Spatial Stratification Heterogeneity Of Soil Organic Carbon And Total Nitrogen In Soil And Water Conservation Forests In Western Part Of Shanxi Province

The study of soil nutrients has always been the most important task for forest workers and agricultural researchers.Establishing a spatial database of soil attributes is conducive to the development of ecological restoration and environmental protection.This study analyzes the spatial differentiation of soil organic carbon and total nitrogen in the water conservation forests in Caijiachuan watershed,where is in the western part of Shanxi.We analyzed the soil organic carbon(SOC)and total nitrogen(TN)values of the study area through three methods including the classical statistical statistics,geostatistical software and spatial geographic information system software,then we calculate the reserve of SOC and TN.The soil organic carbon and total nitrogen content were the highest in the forest.The average soil organic carbon and total nitrogen content in the lower shallow layer of Liaodong oak are 17.8598g/kg and 1.9984g/kg,respectively.The average soil organic carbon and total nitrogen content in the deep soil were respectively 5.8743 g/kg,0.7490 g/kg.The soil organic carbon storage at 0-100 cm depth in the study area was 0.3186 Mt,and the total nitrogen storage was 0.04271 Mt.The results of geostatistical software calculations show that the semi-variance function model that best describes the soil organic carbon and total nitrogen content in the study area is Gaussian.The spatial autocorrelation analysis results of geo-statistics,soil organic carbon and total nitrogen content distribution maps indicate that surface random factors have a great influence on shallow soil attribute values,and structural factors such as spatial location have greater influence on deep soil attribute values.Geostatistical analysis calculated that the maximum autocorrelation distance distribution of organic carbon content in shallow and deep soils was 43m and 45m,and the maximum autocorrelation distances of total nitrogen in shallow and deep soils were 45m and 48m,respectively.The research results provide theoretical basis for decision-making related to soil and water conservation forest construction in Shanxi.