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MENG Qingtao,born in 1984,Ph.D.,professor,engaged in sedimentology,petroleum geology,unconventional oil/gas reservoir formation theory & resource assessment,Meso-Cenozoic climate,environment,and carbon cycle research. E-mail: mengqt@jlu.edu.cn.
Outline
The Eocene represents a critical interval for understanding the evolution of the global carbon cycle. During this period,Northeast China experienced significant fluctuations in atmospheric CO2 concentrations,ranging from 454 to 1861 μmol/mol. While these variations underscore the region’s importance in carbon cycle research,current understanding of carbon cycling in terrestrial lake systems remains limited. Most studies have focused on modern lakes since the Pleistocene,leaving a notable gap in systematic research on carbon cycling in ancient lacustrine basins such as those of the Eocene. This study integrates multiple geochemical proxies with a quantitative carbon source-sink flux model to reconstruct organic carbon burial and carbon emissions in the Yilan paleo-lake basin during the Early Eocene Climatic Optimum(EECO)and the Middle Eocene Climatic Optimum(MECO)events. The findings reveal that the Yilan Basin exhibited peak primary productivity,organic carbon burial rates,and CO2 emissions from fossil carbon oxidation during the EECO. Despite substantial carbon release during these events,the net carbon fixed via photosynthesis(reaching 241650 Mt during the EECO)and the resulting buried organic carbon(~4028 Mt during the EECO)significantly exceeded CO2 emissions from fossil carbon oxidation(~1448 Mt during the EECO). Therefore,the Yilan Basin functioned as a net carbon sink in Northeast China during the EECO and MECO,serving as an important natural regulator of regional climate.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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