Device and method for dynamically and continuously measuring soil respiration rate and isotope composition by adopting large sample

Abstract

The invention discloses a device and a method for dynamically and continuously measuring soil respiration rate and isotope composition by adopting a large sample. According to the invention, an air pump is used for driving air to pass through a soda lime column and an air filter so as to produce clean CO2-free air, and the clean CO2-free air is used for steadily carrying CO2 produced by soil respiration to dynamically enter a detection device, so as to achieve dynamic and continuous measuring, and therefore, the detection efficiency is improved; and meanwhile, a plurality of vertically-arranged cylindrical culture tubes with openings at two ends are designed as soil culture tubes, and when in detection, culture soil is filled to reach 1/2 to 3/4 of the volume of the soil culture tube, so that the soil weight of each soil culture tube is 100-500g, and the clean CO2-free air enters from the lower end of the soil culture tube and flows out from the upper end of the soil culture tube, thus realizing detection on large samples, and improving the accuracy and the representativeness of detection data.

Description

technical field [0001] The invention relates to the technical field of soil monitoring, in particular to a device and method for measuring soil respiration rate and isotopic composition with a dynamic continuous large sample. Background technique [0002] In recent years, disturbances in the carbon cycle caused by human activities have led to CO in the atmosphere 2 The content is increasing day by day, and the issue of global warming has received widespread attention. Soil is the largest carbon pool in terrestrial ecological devices, and the increase in carbon storage in soil will help to moderate the atmospheric CO caused by human activities 2 content increased, while soil CO 2 release will exacerbate CO 2 trend of increasing content. In the context of climate change, the temperature sensitivity of soil respiration, especially the temperature sensitivity of stable carbon pools in soil and the temperature sensitivity of soil respiration under the condition of long-term t...

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Problems solved by technology

[0005] 1. The amount of experimental soil samples is often small (<50g), and it is impossible to realize large sample detection, which leads to problems such as large measurement errors and poor representativeness

[0006] 2. It is generally a static absorption process, and it is difficult to fix all the CO produced by soil respiration 2 , there are shortcomings such as that the sample cannot be continuously and quickly measured, which affects the progress of the experiment

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