Seasonal variations of leaf wax n-alkane distributions and δ^(2) H values in peat-forming vascular plants from the Dajiuhu peatland, central China

作     者：Jiantao XUE Xueying ZHANG Jinzhi LI Zhiqi ZHANG Huaiying YAO Jiantao XUE;Xueying ZHANG;Jinzhi LI;Zhiqi ZHANG;Huaiying YAO

作者机构：Research Center for Environmental Ecology and EngineeringSchool of Environmental Ecology and Biological EngineeringWuhan Institute of TechnologyWuhan 430073China Administration of Dajiuhu National Wetland Park of ShennongjiaShennongjia 442417China Key Laboratory of Urban Environment and HealthInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2022年第16卷第3期

页      面：774-785页

核心收录：

学科分类：0710[理学-生物学] 1007[医学-药学(可授医学、理学学位)] 100705[医学-微生物与生化药学] 07[理学] 0708[理学-地球物理学] 071005[理学-微生物学] 10[医学] 

基　　金：supported by the National Natural Foundation of China(Grant No.41903066) the scientific research funds for universities(No.X19G028) 

主　　题：peat-forming vascular plants n-alkanes δ^(2)H ratio seasonal variations central China 

摘      要：Leaf wax n-alkane compositions have been widely applied to reconstruct paleoclimate histories in peat deposits,yet understanding of how the n-alkanes vary during seasonal plant growth remains *** we report variations in the molecular and wax-derived nalkane hydrogen isotope(δ^(2) Halk)in the three dominant vascular plant species(Sanguisorba officinalis,Carex argyi,Euphorbia esula)and surface peat deposits nearby from the Dajiuhu peatland over a growing *** three species show a relatively high carbon preference index(CPI)in the beginning of the growing season,with the CPI values reaching as high as 50 in two of the three *** species(***,***)display relatively stable average chain length(ACL)values over the four sampling intervals,with standard derivations of *** contrast,*** exhibits a significant fluctuation of ACL values(averaging 28.1
1.4)over the growing ***δ^(2) Halk in all three species decreased during leaf *** the final stage of growth,theδ^(2) Halk values of the three species are similar to those in the surface peats collected from the *** the results of our measurements of alkane concentration andδ^(2) H values,it is likely that de novo synthesis of leaf wax n-alkanes in the peatforming plant species is mainly at the early stage of leaf *** the following months,the removal process exceeds renewal,resulting in a general decrease of the concentration of the total n-alkanes and the integratedδ^(2) Halk *** theδ^(2) Halk values probably integrate the environmental variations at the end of the plant growth period rather than the whole period or the early growth *** results are significant and have the potential to improve the utility ofδ^(2) Halk values in paleoenvironmental reconstructions.