The Spatial Distribution Of Soil Organic Carbon In Small Watershed Of Hillyregion Of Loess Plateau

This paper studyed on the Xingzi River Valley of loess hilly and gully areas to discussthe various components under different terrain conditions of land use on soil organic carbonpool (Dissolved organic carbon DOC and soil Microbial biomass carbon MBC)，combinedwith field investigation and laboratory analysis， analysis of topography and land use andtheir interactions on the pattern of spatial distribution of soil organic carbon combined withstatistical models and GIS software to restore the ecology of the small watershed of loesshilly region under the conditions of soil organic carbon analysis of the distribution exploredifferent land use patterns of soil organic carbon in the small watershed ecosystems，spatialdistribution characteristics.Small watershed ecosystems under different land use patterns， soil Dissolved organiccarbon DOC， Microbial biomass carbon MBC and total organic carbon with the content anddistribution of significant differences. Forest and grassland surface soil Dissolved organiccarbon DOC content was significantly higher than the content of agricultural land and thedam to the various land use patterns，similar content of Dissolved organic carbon DOC in thesubsurface soil.Agricultural land and the dam to the surface and subsurface soil Dissolvedorganic carbon DOC content did not differ significantly. The Dissolved organic carbon DOCcontent of grassland and woodland topsoil was significantly higher than the content of thesubsurface.Forest and grassland surface and subsurface soil Dissolved organic carbon DOCcontent showed a significant correlation.Land use，surface soil microbial carbon content ishigher than the content of the subsurface. Agricultural land and the dam to the surface of thesoil Microbial biomass carbon MBC content is lower than the content of the forest andgrassland，agricultural land，forest and grassland surface and subsurface soil Microbialbiomass carbon MBC content was a significant positive correlation.Under different land use patterns，agricultural land，grassland and woodland，soil organiccarbon content increases with soil depth in the upper soil，forest and grassland soil organiccarbon content is higher than that of agricultural land and the dam to the content.Vegetationcontribute to the accumulation of the upper soil organic. On the spatial pattern of soil surface layer (0~20cm) Mao slope median plaque and lowplaque main (shaded slope> sunny slope，forest and grassland farmland)，Mao top medianplaque Mao The high organic carbon content of the top agricultural land，mainly in the ditchdam land to the value of plaque in yellow. There are differences in various land use patternsaround the shape of organic carbon content woodland organic carbon content，followed bygrassland and dam to agricultural land for at least another shady soil surface organic carboncontent was significantly higher than the sunny，Mao slope steep，the loss of the most serious organic carbon content is less，but with theincrease of the slope，surface soil organic carbon content is significantly reduced compared tothe same slope and aspect conditions，vegetation cover greater slope，organic the more carboncontent，which shows strong the Vegetation good Mao slope organic carbon storage capacity.Comprehensive analysis of the dam to soil organic carbon in the highest density ofapproximately58kg/m2，followed by the organic carbon density of the woodland andgrassland，agricultural land soil organic carbon and the lowest density. For the fixed amountof organic carbon fixed amount of soil organic carbon in the vegetation than agricultural landand the dam to the sequestered carbon is high，and the important role of vegetation with drivesoil carbon sequestration.