青藏高原东部全新世泥炭微生物群落组成及其对气候变化的响应初探

The Compositions of Microbial Community and Its Response to Holocene Climate Change in Peats from the Eastern Tibetan Plateau

为了深入研究湿地生态系统中地质历史时期微生物群落的组成及其对气候变化的响应,运用高通量测序技术对青藏高原东部红原泥炭全新世不同时期的微生物群落结构和丰度进行了研究,结果表明,微生物群落结构组成与气候的变化息息相关:早全新世气候温暖湿润,热袍菌门(Thermotogae)、绿弯菌门(Chloroflexi)和互养菌门(Synergistetes)等嗜热菌类占绝对优势;中全新世气候较早全新世寒冷干燥,嗜热厌氧菌类丰度明显降低,变形菌门(Proteobacteria)、拟杆菌门(Bacteroidetes)和放线菌门(Actinobacteria)等嗜冷好氧菌类增加显著;晚全新世气候较寒冷,但湿度有所增加,梭杆菌门(Fuso bacteria)丰度显著增加,变形菌门(Proteobacteria)含量显著减少。

The purpose of this paper is to study the change of microbial community composition and its response to climate change in the wetland ecosystem during the geological-history period. The author analyzed the microbial community structure and abundance in Hong Yuan peat from the eastern Tibet plateau during the Holocene using high-throughput sequencing technology. The results showed that changes in microbial communities is correlated close ly with monsoon climate variations： Microbial communities mainly includes Thermotogae, Chloroflexi and Synergistetes during the warm and wet early Holocene; abundance of thermophilic anaerobic microbial significantly reduced during the dry mid-Holocene. At the same time, cold aerobic microbial including Proteobacteria, Bacteroidetes and Actinobacteria significantly increased; the abundance of Fusobacteria significantly increased while Proteobacteria significantly reduced during the cold late Holocene. These results are consistent with climate variations recorded by Branched glycerol dialkyl glycerol tetraether membrane lipids（GDGTs）, humification indices and δ13 C values of Carex muliensis cellulose. Therefore, the microbial community compositions are closely related to the monsoonal climate changes during the Holocene in Hong Yuan.