Automatic minitype lysimeter suitable for sandy soil

Abstract

The invention relates to an automatic minitype lysimeter suitable for sandy soil. The automatic minitype lysimeter comprises a soil sampler and an automatic measuring and recording system, wherein the soil sampler is composed of an outer sleeve pipe, an inner sleeve pipe, a steel wire gauze interlayer and the like; a plurality of guide grooves are formed inside the outer sleeve pipe, and a steel pull wire and a guide ring are arranged in each guide groove; a cutter ring is reserved at the lower part of the outer sleeve pipe, so that the sampler can enter the soil smoothly; and the upper edge of the cutter ring and the inner wall of the inner sleeve pipe are leveled, so that the inner sleeve pipe is prevented from soil resistance; and the automatic measuring and recording system is composed of a precise balance, an outer support, an inner support, a steel hoisting rope, a pulley system, a hanging bracket ad the like. The automatic minitype lysimeter can provide a small-perturbation soil sampling method suitable for sandy soil, the soil sample does not need to be taken out for weighting during measurement and can be in-situ observed; an automatic metering mode is adopted wholly and the soil sample can be observed continuously; and the outer layer of the sampler is of a lattice structure, and the boundary effect of the traditional small lysimeter is weakened.

Description

technical field [0001] The invention relates to an automatic miniature lysimeter suitable for sandy soil. Background technique [0002] The lysimeter (Lysimeter for short) is a systematic, easy-to-use advanced automatic observation device developed for farmland hydrology research in the fields of electronic technology, soil physics and microclimate, in order to conveniently and effectively measure the evapotranspiration of plants. instrument. The instrument is mainly used to test the total water lost by the evaporation of farmland soil moisture and crop transpiration, the amount of soil seepage, rainfall, lingering water and dry and wet deposition in dusty weather. At present, the research and development of lysimeters at home and abroad mainly include liquid buoyancy balance lysimeters, mechanical lever lysimeters, pressure sensor weighing lysimeters, etc. Their common feature is to use sensors to measure soil moisture weight changes caused by evaporation, evapotranspirat...

AI Technical Summary

Problems solved by technology

But the investment is large, it is not convenient to move, and the supporting equipment is complicated

In addition, the small lysimeter is easy to arrange, easy to move, can measure at multiple points, less investment, easy to install, but its accuracy is low, it is easily disturbed by the external environment, the boundary effect is obvious, and continuous measurement is not possible

The soil extraction method of the existing micro lysimeter is relatively backward, and the disturbance to the soil is relatively large

Especially for sandy soils in arid and semi-arid regions, the soil moisture content is inherently low and the soil texture is loose, sometimes difficult to sample in drier conditions

Moreover, the existing miniature lysimeters are not suitable for in-situ continuous observation

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