Temporal And Spatial Dynamic Variation Characteristics Of Soil Surface CO₂ Concentration Based On Coordinating Kriging Algorithm

The concentration of soil CO2 reflects the biological activities above ground and underground,the subtle alteration has a great impact on atmospheric CO2 concentration and climate environment.Due to the limitation of traditional monitoring methods.it is difficult to analyze it on a large scale.In this study,The concentration of soil CO2 is calculated and deduced by the Fick's law,and 25 sampling points set in the range of 80×80 m are analyzed the spatiotemporal dynamics.The research results of this article are as follows:(1)According to Fick's first law.The the CO2 concentration in the soil surface can be calculated and deduced by carbon flux.and the result is basically the same as the data obtained by traditional monitoring methods.(2)By comparing the accuracy of the predicted values through five spatial interpolation methods.it was found that the collaborative Kriging algorithm can more accurately and objectively describe the spatial distribution of CO2 concentration in the soil surface.The CO2 concentration in the soil surface is analyzed by using spatial interpolation.which can accurately analyze the dynamic change law.(3)During the experiment.it was found that the factors affecting the CO2 concentration in the soil surface were mainly soil temperature,soil moisture and rainfall.Among them.the CO2 concentration in the soil surface is basically positively correlated with the change of the soil temperature.When the soil moisture changes due to rainfall.the CO2 concentration in the soil surface is inversely correlated with the soil moisture.(4)The spatial distribution of CO2 concentration in the soil surface was affected by rainfall,soil temperature.and soil moisture.In this paper,the spatial distribution of CO2 concentration in the soil surface is basically the same under the stable state of the experimental period.(5)In order to be convenient for calculation and analysis.this paper developed an analysis system.of CO2 concentration in the soil surface.The users can directly calculate the CO:concentration in the soil surface and can directly view its trend and spatial distribution through this system.In this study.the dynamic changes of the influencing factors and spatial distribution of CO2 concentration in the soil surface were explored,and it was found that the factors were significantly affected by soil temperature.soil moisture and rainfall.At the same time.the calculation method proposed in this paper can carry out the spatial-temporal dynamic characteristic distribution of CO2 concentration in the soil surface on a large scale.