Flood and drought crop rotation paddy field soil gas in-situ acquiring system and method

A technology for collecting system and soil gas, applied in sampling, measuring devices, instruments, etc., can solve the problems of calculation error of balance time, limit of observation frequency, blockage of diffusion membrane, etc., and achieve the effect of detecting dynamic changes

Inactive Publication Date: 2009-04-22
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

These methods inevitably have sampling system errors, equilibrium time calculation errors, and the resulting observation frequency limitations, etc., and can also cause clogging of the diffusion membrane, etc.

Method used

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  • Flood and drought crop rotation paddy field soil gas in-situ acquiring system and method

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Embodiment

[0030] In the study of the relationship between paddy soil and global change, paddy soil N was studied at the Nanjing Jiangning Experimental Base 2 O.CO 2 .CH 4 Profile distribution characteristics. A total of 24 plots, 27 sets of collection systems were made, and gas samples from 27 soil profiles were collected.

[0031] ①The production of the soil gas in-situ collection system: the materials are commercially available PVC pipes with an inner diameter of 4cm, PVC boards with a thickness of 8mm, nylon pipes with an inner diameter of 4mm, a three-way valve (three-way valve for medical disposable use), silicone tube (silicone medical catheter 4* 6) Wait for processing and production. Choose a PVC pipe with an inner diameter of 40mm and cut it into 50mm as the basic unit. The total length of the collection system is 55cm. A layer of nylon cloth (80-100 mesh) is wrapped to block soil particles and plant roots, and is fixed up and down with copper wires. The gas chambers are s...

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Abstract

The invention relates to a rice field-upland field rotation rice soil gas in-situ acquisition system and an acquisition method thereof, which belongs to the field of the gas acquisition technology and is specially used for the in-situ acquisition of the soil gas in the rice soil section plane under the condition of the rice field-upland field rotation. The invention comprises that: PVC pipes with the 40 mm inside diameter are chosen; total eight pores are uniformly distributed on the exchange interface of the pipe wall at the bottom of every gas cavity; all gas cavities are separated with PVC sheets which are perforated and allow a nylon tube gathering gas to pass through. A nylon slim tube passes through the upper part of the PVC sheets and is connected to a triple valve with a silicone tube. The acquisition method comprises detection of air tightness, installation, pre-equilibration and the system keeps airtight state; when in observation, a syringe directly gathers the needed voluminal gas. The invention can be used for gathering soil gas in the inundation state or in the drainage state, can gather in-situ gas with different section plane depth on the same locus, has easy operation and easily available materials, can be wildly applied to the rice field and wetland soil gas acquisition, and overcomes various kinds of defects in the prior art.

Description

1. Technical field [0001] The invention relates to an in-situ collection system and method for soil gas in paddy fields in paddy and dry rotations, belongs to the technical field of gas collection, and is specially used for in-situ collection of soil gases in paddy fields or wetland profiles under paddy and dry rotation conditions. 2. Background technology [0002] Under the background of global warming, the gas exchange between soil and atmosphere has become a research hotspot at home and abroad. However, the gas exchange between soil and atmosphere is the surface integration result of various biological activities with spatial specificity in the whole soil profile, which cannot truly and in situ reflect the formation time and location of soil gas. In situ measurement of soil gas content in soil profiles is also a key technical link to accurately calculate soil gas emission flux and study the formation mechanism of soil gas. To study dryland soil gas, soil gas can be colle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/26
Inventor 熊正琴黄太庆马煜春
Owner NANJING AGRICULTURAL UNIVERSITY
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