The Research On The Soil Active Organic Carbon Of Degraded Upland Meadow In Wugong Mountain

For the study of degradation mechanism of evolution in Wugong Mountain Meadow,this paper takes Wugong Mountain seriously interference areas Jinding and JiulongMountain area as the research object to study the soil active organic carbon on differentregions of different degree of disturbance, altitude and vegetation. Through the research ofthe soil active organic carbon’s distribution characteristics and spatial heterogeneity, theconclusions are as follows:(1) The results of carbon loss rate of Jingding area are as follows: Microbial biomasscarbon is the most loss carbon and its light disturbance carbon loss rate is30.50%, thesevere disturbance of carbon loss rate is72.06%, sub surface’s carbon loss rate56.50%,78.66%respectively. The surface soil soluble carbon loss rate of light disturbance is20.10%, severe interference is47.74%, sub surface are39.91%,59.54%, respectively; theeasily oxidized carbon loss rate of mild disturbance of the surface soil is24.66%, severeinterference is45.12%; subsurface respectively31.26%,46.28%. Thus the area moreinterference, the loss of the carbon loss rate is higher.(2) The carbon loss rate of Jiulong area is as follows: the soluble carbon is the mostloss carbon, and its carbon loss rate of the light disturbance is23.67%, severe interferenceis87.05%; subsurface soil are16.84%,96.13%. Microbial biomass carbon’s loss rate of theslight interference is21.77%, severe disturbance is53.11%, the rate of light interference ofsubsurface soil is26.88%, the severe interference is59.20%. The easily oxidized carbonloss rate of the surface light interference soil is26.28%, severe disturbance of carbon lossrate is50.82%. Subsurface soil carbon loss rate is respectively29.51%,54.30%. Thus themore interference of grazing, the more loss of the soil carbon.(3) Whether in the Jin Ding area or Jiulong mountain area, the correlation betweensoil organic carbon and microbial biomass organic carbon and easily oxidized carbon havereached extremely significant level, and between soluble carbon content also have reachedsignificant correlation. In the Jin Ding area, The soil microbial biomass organic carbonbetween dissolved organic carbon and easily oxidized carbon have significant correlation,but dissolved organic carbon have less correlation between easily oxidized carbon. InJiulong area, dissolved organic carbon between microbial biomass organic carbon andeasily oxidized carbon have extremely significant correlation. So between organic carbonand active carbon has certain correlation, changes in organic carbon will directly affect theactivity of carbon content. And then it will change the relationship between the soil carbonsink and the source. Thus it will have a certain impact on atmospheric carbon dioxideconcentration. (4) The organic carbon of different vegetation communities between microbialbiomass carbon and readily oxidizable carbon are in extremely significant correlation; butjust has significant correlation with soluble carbon. Soluble carbon and easily oxidizablecarbon are extremely significantly related, but have no correlation with microbial biomasscarbon. Microbial biomass carbon has no correlation with easily oxidizable carbon.Microbial biomass carbon and readily oxidizable carbon has no correlation. As there aremany factors of soil in different vegetation communities, including different areas,different vegetation communities at different altitudes. Therefore, the same active carboncontent between different vegetation communities will have very big difference.