A Soil Respiration Automatic Measuring Air Chamber

Abstract

The invention discloses an air chamber for automatically measuring soil respiration, which belongs to the field of ecological research. The air chamber for automatic measurement of soil respiration is composed of an automatic opening device, a base, a measuring chamber and the like. It is driven by a small DC motor placed on the base to realize timing opening and closing during measurement. The measurement chamber consists of a hollow shell, which is divided into upper and lower parts. A temperature probe can be installed in the top center of the upper part of the shell to measure the temperature in the gas chamber. The two sides of the top inside the shell are provided with ventilation ports that communicate with the infrared gas analyzer. The upper part of the shell is equipped with a copper tube with holes; the lower part of the shell is buried in the soil, and the airtightness is realized by the plastic rubber ring when the upper and lower shells are closed; the air chamber for automatic measurement of soil respiration in the present invention can be used for infrared gas analysis. The instrument provides an analytical gas source to calculate the soil respiration rate; it can quickly provide multi-point measurements.

Description

technical field [0001] The invention belongs to the field of ecological research and relates to an automatic measurement device for soil respiration rate. Background technique [0002] Soil respiration is a key process in ecosystems that is closely related to ecosystem productivity, soil fertility, and regional and global carbon cycles. As the global carbon cycle regulates climate change, soil respiration is also relevant to climate change, carbon trading, and environmental policy. Worldwide, soil respiration is second only to ocean releases of CO to the atmosphere 2 Flux, the carbon storage of the global soil carbon pool is about 1.5 times the carbon storage of vegetation. Soil respiration plays an important role in the C exchange between the biosphere and the atmosphere. Research on the storage capacity and dynamic changes of soil carbon pools will help to discuss issues such as reducing anthropogenic carbon emissions, increasing soil carbon storage, and prolonging the f...

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Problems solved by technology

These direct measurement methods also have their own advantages and disadvantages. For example, the static lye absorption method is easy to operate and is conducive to repeated repetitions. It is especially suitable for the measurement of soil respiration with large spatial heterogeneity, but the measurement accuracy is not ideal.

In the range of plant canopy height, CO was measured by micrometeorology 2 Not limited by the type of ecosystem, suitable for measuring CO in large scales 2 emissions, but this method requires relatively simple soil surface heterogeneity and topographical conditions, and its determination of soil CO 2 The accuracy of emissions is largely affected by the atmosphere, soil surface, and instrumentation

The dynamic chamber method is suitable for the determination of instantaneous and whole time CO 2 However, the air flow rate and the pressure difference between the inside and outside of the gas chamber will have a negative impact on the measurement. The equipment is relatively expensive, but it is generally believed that it can measure CO more accurately. 2 the true value of

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