Effects of tea litter applications on N2O and CO2 fluxes from acidification of tea garden soil in Central China
Tea litter may impact soil microbes and soil properties, thus greenhouse gas emissions from soil. In this paper, a laboratory study was conducted to investigate N2O and CO2 fluxes from acidification of tea garden soil receiving different amounts of tea litter:0, 5, 10 g·kg-1 and 20 g·kg-1 soil. Results showed that N2O and CO2 fluxes from four treatments ranged from 0.24μg·kg-1·h-1 to 3.92μg·kg-1·h-1 and 0.33 mg·kg-1·h-1 to 1.84 mg·kg-1·h-1, respectively. Tea litter applications significantly increased N2O and CO2 fluxes(P<0.05)in a dose-effect manner. Soil pH values from three tea litter treatments were significantly higher(P<0.05)than that from the control treatment, and the pH values increased with increasing amounts of tea litters added. The N2O emissions from tea garden soil had significantly positive correlation with soil NH+4-N content, but did not show relationship with soil NO-3-N. Soil DOC content was significantly positive correlated with N2O and CO2 fluxes. There was highly significant and positive correlation between N2O and CO2 fluxes in tea garden soil. These results would advance our understanding of greenhouse gas fluxes and carbon and nitrogen cycling in tea garden soil system.
tea litteracidification of tea gardenN2O fluxCO2 fluxpH value
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