Research Of Grasshouse Gases Of The Tea Garden

More and more attention is paid to the greenhouse gas emissions of tea garden ecosystem and their impact on the environment. To understand the influence of greenhouse gas emissions on the environment and provide scientific basis of reasonable management of tea garden ecosystem, this paper have studied Carbon dioxide, Methane and Nitrous oxide fluxes and their influence factors by closed chamber-Gas Chromatography method under three different land use types of tea garden(Straw-covered tea garden, Potato-fertilizer tea garden, Qing Geng tea garden) at FeiYue tea plantation base in XiangFeng Tea limited company at Jinjing count, Changsha, Hunan province. The mainly results were as follows:1. Gas emissions trend of three types of tea garden of N2O and CO2 within 24 hours was same, with smoothly trend from7:00～9:00am, soil N2O flux ranged from 133.31～131.60G/ha/d, Soil CO2flux ranged from 248.38～289.51G/ha/d, then trended increasingly, with the highest N2O flux inl3:00pm,274.51G/ha/d,andCO2 flux after 15:00,471.41 kg/ha/d,and with the lowest inl:00 evening,57.78 G/ha/d,-89.18Kg/ha/d. There was absorbing and emitting CH4, with delicated fluctuation, even near zero.2.With the mean flux from191.02 to 201.18Kg/ha/d,soil CO2 flux under three land use types ranged from13.8 to 768.35 Kg/ha/d, which showed the months' fluctuation of tea garden soil CO2 flux during three important growing seasons, with the highest in summer's months, the higher in spring's months, and lower in autumn's months, with the highest in July, and the lowest in March, with Straw-covered tea garden higher two others. The order of average soil CO2 flux was:Straw-covered tea garden>Potato-fertilizer tea garden> QingGeng tea garden, with seven months flux from14899.8 to 16160.1kg/ha/d. Soil CO2 flux was highly correlated with temperature in 5cm soil depth and there were no significant correlations between soil CO2 fluxes and soil moisture.3. The order of month of soil CH4 flux showed Straw-covered tea garden and QingGeng tea garden absorbed CH4, Potato-fertilizer tea garden emitted CH4 in March, June and September, and absorbed CH4.Straw-covered tea garden and QingGeng tea garden had significant 5% correlations, With the mean flux from-85.17 to 113.28 g/ha/d, soil CH4 flux under three land use types ranged from-2809.30 to 4757.05g/ha/d, The order of average soil CH4 flux was:Potato-fertilizer tea garden> Straw-covered tea garden> QingGeng tea garden. Soil CH4 flux was linear correlations with temperature in 5cm soil depth and there was no significant correlations between soil CH4 fluxes and soil moisture.4. With the mean flux from36.27 to 114.08g/ha/d,soil N2O flux under three land use types ranged from1.70 to 892.37g/ha/d,which showed the months'fluctuation of tea garden soil N2O flux during three important growing seasons, with the highest during the spring and summer's tea growing season, the higher during the summer and autumn'tea growing season, the order of average soil N2O flux was: Potato-fertilizer tea garden> Straw-covered tea garden> QingGeng tea garden, and seven months highest flux was Potato-fertilizer tea garden.the lowest was QingGeng tea garden. Soil N2O flux was no correlated with temperature in 5cm soil depth and there were no significant correlations between soil N2O fluxes and soil moisture.