Study Of Response Of Greenhouse Gas Flux Of Frozen Soil To Forest Gres Interference In Area Of Great Hinggan Mountains Of Inner Mongolia

This study is about soil greenhouse gas fluxes in the growing season after forest fires in Frigid-temperate Zone, which was used the way of static box-gas chromatography of situ observation and research, and reveals the variation law of soil CO2, CH4, N2O flux of different years and different degrees of fire disturbance with time and their mutual relations with the heat and water factors as well as the greenhouse potential value of global warming in this region.(1) The CO2flux of2003fire area,2008fire area, the2003light degrees, severe degrees fire area and2008light degree, severe degree fire area over time were significant seasonal variation, which are basically the same as contrast area. Compared with the contrast area; The CO2emission fluxes of2003fire area and2008fire area increased respectively by36.65%and29.7%.Under the circumstances of interference of different degree fire area, in addition to the2003severe fire places, in other kind of CO2flux and T10(earth temperature of10cm depth) as significant with or very significant index relationship; And T5(earth temperature of5cm depth) are as significant with or very significant index relationship; And soil moisture content rate (W10:soil moisture of10cm depth) correlation is not significant. The Q10values of contrast area、2003Light degrees, severe degrees fire area and2008light degree, severe degree fire area were respectively1.03,1.02,1.01,1.03,1.03.(2) The CH4flux of contrast area, the2003fire area and2008fire area were wavery over time and strong multi-peak curve.The CH4flux change law of2003Light degrees, severe degrees fire area and2008light degree, severe degree fire area is not obvious, the emission and absorption staggered emerged. Compared with the contrast area, the methane absorption flux of2003fire area and2008fire area was weakened by54%and58%respectively. The CH4absorption fluxes of2003light degrees, severe degrees fire area and2008light degree, severe degree fire area with the T10, W10was no significant correlation.(3) The seasonal variation of N2O fluxes of contrast area was gentle, the seasonal variation of N2O fluxes of2003fire area and2008fire area were multi-peak changes, whose law were quite different; The seasonal variation of N2O fluxes of2003light degrees, severe degrees fire area and2008light degree, severe degree fire area were multi-modalcurve.The contrast area released N2O, the2003fire area and2008fire area were respectively expressed as the N2O emissions and N2O absorbed. The2003light degrees, severe degrees fire area respectively expressed as the absorption of N2O and emissions. The2008light degrees, severe degrees fire area respectively expressed as the emissions and absorption of N2O. Overall, the N2O fluxes of different degrees fire area with the T10and W10were no significant correlation.(4) The potential value of global warming of2003light degrees, severe degrees fire area and2008light degree, severe degree fire area increased respectively by29.5%,39.4%,42.1%,18.4%.