Method for carrying out in-situ measurement on respiration, nitrification and denitrification processes of soil

Abstract

The invention relates to a method for carrying out in-situ measurement on respiration, nitrification and denitrification processes of soil, and belongs to the technical field of soil science. The method comprises the following steps: constructing a closed cavity in an in-situ soil taking position; calculating the volume V of a gas in the closed cavity according to a gas state equation of a closed system; measuring and calculating the variables of carbon dioxide and oxygen in the closed system, thus obtaining speeds, namely, a denitrification speed Kden, a respiration speed Kres and a nitrification speed Kni, of related chemical processes of the soil within unit time and unit mass. According to the method disclosed by the invention, the speeds of the respiration, nitrification and denitrification processes of the soil can be dynamically and simultaneously measured in real time and in situ, and in-situ test can be carried out by directly taking the soil from an outdoor testing point, so that the measuring accuracy of the related chemical processes can be greatly increased.

Description

technical field [0001] The invention relates to a method for measuring the rate of the soil respiration process, in particular to an in-situ measurement method for the production rate of various gases in the process of soil respiration, nitrification and denitrification, and belongs to the field of soil science and technology. Background technique [0002] As a basic component of terrestrial ecosystems, soil participates in biogeochemical cycles and carbon and nitrogen cycles of terrestrial ecosystems through carbon and nitrogen cycles. The soil carbon cycle is mainly realized through soil respiration. The soil nitrogen cycle is mainly realized through nitrification and denitrification reactions. Soil respiration generally refers to the release of CO from the soil 2 or absorb O 2 Strength of. Soil nitrification and denitrification mainly refers to the intensity of nitrogen oxide or nitrogen gas released from the soil. The emission of carbon dioxide gas and nitrogen oxid...

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Problems solved by technology

[0004] The shortcomings of the current commonly used methods are: the static box method needs to extract part of the system and measure it through the gas phase, so the workload is large, and it cannot be measured in real time

However, the isotope calibration method needs to add relevant isotopes to the soil, and the method of isotope determination requires high economic investment, the determination process is more complicated, and the cost is higher

Obviously, this method has certain limitations for large-scale experimental research.

And the isotopic signal will gradually disappear with time

Therefore, it is not possible to measure the long-term scale

At the same time, radioactive isotopes have environmental health problems, so many experiments can only be limited to short-term experiments in the laboratory

[0006] In addition, the soil gas emission in-situ measurement device (ZL201520461732.0) discloses a device for in-situ measurement of soil gas emission, but does not give specific measurement and calculation methods

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