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Development and carbon accumulation dynamics of a minerotrophic fen during the last millennium, northeast China
Catena ( IF 6.2 ) Pub Date : 2024-03-21 , DOI: 10.1016/j.catena.2024.107976 Yanmin Dong , Hongkai Li , Zhiwei Xu , Lu Yu , Yuhan Yang , Shengzhong Wang
Catena ( IF 6.2 ) Pub Date : 2024-03-21 , DOI: 10.1016/j.catena.2024.107976 Yanmin Dong , Hongkai Li , Zhiwei Xu , Lu Yu , Yuhan Yang , Shengzhong Wang
Peatlands are terrestrial ecosystems with high carbon sequestration efficiency, providing critical feedback on climate change. It is crucial to understand how peatland development and carbon accumulation respond to various factors to reveal the future direction of carbon reservoirs under changing climatic conditions. To assess the impact of climate and hydrological conditions on the development and carbon accumulation of peatlands, 15 peat core samples were analyzed to examine the processes of lateral expansion in the Dongfanghong (DFH) peatland, a minerotrophic fen located in the Changbai Mountains of northeast China. Accelerator Mass Spectrometry C, total organic carbon, dry bulk density, testate amoebae, δC of α-cellulose in spp. and plant macrofossil analyses were conducted on a high-resolution peat core. The proxies were used to calculate carbon accumulation rate (CAR) and reconstruct water table depth as well as surface moisture and vegetation development of the DFH peatland. Our findings indicated that the DFH peatland was initiated at 1011 cal. CE and experienced paludification during the last millennium. The expansion of the DFH peatland was primarily determined by hydrological conditions rather than climatic factors such as total solar irradiance and regional temperature. The rapid expansion between 1500 and 1700 cal. CE was likely resulted from relatively low precipitation and a decrease in water table/surface moisture. CAR generally correlated with total solar irradiance, regional temperature, and precipitation, suggesting that climate may be crucial for CAR in DFH peatlands over multi-centennial timescales. However, the increased CAR under relatively dry conditions suggested that the CAR were regulated by hydrological conditions over a centennial timescale. This study highlighted the important roles of climate and hydrological conditions in the lateral expansion and CAR of the peatland in minerotrophic fen and that there may be a threshold for hydrology during the process of peatland development and carbon accumulation.
更新日期：2024-03-21
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