Hebei Plain Soil Organic Carbon Storage Change Control Factors And Trend Analysis

As the biggest terrestrial ecosystem of carbon storage soil organic carbon storage hascritical influence on global warming, which has received extensive attention of domesticand foreign scholars in recent years. The article utilizes20029surface soil samples、5056deep soil samples of multi-objective geochemical survey in HeBei province and nine soilprofiles of the research area. On GIS platform adopts the concept “unit soil carbon content”to which geological survey puts forward. According to the classification of the two kinds ofpartition way of soil type and land use calculate soil organic carbon density and organiccarbon storage in HeBei Plain; Through the nine soil profiles, and analyzes the rule oforganic carbon vertical distribution; Using correlation analysis, and discusses the influencecontrol factors and trends of the change of organic carbon reserves in HeBei Plain. Themain conclusions:1、At present,soil organic carbon calculation is divided into two methods:thestraight-line method and index method. Proved by the research and formula, precisiondegree is: index method> stepwise method> average method;2、0²0cm,0¹00cm and0¹80cm,the three layers of the soil organic carbon densitiesare2249.6t·km^-2,73891t·km^-2and10562.5t·km^-2. Lower than the average level of thecountry.0²0cm,0¹00cm、0¹80cm, soil organic carbon storage are166.7Mt、547.6Mt、782.8Mt, surface and deep soil organic carbon are increased by38.4Mt than in1979,138.68Mt now，and total occupied29.93%and21.53%of1979. In the25years it hasabsorbed a lot of carbon dioxide and made great economic contribution to HeBei province;3、Different soil types have different organic carbon densities. Among them swampsoil, turmeric soil and black sand ginger are higher,respectively:160.7t·km^-2,2794.3t·km^-2and2631.5t·km^-2; the lowest sand soil is1656.3t·km^-2,compared to1979,swamp soil andbrown soil organic carbon content is reduced. The brown soil is mainly for cultivated landreclamation or field,the area is reduced,human activities intensify the decomposition rate ofthe organic carbon.Objectively react that human activities aggravate and damage naturalenvironment,leading to the loss of organic carbon. Organic carbon stores mainly in wet soiland brown soil in HeBei Plain,which accounts for91.15%of the whole province;4、Analyze the use types of the lands in southern and eastern plain.Different utilizationof land types, the density of soil organic carbon is different. Overall shows that：The higherparts are agricultural lands,lands for residential areas and mining lands,and cultivated lands independent,forest land is respectively lower. Through calculation, indicates that thereserves of organic carbon in the southern plain is653.58Mt, eastern plain is125.56Mt;5、Analyze the reasearch area of nine soil organic carbon profiles, obtaining that soilorganic carbon decreased with soil depth. Different soil organic carbon content hasdifferent configuration, cohesive soil is greater than all kinds of soil types;6、Through the correlation analysis, soil organic carbon content and alkali solutionnitrogen,total nitrogen,total phosphorus quantity is of significant positive correlation, andinversely related of PH value. Soil parent material, soil types, soil properties, land use andmanagement, fertilization, atmospheric CO2concentration all affect soil organic carbonstorage and changes;7、By controlling the influence factor analysis,the trends of HeBei plain soil organiccarbon is growing. Analyze the future reserves of organic carbon storage change of the year2022,2032. Forecast organic carbon reserves in2022for882.77Mt,2032organic carbonreserves for938.27Mt.