Distribution characteristics of permafrost soil carbon at different depths in the Da Hinggan Ling Prefecture
High latitude permafrost regions are the most sensitive areas to climate change.The degradation of permafrost seriously affects the soil carbon cycling process.Revealing the vertical distribution pattern of soil organic carbon in permafrost layers under different land cover types is of great significance for predicting fu-ture changes in soil carbon pools in permafrost regions.Here we select forests,forest swamps,and shrub swamps in the high latitude permafrost areas of the Da Hinggan Mountains.Soil columns(7-8 m)were collec-ted using drilling methods to measure soil carbon(organic carbon,soluble organic carbon)under the three dif-ferent land types,and further analyzed the carbon content at different depths.The results showed that as the depth increased,the soil carbon contents decreased,and the organic carbon content varied froml4.55 g/kg to 95.98 g/kg(forest swamp),from 17.48 g/kg to 132.93 g/kg(forest),and from 2.58 g/kg to 396.50 g/kg(shrub swamp).There was also a high carbon content soil layer in permafrost layers.The average content of organic carbon and soluble organic carbon in the active layer soil is as follows:shrub swamp＞forest＞forest swamp,and the average content of organic carbon and soluble organic carbon in the permafrost layer soil is as follows:forest swamp＞forest＞shrub swamp.The correlation analysis revealed significant negative correlations between depth and soil organic carbon content,water-soluble organic carbon content,and soil water content in soils un-der forest and shrub swamp conditions.However,there was no significant correlation between depth and these indices in soils under forest swamp conditions.Additionally,pH values were significantly positively correlated with depth across all soils,while they were negatively correlated with soil organic carbon content,soluble or-ganic carbon content,and soil water content.The coefficient of variation of organic carbon in the active layer is 30.31％-114.26％,and the coefficient of variation of organic carbon in the permafrost layer is 30.23％-192.09％.Correlation analysis showed that soil organic carbon was negatively correlated with depth and pH,and significantly positively correlated with soil moisture.
Da Hingan Ling Prefectureactive layerpermafrostsoil carbonsoil moisture
NETL
NSTL
万方数据
