Estimation Of The Organic Carbon Storage In Cultivated Surface Soil And Analysis Of Its Scale Effect In Henan Province

Recently many scholars have done researches on adopting different researchareas or in different ways to do a useful exploration and study to exploit that howeffectively the surface soil organic carbon in the area of study on reserves estimation,and do the corresponding scale effect analysis. However, This article selects Ruyangin Henan province as the research object to carry out the provincial and county scaleson the surface of soil organic carbon based on3S technology and the estimationmethod of soil organic carbon reserves. Three main research contents are as follows:The distribution of surface soil organic carbon density in Henan province andreserves; Henan surface soil organic carbon density of space mutation scale effect;The comparison and analysis of county method for estimating the surface soil organiccarbon.According to the outcome of the measured soil fertilizer in Henan provincescope of sample data, the province has been obtained respectively by usinginterpolation method to statistics of surface soil organic carbon content and organiccarbon density distribution, analyze the distribution of surface soil organic carbon inHenan province, and estimate the corresponding organic carbon reserves. The resultsshow that the surface layer of soil organic carbon in Henan province density isbetween0.14~11.63kg/m2, with a mean of2.48kg/m2, surface soil organic carbonreserves of0.4Pg. Combined with Henan province administrative map, soil type map,ecological agriculture zoning map, DEM and so on, analyzing the surface soil organiccarbon density and reserve of different cities in Henan province, the different soiltypes, ecological agricultural region partition.In this paper, the surface layer of soil organic carbon density is calculated as theobject, which is based on similarity measure, the spatial variation of surface soilorganic carbon density of Henan province scale effect are studied. To the measuredsoil fertilizer in Henan province agrochemical sample data (361034sample points,large amount of data) according to certain to sampling, sample amount corresponding to get20sets of data.20data sets is obtained by statistical interpolation method in thesurface layer of soil organic carbon forecast figure, calculating each grid forecastfigure and according to the total set of grid figure between covariance matrix andcorrelation coefficient matrix, the correlation coefficient of fitting with thecorresponding sampling points, to a great extent, the correlation coefficient andpaired function relation between the sampling points, so that we can approximatecalculation of the degree of accuracy required the most appropriate sampling points.At the same time, making a comparative analysis by using the same method of fiveagricultural biome.Combined with Ruyang farmland productivity evaluation data of the project,calculating the corresponding organic carbon, and contrasting the estimation accuracyof different methods based on statistical interpolation and related relationsrespectively analyzed the research of surface soil organic carbon density in the area ofdistribution. The results showed that: The effect of the multiple linear regression isthe worst, but the prediction results are similar with the other three methods.Analyzing from the root mean square error，the Kriging interpolation method is thebest. In the actual cartography，the smoothing effect of the Kriging interpolationprediction is stronger，and the Spatial regression model can relatively accrate expressthe Detailed features of Spatial variation in cultivated surface soil Organic carbondensity. Combined with soil type and terrain information, the Universal Krigingmethod can, to some extent, express the spatial variation features of cultivated surfacesoil Organic carbon density which contributes to the difference of soil type and terrain,and therefore relieve the smoothing effect.