摘要：Background and Objective: The CO2 contributes more than 60% to global warming because of its huge emission amount. The CO2 could be absorbed into urine or aqueous solutions and could be used as fertilizer. The bicarbonate from these new fertilizers can be deposited as carbonated minerals in the subsoil layers of alkaline soils. The aim of this study was to use agricultural land as a sink for CO2 after being absorbed in urine. Materials and Methods: The application of raw or carbonated urine and urine bubbled with diesel exhaust from a tractor has been studied in relation to the adsorption of C and N in two agricultural soils (loam and silty-clay-loam). Differences between soil-solution treatments were determined using ANOVA with a Bonferroni multiple-comparison test. Soil- chemical properties were examined with linear regression. Results: The effect of carbonated urine and urine was similar. The adsorption of salts, ammonium-N and dissolved organic carbon (DOC) to soils increased with the initial urine solution concentration and can be described by a linear approach. The total-N (TN) and organic carbon (OC) contents in soils can be described by a non-linear (square-root initial concentration) model. A parabolic approach showed a good fit to the inorganic carbon (IC) data with a maximum content for soils treated with dilution higher than 1:1 urine-water. Conclusion: The comparison of the results of the adsorption experiments with TN and total-carbon (TC) content in soils indicated that the fertilization with urine or carbonated urine after CO2 absorption, could serve as a method for sequestration of C and N from greenhouse gases in the soils.
