Liu Suzhen, Deng Chenglong, Xiao Jule, Li Jinhua, Paterson Greig A, Chang Liao, Yi Liang, Qin Huafeng, Pan Yongxin, Zhu Rixiang
1] State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [2] University of Chinese Academy of Sciences, Beijing 100049, China.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
Sci Rep. 2015 Jan 23;5:8001. doi: 10.1038/srep08001.
The Holocene Warm Period (HWP) provides valuable insights into the climate system and biotic responses to environmental variability and thus serves as an excellent analogue for future global climate changes. Here we document, for the first time, that warm and wet HWP conditions were highly favourable for magnetofossil proliferation in the semi-arid Asian interior. The pronounced increase of magnetofossil concentrations at ~9.8 ka and decrease at ~5.9 ka in Dali Lake coincided respectively with the onset and termination of the HWP, and are respectively linked to increased nutrient supply due to postglacial warming and poor nutrition due to drying at ~6 ka in the Asian interior. The two-stage transition at ~7.7 ka correlates well with increased organic carbon in middle HWP and suggests that improved climate conditions, leading to high quality nutrient influx, fostered magnetofossil proliferation. Our findings represent an excellent lake record in which magnetofossil abundance is, through nutrient availability, controlled by insolation driven climate changes.
全新世暖期（HWP）为气候系统以及生物对环境变化的响应提供了宝贵的见解，因此可作为未来全球气候变化的一个绝佳参照。在此我们首次记录到，温暖湿润的全新世暖期条件对半干旱的亚洲内陆地区的磁化石增殖极为有利。大理湖磁化石浓度在约9.8 ka时显著增加，在约5.9 ka时降低，这分别与全新世暖期的开始和结束相吻合，并且分别与冰期后变暖导致的营养供应增加以及亚洲内陆地区在约6 ka时因干旱导致的营养匮乏有关。约7.7 ka时的两阶段转变与全新世暖期中段有机碳的增加密切相关，这表明气候条件改善，导致高质量营养物质流入，促进了磁化石的增殖。我们的研究结果代表了一个出色的湖泊记录，其中磁化石丰度通过营养物质的可获得性，受日照驱动的气候变化控制。
