In-situ multipoint collecting device and method of suction-adjustable soil solution

Abstract

The invention discloses an in-situ multipoint collecting device and a method of a suction-adjustable soil solution. The device comprises a leaky pipe, the bottom of which is connected with a ceramic head or a film-type liquid-taking head, a liquid collecting bottle with scales, a multipath venting device, a pressure controlling bottle with scales and a vacuum air pump, wherein the leaky pipe is connected with the liquid collecting bottle with scales; the liquid collecting bottle with scales is connected with the pressure controlling bottle with scales through the multipath venting device; and the pressure controlling bottle with scales is connected with the vacuum air pump. The technical scheme is that the invention can continuously collect a plurality of samples simultaneously, accurately control the vacuum suction used in collecting, and improve the collecting efficiency and the collecting precision, is applicable to in-situ collecting of the soil solution, and has simpleness, reliability and low cost.

Description

technical field [0001] The invention relates to a soil solution collection device, in particular to an in-situ multi-point collection device and method for suction-adjustable soil solution used in greenhouses or in the field. Background technique [0002] Soil solution has become an important research content of soil, plant nutrition, ecological environment and many other disciplines. There are many existing sampling methods, and the common sampling methods include: centrifugation, extraction, replacement column method, filter press, osmometric method, negative pressure method, diffusion method, capillary method, etc., among which the first four belong to the destructive method. destructive sampling, the last four are non-destructive sampling. The destructive sampling method often changes the chemical composition and balance of the soil solution, making it impossible to carry out long-term positioning research; while for non-destructive sampling, the method of in-situ extra...

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Problems solved by technology

The destructive sampling method often changes the chemical composition and balance of the soil solution, making it impossible to carry out long-term positioning research; while for non-destructive sampling, the method of in-situ extraction is generally adopted. At present, many in-situ extraction methods have been developed at home and abroad. Methods and devices for extracting soil solution, such as suction cup method, rhizosphere soil solution sampler, etc., but these methods have their own limitations, such as suction cup method is susceptible to effects such as adsorption and dissolution; rhizosphere The soil solution sampler also has the defect that it has a certain filtering effect on the soil solution, and when these methods are used for multi-point sampling, the required workload is large, the cost is high, and the vacuum suction of the extracted soil solution cannot be accurately controlled, so that The error is large, which affects the accuracy of the test, so there is an urgent need for a convenient and practical non-destructive in-situ multi-point collection device for soil solution

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