A lysimeter for automatic monitoring of paddy field soil water and groundwater conversion process

Abstract

The invention relates to a lysimeter for automatically monitoring a conversion process of soil water and underground water in a paddy rice. The lysimeter comprises a lysimeter area, an observation pond, an air pressure adjusting pipe, a pervious pipe, a valve, a filter, a positioning water tank, a positioning water tank guide rail, a valve, a skip bucket water meter, a water supplementing box, a water supplementing opening, a ventilation pipe and a water level gauge, which belongs to the field of agriculture science, and particularly relates to a device for acquiring conversion amount of soil water and underground water in the field. The lysimeter has the beneficial effects that (1) the lysimeter which can precisely measure the conversion amount of the soil water and underground water in the paddy field is provided; (2) the lysimeter can automatically supplement and discharge the water; (3) the underwater supplement amount measurement precision of the lysimeter can reach 0.07 mm; (4) the water leakage amount measurement precision of the lysimeter can reach 0.01 mm; and (5) the water supplementing and water discharging variation following time of the lysimeter is smaller than 5 minutes.

Description

technical field [0001] The invention relates to a lysimeter for automatically monitoring the transformation process of paddy field soil water and groundwater, in particular to a lysimeter for accurately obtaining the conversion amount of paddy field soil water and groundwater and its continuous change process, belonging to the field of agricultural science and technology. Background technique [0002] Technical requirements: Rice is one of the main food crops in my country, and the water consumption for rice irrigation is huge, accounting for more than 65% of the national water consumption. At present, the lack of water resources is increasingly constraining agricultural production, and the traditional rice field irrigation mode has been gradually abandoned by people due to serious water waste. Since the 1980s, my country's rice water-saving irrigation technology has made great progress and has been widely promoted. The water control measures of the water-saving irrigation ...

AI Technical Summary

Problems solved by technology

[0004] Defects of the prior art: but in these experiments only the working principle of the device is given, and the specific design data of the device are not given

Due to the continuous dry-wet cycle in water-saving irrigation paddy fields, the conversion process of soil water and groundwater in paddy fields is more frequent and severe than that in dry land. According to the manual monitoring methods of existing devices, the conversion process of soil water-groundwater in paddy fields cannot be fully reflected within the monitoring period.

At the same time, the characteristics of rice water demand and the large rainfall in the growing season make the water replenishment frequency of paddy fields higher, and the seepage of paddy fields is much larger than that of dry land; Some devices are completely unable to meet the requirements for monitoring the conversion of soil water to groundwater in paddy fields

The water conversion process in paddy fields significantly affects the air pressure and water volume balance in the lysimeter process, and the lysimeter in the prior art can not meet the requirements for the observation of paddy field soil water and groundwater conversion process directly or simply after modification.

The blankness of the test method restricts the in-depth study of the transformation process of soil water and groundwater in water-saving irrigation paddy field and its influencing mechanism

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