Estimation Of Carbon Stocks In Marsh Wetlands In The Western Songnen Plain

Wetland ecosystem is the most important wetland type,and it is also an integral part of the global ecosystem.Marsh wetlands play an important role in the global natural carbon cycle and play an important role in global climate change.The study showed that 1/1000 changes of soil carbon pool will result in changes to one millionth of the atmosphere C02 content occurred so that accurate estimation of soil organic carbon will have an important role to forecast and the greenhouse effect on global climate change has.In recent years,the domestic and foreign research on organic carbon storage in terrestrial ecosystems increased gradually,but most concentrated in the estimation of organic carbon storage in large scale in the study area,while in small scale land cover for a single carbon storage type is rare,so to carry out the small scale,the specific carbon storage of land cover types is important the meaning of.In this paper,the Western Songnen Plain wetland as study area,using remote sensing and GIS technology,combined with ground meteorological data and NPP data,the determination method of field investigation and laboratory analysis,the wetland carbon distribution in different depth;based on Landsat/OLI image,using object oriented classification method,the spatial distribution of Songnen extraction plain western marsh;the difference analysis of soil organic carbon content and meteorological data using the Kriging difference method,and get the distribution factors of soil organic carbon spatial characteristics and related effects,and calculate the soil organic carbon storage in different depth in the Western Songnen plain.The research draws the following conclusions:(1)vertical distribution of soil organic carbon storage in marsh soil of Western Songnen plain.Through the study of the vertical distribution of soil organic carbon in the study area,the west of Songnen plain swamp soil moisture with rich carbon reserves,although the high organic carbon content and distribution,but the difference of the content of organic carbon distribution in large and strong regional.Soil organic carbon is mainly concentrated in the surface layer(0-30cm)in soil,the carbon reserves accounted for about half of total carbon reserves,while the middle(30—60cm)and soil layer(60-100cm)soil organic carbon storage had little difference,different layers of soil carbon density from high to low as the surface layer(0-30cm),middle(30-60cm)than in the bottom(60-100cm).The maximum soil organic carbon density appeared in the bottom soil,but the average soil organic carbon density was still the surface soil.The average soil bulk density gradually increased from surface layer to bottom layer,and the highest value appeared at the bottom,and negatively correlated with soil organic carbon content.(2)spatial distribution of soil organic carbon storage in marsh soil of Songnen Plain in the western part of the year.In the west of Songnen Plain,the distribution of organic carbon in marsh is generally high in the north,lower in the South and higher in the East and lower in the west.The area of high density of soil organic carbon in wetlands are mainly distributed in the study area near the north by Greater Khingan Range area in Zhalong Nature Reserve Area,and soil organic carbon in wetlands of low density area distribution is more dispersed,the distribution side near the Inner Mongolia area in the study area,the southwest side of the protection area to the sea level,the distribution density of soil organic carbon in different trend the soil is similar,but the surface layer(0-30cm)soil organic carbon density difference is larger,the bottom(60-100cm)soil organic carbon density is more stable,with little difference.The surface soil bulk density level of the surface layer(0-30cm)showed a trend of decreasing gradually from the center to the periphery,and the soil bulk density in the middle(30-60cm)and the bottom(60-100cm)soil tended to be similar to the soil organic carbon content.(3)correlation between soil organic carbon content and climate factors in marsh soil of Western Songnen plain.The study area of marsh wetland soil organic carbon content and temperature dependence of large,especially in the surface layer(0-30cm)soil,high organic carbon content in marsh soils and more concentrated in the low temperature region,and soil organic carbon content in high temperature area and low marsh wetland;soil organic carbon content and humidity and precipitation are positively correlated,and the correlation similar.