Greenhouse Gas Emission Potential from Different Tea Garden Soil Types

A laboratory incubation test was conducted to study the emission potential of greenhouse gases from tea garden soils and its responses to the soil nitrogen fertilizer.Four soil types (red earth, moisture sandy soil, alpine meadow soil and purple soil) were collected from tea gardens in Wuyishan City.The results showed that the greenhouse gas emission potential was significantly different between soil types (P<0.05) , the emission from alpine meadow soil was the largest.Nitrogen fertilizer increased the emission of greenhouse gases differently in cumulative amount of CO2, CH4 and N2 O for 21.27%-85.23%, 2.34%-38.58% and 21.27%-85.23%, respectively.The emission of N2 O responded more sensitively to nitrogen fertilizer than it of CO2.The application of nitrogen fertilizer significantly increased the emission of greenhouse gases from the alpine meadow soil and moisture sandy soil.The amount of CO2 dominated in the greenhouse gases of Tea garden soil, which contributed for 94% of greenhouse emission from Tea garden approximately, and it of N2 O contributed approximately from 1.44%to 5.89%, but the CH4 emission was low in Tea garden soil.The greenhouse gas emission from Tea garden was significantly correlative to the content of soil organic carbon, total N, soil NO-3-N, soil NH+ 4-N, soil bulk density and soil porosity, but not to total P, C/N and pH value.