Study On Soil Methane Fluxes Of Three Forest Types In Nanling Mountains

Facing the increasingly serious environmental problems,under the pressure that the human needs a good living environment.The environmental issue of greenhouse effect leads to greenhouse gases typical,it has been our concern.As an important atmospheric methane sink of forest soil and related ecological processes of methane flux has undoubtedly and it is a hot topic of global change ecology,to provide basic data for research on soil methane fluxes in subtropical forest ecosystems,based on the typical evergreen forest ecosystem in Nanling broad-leaved?EG?,coniferous forest?EK?,mountain coppice?GS?of three main forest types as the research object,use the the special geographical position is divided into North and South slope of the study of forest soil methane,from August 2014-2015 year in December in the course of the observation period,to study the temporal and spatial variation of soil CH4 flux,while using static chamber gas chromatography the influence factors?temperature,humidity and so on?on soil methane flux were analyzed by spectral method:Nanling evergreen broad-leaved forest,coniferous forest and mountain forest of the three main forest types emerge methane sink,soil CH4 fluxes of annual average order of evergreen broad-leaved forest,coniferous forest,mountain coppice,average values were-4.326ug/m^-2h^-1,-6.025ug/m^-2h^-1 and-15.406ug/m^-2h^-1.In the study sites for the north and south slope were compared,The results show that the southern and Northern Nanling Mangshan,there are significant temporal and spatial differences in soil CH4 fluxes change.In seasonal variation,South and North Slope of different forest soil CH4 fluxes for the overall performance of winter and spring to summer emissions,to absorb the law of seasonal variation of forest soil in 12-3 month methane emissions to the atmosphere,performance as a source of atmospheric methane.4-10 months of forest soil absorption performance for methane sink of atmospheric methane,significant seasonal differences in soil CH4 fluxes.The spatial pattern change,the southern and northern slopes are manifested as sink of atmospheric methane,and on the whole forest soil on the North Slope of methane absorption capacity is greater than the Nanling forest soil methane absorption ability analysis,impact factor of soil CH4 fluxes showed that three major forest types of soil soil methane flux and soil surface temperature.The effect of?P<0.05?,but the soil surface temperature does not influence the main control factors of soil CH4 fluxes.The soil moisture effect on the three main types of forest soil CH4 fluxes were significantly?P<0.05?,evergreen broad-leaved forest and coniferous forest soil methane and negative correlation with soil moisture,mountain coppice soils methane is positively correlated with soil moisture.Analysis on soil organic matter,total carbon content of broad-leaved forest soil in South and North Slope at 1300m above sea level,evergreen,there are significant differences of total phosphorus and soil total nitrogen content?P<0.05?.The soil texture factors,there are significant differences in different forest types of soil CH4 fluxes and soil bulk density?P<0.05?.