长白山圆池泥炭沼泽演变及环境信息记录

通过分析长白山圆池泥炭剖面总有机碳含量、总正构烷烃含量、奇偶优势指数、(C23+C25)含量和2C31/(C27+C29)比值,讨论了泥炭发育不同时期植物输入情况,同时结合210Pb测年建立的年代序列来探讨该区的气候变化规律.研究结果显示,约1400年前,气候干冷,圆池尚没有出现沼泽化;1400年开始,气候稍暖,少量植物输入,圆池开始沼泽化;约从1860年至今,气候逐步转暖,大量植物输入,圆池沼泽化速度加快.

The Evolution and Environment Archives of Yuanchi Peat Mires in Changbai Mountains

Peatl mire is formed by decayed wetland plants,which were accumulated for a long time.It is a good geological archive to get information about surrounding environment,thus,it could preserve the high resolution informations that from deposition layers.Plant species and growth are controlled by climate change,so,organic compounds in peat could reflect vegetation succession of plants’residue and then reveal the characteristics of climate and development of peat mires.Peat mires are important ecosystem and distributed widely in the Changbai Mountains,but they have received less attention than other ecosystems because away from industrial area.So it was less affected by human activities.Above those reasons,peat mires in Changbai Mountains are ideal area to gain information about environmental change.The study discussed the vegetation succession of peatlands in different development periods by analyzing total organic carbon content,normal alkanes content,odd-even predominance index,content of(C 23 +C 25),value of 2C 31 /(C 27 +C 29) in peat profiles,of Yuanchi peatland in Changbai Mountains.Meanwhile,the history of climate change in this area was discussed by combining with 210 Pb dating.It turned out that,in about 1400,the lake in Yuanchi was not in a palustrine process,due to the cold and dried climate;then the temperature was slightly warm,it began a palustrine process with less vegetation inputting;so far,in 1860,climate became warmer gradually,therefore,a mass of plants was input,which gave rise to the acceleration of a palustrine process for the lake in Yuanchi.The change of every index of organic compounds in peat profiles reflected comprehensively that the evolution characteristics of the peatland and provided a scientific basis for regional environment changes,prediction of peat mires evolution and ecological restoration of degraded wetlands.