In-field weighting type lysimeter for paddy field

Abstract

The invention discloses an in-field weighting type lysimeter for a paddy field. The in-field weighting type lysimeter comprises a lysimeter main body and a monitoring well, wherein the lysimeter main body is connected with the monitoring well through a gathering gallery; the lysimeter main body comprises an outer drum and an inner drum; a gap is arranged between an outer wall of the inner drum and an inner wall of the outer drum; a weighting sensor is arranged at the bottom of the outer drum; the inner drum is arranged on the weighting sensor; a to-be-detected soil layer is arranged in the inner drum; a water filtering layer is arranged at the bottom of the to-be-detected soil layer; a water gathering pipe is arranged at the bottom of the water filtering layer; a Markov bottle, a constant water-level water tank and a leakage metering device are arranged in the monitoring well from top to bottom; the Markov bottle is used for supplying water to the constant water-level water tank; the leakage metering device is connected with the constant water-level water tank through a leakage metering pipe; the top end of the leakage metering pipe is aligned with the constant water-level liquid level; the water gathering pipe passes through the gathering gallery and is communicated with the constant water-level water tank; a data collecting device is arranged in the monitoring well; the weighting sensor is in signal connection with the data collecting device. The lysimeter provided by the invention can be used for monitoring the leakage water and supplying water volume of the soil layer.

Description

technical field [0001] The invention relates to the technical field of lysimeters, in particular to an underground weighing type lysimeter suitable for paddy fields. Background technique [0002] The lysimeter is an important instrument for measuring ground evaporation or evapotranspiration as well as the rate and amount of soil water leakage. The weighing lysimeter reflects the internal moisture by measuring the weight change of the lysimeter and its filled soil. It is the best facility for measuring small-scale evapotranspiration with high precision. Most of the weighing lysimeters currently on the market are only suitable for upland crops, and it is difficult to monitor the changeable relationship between groundwater and soil water such as seepage when paddy fields are flooded and shallow recharge groundwater when there is no water layer. Hence the invention. Contents of the invention [0003] Based on the above problems, the object of the present invention is to prov...

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Problems solved by technology

Most of the weighing lysimeters currently on the market are only suitable for upland crops, and it is difficult to monitor the changeable relationship between groundwater and soil water such as seepage when paddy fields are flooded and shallow recharge groundwater when there is no water layer. invention thus

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