Abstract
Reconstructing the spatial patterns of regional climate and vegetation during specific intervals in the past is important for assessing the possible responses of the ecological environment under future global warming scenarios. In this study, we reconstructed the history of regional vegetation and climate based on six radiocarbon-dated pollen records from the North China Plain. Combining the results with existing pollen records, we reconstruct the paleoenvironment of the North China Plain during the Last Glacial Maximum (LGM) and the Holocene Climatic Optimum (HCO). The results show that changes in the regional vegetation since the LGM were primarily determined by climatic conditions, the geomorphic landscape and by human activity. During the LGM, the climate was cold and dry; mixed broadleaf-coniferous forest and deciduous-evergreen broadleaf forest developed in the southern mountains, and cold-resistant coniferous forest and mixed broadleaf-coniferous forest were present in the northern mountains. The forest cover was relatively low, with mesophytic and hygrophilous meadow occupying the southern part of the plain, and temperate grassland and desert steppe were distributed in the north; Chenopodiaceae-dominated halophytes grew on the exposed continental shelf of the Bohai Sea and Yellow Sea. During the HCO, the climate was warm and wet; deciduous broadleaf forest and deciduous-evergreen broadleaf forest, with subtropical species, developed in the southern mountains, and deciduous broadleaf forest with thermophilic species was present in northern mountains. Although the degree of forest cover was greater than during the LGM, the vegetation of the plain area was still dominated by herbs, while halophytes had migrated inland due to sea level rise. In addition, the expansion of human activities, especially the intensification of cultivation, had a significant influence on the natural vegetation. Our results provide data and a scientific basis for paleoclimate modelling and regional carbon cycle assessment in north China, with implications for predicting changes in the ecological environment under future global warming scenarios.
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Acknowledgements
We sincerely thank two anonymous reviewers for their valuable comments and suggestions, Professors Chen Wu and Jingsong Liu for providing some of the data and figures, Dr. Yaoliang Liu for helping with field work, Dr. Hideki Yamagata for helping with AMS 14C dating, and Dr. Jan Bloemendal for improving the English language. This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA05120202), the National Natural Science Foundation of China (Grant Nos. 41702184 & 41630753), the National Key Research and Development Program of China (Grant No. 2017YFA0603403) and the Science Foundation of Hebei Normal University (Grant No. L2018B29).
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Li, M., Zhang, S., Xu, Q. et al. Spatial patterns of vegetation and climate in the North China Plain during the Last Glacial Maximum and Holocene climatic optimum. Sci. China Earth Sci. 62, 1279–1287 (2019). https://doi.org/10.1007/s11430-018-9264-2
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DOI: https://doi.org/10.1007/s11430-018-9264-2