Distribution and Implications of the Elements of Peat Profiles in the Jinbei Bog of the Changbai Mountains

The study focused on the distribution of the elements of peat in the Jinbei bog of the Changbai Mountain.Samples were collected with Wardenaar peat sampler madein Netherlands.The peat bog is located in the Jinbei of Fusong countywith altitude of over 900 min Jilin province,Northeast China.The peat depth is about 1.1 m,and the area 4.925 km~(2).The peat developed between 366-1 944 a.The winter here is long and cold while summer short and humid.The annual precipitation varies between 650 mm and 900 mm and the mean temperature is 2 ℃to 5 ℃.The peat bog developed here was typically ombrotrphic,which indicated the inorganic content was mainly from rainwater.Sphagum is widely developed and the mineral where the peat began to develop is basalt mesa.Each peat profile was sectioned into 2 cm at thefield.The contentsof Ca,Mg,Na,Kand Al,Ti,Cu,Zn,Fe,Mn,Pb,Ni,Cr,Co were determined by GBC-906AASand ICP-AES respectively.The article aimed at revealing the depositional environment of the Jinbei peat bog,the changes of heavy metal elements with history and its implications for environment.The order average content in peat profile was AlFeNaKCaMgMnZnCrPbCuCoNi.Furthermore compared with the average content of trace elements with peat bogs in the Daxinganling Mountains,the elements' contents were all more than those of peat bogs in the Daxinganling Mountains except Mn and Ni.The correlation analysis between the analyzed elements indicated the differencesbetween them.Conservative elements such as Al and Ti were significantly correlated.Most of the heavy metals in peat were significantly correlated except Cu,for Cu can be easily transferred with water in acid condition.Through the enrichment analysis of the elements,the results showed that Mn,Zn,Pb,Cu,Ni,Cr and Co were significantly enriched in the top section of the peat profile.And Na and K distribution were strongly affected by their transference with water in peat.The EF value of major elements(Al、Fe、Na、K、Mg and Ca) were all less than 1,indicating relative less depositional sources of atmospheric soil dust.It was found that the distribution of major elements with depth was greatly intimate with the sediment chemistry when the peat began to develop,and Na、K were affected by bioaccumulation of plants.The increasing content of Mn,Zn,Pb Ni,Cr and Cofrom bottom to top in peat profile prove the increasing pollution of them in environment during these yearsand the increase of the metal consumption and exhaustion were the main sources,which has profound implications for environment.