Citation: | SONG Yunhong, LIU Kai, DAI Huimin, XU Jiang, ZHANG Zhehuan, LIANG Shuai. Palynological assemblages of typical black soil profile in the eastern Songliao Plain and their age and its implication for paleoclimatic[J]. Geological Bulletin of China, 2022, 41(9): 1528-1538. doi: 10.12097/j.issn.1671-2552.2022.09.003 |
Natural black soil area is an important geological record of environmental evolution and climate change.Studying the formation of the black soil area and the evolution of the paleoclimatic environment, and knowing how the black soil came from, is of great significance for the sustainable use of black soil resources and protecting the large granary in the Northeast.Fifteen sporopollen samples were collected from a typical black soil profile in the Helen area of the eastern Songnen Plain for pollen research, and total organic carbon in soil samples from the same stratum was AMS14C dated.2 sporo-pollen assemblages which represented by Echinate Asteraceae-Artemisia-Boraginaceae-Pinus of lower part and Pinus-Amaranthaceae-Artemisia of upper part were identified from the typical black soil profile after systematical analysis, identification and research.AMS14C dating indicates that the typical black soil in the Helen area of the eastern Songnen Plain is a product of the Middle Holocene and the early Late Holocene.Comprehensive element geochemistry, paleontology, and spore pollen analysis indicate that the typical black soil was mainly formed during the warm period since 7400 a B.P. in the Holocene.Which Formed in the warm and semi-humid climate of the Songnen Plain, the vegetation is mainly grassland vegetation with herbaceous shrubs.
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The sampling position of typical black soil profile in Hailun area
Pollen percentage diagram of Hailun black soil profile PM1908
Pollen percentage diagram of Hailun black soil profile PM1910
Relationship between depth and age of Hailun black soil profile
Palaeoclimate evolution map reflected by palynology