晚全新世以来大兴安岭北部多年冻土区泥炭地碳累积与气候变化关系研究

Peatlands in permafrost regions represent a globally-important store of organic carbon, which play an important role in global carbon cycle and climate change. The northern part of the Greater Khingan Mountains is an important peatlands distribution area in China, and also the only zonal permafrost distribution regions in China, where the peatlands coexisted with permafrost and extremely sensitive to climate change. However, as the sensitive area of climatic change, the stability of the carbon storage capacity of the peatlands in the region is not yet clear under the future climate change. In this project, peatlands in the north of the Great Khingan Mountains which located at the continuous permafrost regions were selected as study region to analyze the carbon dynamics. Based on the AMS C-14, Pb-210 dating methods, a high-precision chronological framework will be established. Meanwhile, on the basis of modern process research, we will use the testate amoebae, humification and loss organic ignition to reconstruct the peatland paleohydrology and carbon dynamic history during the late Holocene in this region. And then we will discuss the influence of the regional climate change, peatland vegetation composition and hydrology change on the carbon accumulation rates. Through extensive comparative analysis of carbon accumulation rates and climate records, the relationship between the peatland carbon accumulation and climate change were revealed in the continuous permafrost regions, thus providing key data support for assessing the potential impact of climate change on carbon storage of peatlands in permafrost regions in the future.

北半球多年冻土区泥炭地是全球重要的碳储存库，在全球碳循环和气候变化中发挥着举足轻重的作用。大兴安岭北部是我国泥炭沼泽重要分布区，同时也是我国唯一的地带性多年冻土分布区，泥炭地与冻土相伴而生，对气候变化极为敏感。作为气候变化敏感区，在未来气候变化背景下，该区泥炭地碳储存能力的稳定性尚不明确。基于此，本项目拟选择我国大兴安岭北部多年冻土区泥炭地为研究对象，以剖析该区泥炭地碳累积变化为主线，运用AMS C-14、Pb-210等年代学手段，建立高精度年代学标尺；在现代过程研究的基础上，利用有壳变形虫、腐殖化度和烧失量等分析，定量重建该区泥炭地晚全新世以来古水位和碳累积变化历史；进而探讨区域气候变化、水位变动对泥炭地碳累积的影响。通过碳累积速率和气候记录的广泛对比分析，揭示多年冻土区泥炭地碳累积与气候变化之间的关系，进而为评估未来气候变化对多年冻土区泥炭地碳储量的潜在影响提供关键数据支撑。

北半球多年冻土区泥炭地是全球重要的碳储存库，在全球碳循环和气候变化中发挥着举足轻重的作用。本项目以我国大兴安岭北部多年冻土区中的泥炭地为研究材料，运用AMS14C等年代学手段；在现代过程研究的基础上，利用有壳变形虫、腐殖化度和烧失量等分析，定量重建该区泥炭地晚全新世以来古水位和碳累积变化历史；进而探讨区域气候变化、水位变动对泥炭地碳累积的影响。.（1）通过收集和自测的335个基底年代数据，阐明了东北地区沼泽湿地形成发育的规律，并明确了该区域大规模发育时期集中在全新世晚期；（2）基于泥炭中有壳变形虫的鉴定分析，重建了大兴安岭北部多年冻土区泥炭地近百年来的水位变化历史，并探讨了其影响因素；（3）通过采集泥炭沉积序列，我们共获得了5个AMS14C年代数据，200余个泥炭沉积样品的干容重、烧矢量数据，重建了大兴安岭多年冻土区泥炭地晚全新世以来碳累积变化历史，并分析了其影响因素。.本项目揭示了多年冻土泥炭地发育、碳累积及其气候变化之间的关系，研究结果可为未来评估气候变化对多年冻土区泥炭地的潜在影响提供数据支撑。迄今为止已发表中英文论文8篇（其中第一标注4篇，第二标1篇，第四标1篇），目前仍有2篇论文正在审稿中。