Indirect measurement method of greenhouse gas emission rate from subtropical forest soil

Abstract

The invention discloses an indirect measurement method for emission rate of greenhouse gases in forest soil of a subtropical zone. The indirect measurement method is carried out by adopting the following steps: firstly, determining factors, namely, determining four key factors influencing emission of the greenhouse gases in forest soil, respectively a soil water content, a soil temperature, a soil water soluble organic carbon content and a soil microbial biomass carbon content; secondly, measuring an emission rate, the soil water content, the soil temperature, the soil water soluble organic carbon content and the soil microbial biomass carbon content of the greenhouse gases (CO2, N2O and CH4) of the soil in field; thirdly, establishing a relational expression; fourthly, determining relevant parameters according to the relational expression; and fifthly, calculating the emission rates of the greenhouse gases (CO2, N2O and CH4) of the soil according to the relational expression and actually measured data. Compared with other relative determination methods established by single influence factors, the indirect measurement method has the advantage of improving the reliability; compared with a static box method, the indirect measurement method has the advantages of being smaller in numerical value deviation range, reducing field workload, reducing measurement cost, and remarkably increasing measurement efficiency.

Description

【Technical field】

[0001] The invention relates to a method for measuring the greenhouse gas emission rate of forest soil, especially a method for indirectly measuring soil by establishing a multivariate linear relationship by measuring soil temperature, soil moisture content, soil water-soluble organic carbon content, and soil microbial biomass carbon content. Greenhouse gas emission rate methodology. 【Background technique】

[0002] An increase in the concentration of atmospheric carbon dioxide will directly lead to an increase in the absorption of long-wave radiation from the sun by the atmosphere, causing a rise in global temperature and causing severe climate fluctuations. The rapid melting of the polar permafrost ice has greatly reduced the land area, threatening the living safety of humans and land creatures. Therefore, reducing carbon dioxide emissions has become a global research hotspot.

[0003] The aboveground part of the forest vegetation carbon pool stores 80% ...

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