Compensating automatic measurement system and method of soil surface evaporation capacity

Abstract

The invention relates to a compensating automatic measurement system and a method of soil surface evaporation capacity. The system comprises a soil measure apparatus, an evaporating weighing sensor, a negative pressure compensating apparatus and a control apparatus. The soil measure apparatus comprises a chassis, a ceramic plate and soil column cylinder; a water guiding zone is arranged between the chassis and the ceramic plate, and the chassis is provided with a water-guiding hole. The negative pressure compensating apparatus comprises a water supplementing bottle connecting with the water-guiding hole through a pipeline, a negative pressure buffer bottle connecting with the water supplementing bottle through a pipeline, a negative pressure sensor and a negative pressure pump that are connected to the negative pressure buffer bottle successively through pipelines, and a tensiometer ceramic head connecting with another negative pressure sensor. The control apparatus comprises a singlechip, a click circuit, an A / D converter, a data memory device, a communication interface circuit, a power supply and a drive circuit; the A / D converter transmits data collected by the two negativepressure sensors to the singlechip; the click circuit controls time intervals of collecting data from the evaporating weighing sensor and the compensating apparatus and inputs the data to the data memory device through the A / D converter. The invention can be widely applied to measurements of evaporation capacities of various field soil.

Description

technical field [0001] The invention relates to a measurement system and method, in particular to a compensation type automatic measurement system and method for real-time measurement of soil surface evaporation. Background technique [0002] Under the dual constraints of water shortage and ecological environment, agricultural water use must be developed in the direction of water saving and high efficiency. At present, the greatest potential for agricultural water saving in my country lies in the field. Only 1%-2% of the water absorbed by crops is used for the formation of crop organs, and most of the other water is lost in the form of crop transpiration and inter-tree evaporation. It is the main form of water consumption in agricultural production. In order to reduce the ineffective evapotranspiration of field water, it is urgent to obtain real-time and accurate measurement data of field evaporation and improve water use efficiency. However, field evapotranspiration is a ra...

AI Technical Summary

Problems solved by technology

However, the existing micro evaporators mainly use manual weighing, which is time-consuming and labor-intensive. Not only can it not obtain continuous real-time data, but it also has a great impact on the farmland environment.

[0004] At present, the most direct method to measure soil evaporation is to use a large-scale weighing lysimeter to measure the evaporation of bare soil, but using a large-scale weighing lysimeter to measure the evaporation of bare soil is expensive, difficult to install soil, and difficult to maintain regularly and other problems, and the large weighing lysimeter is too bulky to directly measure the evaporation between densely planted crops, only the total amount of evapotranspiration can be obtained

In addition, because the existing micro evaporator is a small evaporation vessel with a bottom cover, the connection between the measured soil and the field soil is separated, and there is no corresponding connection or compensation device, resulting in the internal and external soil of the micro evaporator In order to minimize the difference between the soil inside and outside the micro evaporator, frequent soil replacement is generally adopted, but during the monitoring period, the water potential between the inside and outside soil of the micro evaporator The difference will inevitably lead to large errors in the evaporation measurement data

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