Compositions of aliphatic des-A-triterpenes in the Hani peat deposit,Northeast China and its biological significance  

作　　者：ZHENG YanHong ZHOU WeiJian LIU Zhao CHEN QingMin YU XueFeng LIU XiaoMin 

机构地区：[1]State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China [2]State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China

出　　处：《Chinese Science Bulletin》2010年第21期2275-2281,共7页

基　　金：supported by the National Natural Science Foundation of China(40602004);MOST Special Fund from the State Key Laboratory of Continental Dynamics,Northwest University;the State Key Laboratory of Loess and Quaternary Geology(SKLLQG0801)

摘　　要：Aliphatic des-A-triterpenes,the degradation products of pentacyclic triterpenes have been tentatively assigned in samples taken from a 963-cm-thick peat sequence from the Hani region of Northeast China using gas chromatography-mass spectrometry(GC-MS)in order to understand and identify these des-A-triterpenes response to climate and ecology.The study indicates that aliphatic des-A-triterpenes are abundant in the Hani peat bog.The high relative abundance of the total des-A-triterpenes mainly occurs at the Holocene periods and is corresponding to the low sedimentation rate.The mechanism of des-A-triterpenes accumulation is not consistent with the previous studies.It is proposed that the biological community is also one influence factor.The obvious stage variations of the total des-A-triterpenes in the whole sequence reveal the different biological(microbes and plants) processes and responses,possibly revealing the four large replacements of biological community and functional composition in the swamp environment over the 16000 cal a BP.The low total des-A-triterpenes values occur at about 10200,8700,7700,6600,4480-3940 and 3040 cal a BP,reflecting the multiple millennial micro-environment oscillations under the macro-environment of the swamp during the Holocene.The ratios of diene and monoene des-A-triterpenes(DT/MT),des-A-lupane and diene and monoene des-A-triterpenes(DL/(DT+MT)),ratios ofindividual compounds exhibit vertical opposite to the total des-A-triterpenes. Namely,these ratios are high during the last deglaciation and late Holocene whereas they are low at other periods,indicating different compounds have different responses to micro-environment and microbial activities.This study discusses the diversity of biological community and biological functional composition response to micro-environment,which not only provides the complement in Northeast China,but also bears important fundamental information for the implication to ecological environment in the future.Aliphatic des-A-tfiterpenes, the degradation products of pentacyclic triterpenes have been tentatively assigned in samples taken from a 963-cm-thick peat sequence from the Hani region of Northeast China using gas chromatography-mass spectrometry （GC-MS） in order to understand and identify these des-A-triterpenes response to climate and ecology. The study indicates that aliphatic des-A-triterpenes are abundant in the Hani peat bog. The high relative abundance of the total des-A-triterpenes mainly occurs at the Holocene periods and is corresponding to the low sedimentation rate. The mechanism of des-A-triterpenes accumu- lation is not consistent with the previous studies. It is proposed that the biological community is also one influence factor. The obvious stage variations of the total des-A-triterpenes in the whole sequence reveal the different biological （microbes and plants） processes and responses, possibly revealing the four large replacements of biological community and functional composition in the swamp environment over the 16000 cal a BP. The low total des-A-triterpenes values occur at about 10200, 8700, 7700, 6600, 4480-3940 and 3040 cal a BP, reflecting the multiple millennial micro-environment oscillations under the macro-environment of the swamp during the Holocene. The ratios of diene and monoene des-A-triterpenes （DT/MT）, des-A-lupane and diene and monoene des-A-triterpenes （DL/（DT＋MT））, ratios of individual compounds exhibit vertical opposite to the total des-A-triterpenes. Namely, these ratios are high during the last deglaciation and late Holocene whereas they are low at other periods, indicating different compounds have different responses to micro-environment and microbial activities. This study discusses the diversity of biological community and biological functional composition response to micro-environment, which not only provides the com- plement in Northeast China, but also bears important fundamental information for the implication to ecological environment in the fu

关 键 词：三萜类化合物 中国东北地区 生物学意义 泥炭沼泽 脂肪族 生物群落结构 功能性反应 气相色谱质谱法 

分 类 号：P593[天文地球—地球化学]