plant water potential pressure chamber is mainly composed of a sensor, a data processing control system, a data display system, a data storage system, and a data transmission system. The sensor is based on foreign sensors and has been technically modified. The remaining four parts are all It is independently developed using domestic components. The instrument has 8 channels, through the data processing control system can set the parameters of the source, data storage, sampling mode, sensor line coefficient, and the collected data at the same time processing; data display system can display real-time instrument process and Measurement results; data storage systems are used to store and transmit data.
The plant water potential pressure chamber was used to measure the diurnal variation of leaf water potential of the four plants, and the performance of the plant water potential pressure chamber and the imported water potential meter was compared. It was concluded that the daily variation trend of the water potential measured by domestic and imported water potential instruments was basically the same; two instruments The results obtained have a good linear correlation with correlation coefficient greater than 0.98 and no significant difference (P<0.001). This shows that the performance of domestic water potential meter reaches the level of imported water potential meter, which can meet the requirements of water potential measurement.
Analysis of performance of plant water potential pressure chamber
In the absence of water resources, water potential is often used as a sensitive indicator to determine plant water deficit. In the water potential of various parts of the plant, the leaf water potential most represents the energy level of the plant water movement and is a direct manifestation of the tissue water status, which determines the water absorption capacity of the plant root system and the canopy's transpiration rate, reflecting the plant's growth season. This kind of physiological activity is constrained by the environmental moisture conditions. The study of plant water potential, especially leaf water potential, has important theoretical significance and application value for revealing the laws of water movement and their mutual relations in SPAC. In particular, it has an important guiding role in the production practices of arid and semi-arid forestry construction planning, tree species selection, and woodland water management. Plant water potential pressure chamber is an important instrument for the determination of plant water potential.