Totally closed monitoring device for precision change of weighing lysimeter and evapotranspiration determining system

Abstract

The invention relates to the field of ecological monitoring equipment, in particular to a totally closed monitoring device for precision change of a weighing lysimeter and an evapotranspiration determining system. The totally closed monitoring device for precision change of the weighing lysimeter comprises a closed box and a connecting assembly, wherein the closed box is arranged on the outer sideof the weighing lysimeter in a sleeving manner to enable the weighing lysimeter to be in a closed state, and the connecting assembly can connect the closed box with the weighing lysimeter. The totally closed monitoring device enables the weighing lysimeter to be in a closed state during precision monitoring, and result misjudgment caused by external environment and water vapor exchange influenceis reduced. The evapotranspiration determining system can realize daily monitoring of moisture variation of soil and can rapidly, easily and regularly monitor weighing precision change of the instrument.

Description

technical field [0001] The invention relates to the field of ecological monitoring equipment, in particular to a fully enclosed monitoring device for weighing type lysimeter accuracy change and an evapotranspiration measuring system. Background technique [0002] Weighing lysimeter is a high-precision instrument that measures changes in soil moisture by weighing containers filled with undisturbed soil and vegetation based on the principle of water balance. At present, the weighing lysimeter is often widely used in water conservancy, agriculture, ecology and other fields as an accurate evapotranspiration measurement method, and its observation results provide a scientific basis for calibrating and verifying other methods. According to the size of the caliber, it is usually divided into miniature (cross-sectional area ≤ 0.3m 2 , depth≤1.0m), small (0.3m 2 <Cross-sectional area≤2.0m 2 , 1.0m<depth≤2m) and large (2.0m 2 <Cross-sectional area, 2.0m<depth), etc. Am...

AI Technical Summary

Problems solved by technology

[0003] Due to the complex structure design of the large weighing lysimeter and the long-term placement in the outdoor field, with the increase of the service life and the impact of external force trampled and other factors, the connecting rod, load eccentric wheel, box components, etc. will inevitably have certain deflection. At the same time, the disturbance of the external environment to the normal operation of the lysimeter is also gradually highlighted, such as water vapor and temperature that cause corrosion and oxidation to the metal components of the box, weighing pan, zero counterweight, etc., these factors may cause lysimeter Therefore, regular monitoring of changes in instrument weighing accuracy is essential

However, due to the limited knowledge of the instrument, the instrument users are often unable to detect changes in the weighing accuracy of the instrument, and can only rely on regular monitoring and maintenance by professionals; in addition, the soil surface of the instrument is an open interface, and the soil and the atmosphere are constantly Water vapor exchange, researchers place rated weights on the open interface to monitor whether the weighing accuracy changes, which will be affected by water vapor exchange and cause misjudgment of results

This makes the monitoring of the accuracy change of the lysimeter difficult, costly, time-consuming, and poor in timeliness

Images