Studies On The Soil Carbon Components Of The Burned Land In Daxing'an Mountains Inner Mongolia

Forest soil organic carbon is one of the most important indexes to evaluate forest soil quality.Forest fire changes soil organic carbon and affects the development and succession of forest ecosystem.This paper,taking the Daxing'an mountains forest region of Inner Mongolia the burns as the research object,through the analysis of the degree of fire(not fire,mild,moderate,severe fire fire,fire),the different recovery time(16 a,10 a,5 a),the soil inr different burned wood management way,change characteristics of easy oxidation of organic carbon content,revealing the fire disturbance on soil organic carbon group the influence law of different recovery time after forest fire,the change of soil carbon component characteristics,as well as the burns management influence on soil carbon composition,for evaluation of forest soil fertility,soil carbon balance,the carbon cycle is of great significance.The results are as follows:(1)Forest fire interference has a significant effect on the content of soil organic carbon component.The trend and degree of change vary with fire intensity,time after fire,and management method of burned wood,and also affect the ROC and SOC correlation and ratio.(2)In the early stage after the occurrence of forest fires,the content of total organic carbon and easily oxidized organic carbon in soil disturbed by light and moderate fire degree will significantly increase,while SOC and ROC of soil disturbed by severe fire degree will decrease.Two years after the occurrence of forest fires,the SOC and ROC contents will increase under the interference of light,moderate and severe fire degree,among which the SOC content in soil will increase significantly under the interference of severe fire degree.(3)The SOC and ROC contents in the soil under fire in different recovery time showed the phenomenon of 5a>10a>16a,the SOC and ROC contents in the soil under fire in 10a and 5a were higher than that in the unburned sample land,while the SOC contents in the soil under fire in 16a were lower than that in the unburned sample land.(4)Different management methods of burned wood have different impacts on SOC and ROC contents in the soil,and cutting has the greatest impact on SOC and ROC contents in the soil surface(0-10cm).Soil SOC and ROC contents in clear and uncut plots will increase,while those in selective cutting plots will decrease.