Forest Soil Organic Carbon Reserve And Its Spatial Distribution Pattern In Henan Province

Forest soil is the material basis of forest ecosystem,and its soil organic carbon density and reserves is an important index to measure the health degree of forest ecosystem.The evaluation of forest soil organic carbon reserves in Henan province provides a theoretical basis for the construction of forest carbon sink in Henan province.According to"the Division Method of National Forestry Development Division Level 3 Zone",the Forestry in Henan province will be divided into twelve level 3,after choosing 810 soil sampling points in the forest zone,collecting the soil samples,and measuring the soil organic carbon content,then we can build the model of the depth of the forest soil organic carbon distribution,which will help to understand the spatial distribution pattern of organic carbon density,and assess forest any depth soil organic carbon in Henan province.The main conclusions are as follows:?1?The organic carbon density of 12 forest districts in Henan province is shown as:the surface organic carbon density is the largest,and the organic carbon density value decreases rapidly in the form of exponential function with the increase of soil depth;There were significant differences in surface soil organic carbon density?P<0.05?,significant differences in organic carbon density within different soil depths in the same forest region?P<0.05?.?2?This model is jointly determined by the topsoil and the bottom soil in the forest region,specifically expressed as:S_h=S_?+?S₀-S_??×exp?k×h?.According to the Nash-Sutcliffe efficiency coefficient,simulation error and correlation coefficient,the depth spatial distribution model of forest soil organic carbon in Henan province is constructed,and its simulation error is within the allowable range which can be used to estimate the organic carbon reserves of soil at any depth in Henan province.?3?The simulation results of forest soil organic carbon depth spatial distribution model shows that the organic carbon reserves is 358.89×10⁹ kg in the 0-100 cm layer of forest soil in Henan province,395.02×10⁹ kg in the 0-150cm layer,and 430.60×10⁹kg in the 0-200 cm layer.Compared with organic carbon reserves in the 0-100cm layer,it is increased by 10.07%and 19.99%respectively in the 100-150 cm layer and the100-200 cm layer.The soil organic carbon depth distribution model constructed in this paper can quickly estimate the forest soil organic carbon density at any depth in Henan province,and the simulation errors are within the acceptable range.The model can be used to accurately evaluate the spatial distribution of forest soil organic carbon in Henan province and provide theoretical reference for the construction of forest carbon sink in Henan province.