Device and method for determining soil respiration and carbon isotopes

Abstract

The invention provides a device for determining soil respiration and carbon isotopes. The device comprises an air suction pipeline, a carbon dioxide filter, a soil air chamber and a carbon isotope analyzer. An air inlet hole of the carbon dioxide filter is connected with the air suction pipeline. An air outlet hole of the carbon dioxide filter is connected with the soil air chamber. The soil air chamber is connected with the carbon isotope analyzer through an air path pipeline. The invention further provides a method applying the device for determining soil respiration and carbon isotopes. The device is arranged on a sample plot for directly obtaining soil respiration data, sampling is not needed back to a laboratory, no damage is caused to plants, and the device is rapid and convenient to use; the adopted device can achieve measurement in the day, at night and when it rains, and complete tree respiration information within one season and one year can be obtained.

Description

technical field [0001] The invention belongs to the field of analysis and testing, and in particular relates to a device and method for measuring soil respiration by using isotope analysis. Background technique [0002] Soil respiration, as an important part of the carbon cycle of the ecosystem, is the main way to convert organic carbon in the soil into inorganic carbon and return it to the atmosphere. It is a key link in the terrestrial ecosystem and is very important in the global carbon cycle. . Global research on soil respiration started in the 20th century. At the beginning of the 20th century, research on soil respiration was mainly carried out in laboratories, with the goal of evaluating soil fertility and soil microbial activity. Since the middle of the 20th century, the research on soil respiration has become active. During this period, due to the continuous optimization of research methods, the accuracy and scale of research have also been greatly improved. Until...

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Problems solved by technology

In addition, this method does not measure the respiration value and its isotope ratio in the same soil and under the same conditions at the same time, which will inevitably lead to errors

[0006] None of the above methods can guarantee the soil respiration value and its δ 13 The measurement accuracy of the C value cannot be considered in the measurement, and it is difficult to carry out collaborative observation

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