中国末次冰盛期以来泥炭发育与气候变化

泥炭是陆地生态系统碳库的重要组成部分，其发育演化对全球碳循环具有重要的影响。然而，目前轨道时间尺度上中低纬泥炭发育与季风演化关系及其对全球CH₄浓度变化的影响，还存在很大的争议。本研究基于末次冰盛期以来我国泥炭发育的起始¹⁴C年龄数据，通过年龄概率密度方法，系统重建了东亚季风区泥炭发育的时空演变历史。
结果表明：末次冰盛期我国南方泥炭开始发育，冰消期以来泥炭发育逐步扩展至华北、东北、西北和青藏高原地区，并发育增强；全新世时段，不同区域泥炭发育存在明显的空间差异，东北和西北泥炭发育呈现持续增加，而南方、华北和青藏高原地区在早-中全新世增加，之后呈现下降趋势。结合全国孢粉记录的古气候定量化重建结果，发现我国末次冰盛期以来不同区域泥炭发育主要受降水变化的影响，揭示出泥炭发育主要受控于东亚季风降水的演化。研究表明在轨道时间尺度上，东亚季风演化及其导致的泥炭发育变化对全球CH₄浓度变化具有重要的贡献。

Peatland initiation in China associated with climate changes since the Last Glacial Maximum

As a key component of terrestrial ecosystem with organic-rich wetlands, the widespread establishment of peatland since the Last Glacial Maximum(LGM) represents the activation of a global carbon cycle. But the role of climate on peat initiation is poorly understood, especially between the peat initiation in low-middle latitudes and monsoon evolution at the orbital time scale, and its influence on the global CH4 concentration changes. In this study, we used the initiation of peatlands in China since the LGM based on the 91714C ages of basal peats and the method of time series of summed probability functions of regional peat initiation, including 211 ages for the southern China, 99 ages for the North China, 404 ages for the Northeast China, 24 ages for the Northwest China, and 179 ages for the Qinghai-Tibet Plateau, that were systematically collected the published ages of peat initiation following the criteria: (1) the upper part of the profile is continuous peat deposits; (2) peat thickness is more than 30cm; and (3) the maximum14C age at the bottom of peat was kept.
Our results show that peat initiation in southern China was occurred at the LGM, then gradually expanded to the North China, Northeast China, Northwest China, and Qinghai-Tibet Plateau during the Last Deglacial period. There was a significant spatial difference in peat development during the Holocene, peat initiation showed a continuous increase in the Northeast China and Northwest China; while peat initiation increased during the Early-Middle Holocene, and then showed a downward trend in the Southern China, North China and Qinghai-Tibet Plateau.