Holocene vegetation dynamics in response to climate change and human activities derived from pollen and charcoal records from southeastern China
Holocene vegetation dynamics in response to climate change and human activities derived from pollen and charcoal records from southeastern China
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DOI：
10.1016/j.palaeo.2017.06.035
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发表时间：
2017-11
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通讯作者：
Lin Zhao;Chunmei Ma;C. Leipe;Tengwen Long;Kam‐biu Liu;Huayu Lu;Lingyu Tang;Yu Zhang;Mayke Wagner;P. Tarasov
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文献类型：
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作者：
Lin Zhao;Chunmei Ma;C. Leipe;Tengwen Long;Kam‐biu Liu;Huayu Lu;Lingyu Tang;Yu Zhang;Mayke Wagner;P. Tarasov
我们对东亚夏季风（EASM）的全新世演化及其与人类活动的关系的了解仍然不完整。对戴云山自然保护区（约北纬 25°38′–25°44′，东经 118°05′–118°21′，福建省）两个沉积物剖面的详细孢粉学调查表明，东亚夏季风控制的副热带气候条件在全新世早期和中期比现在更加湿润和温暖。 5700 卡路里后 今年 BP，非树栖花粉和蕨类孢子百分比的稳步增加意味着 EASM 的减弱。总体气候趋势被 8200、7200、6300 和 4400 年左右树栖花粉类群的组成和浓度的几个世纪规模的变化所打断。 yr BP，与 EASM 氧同位素记录所示的较弱降水（和较低温度）一致。我们的结果进一步支持了这样的假设：直到 3000 年，中国南方的自然植被覆盖才受到人类活动的显着影响。 年血压。花粉记录表明森林覆盖面积迅速减少。 3000–2450 卡路里 BP 之后是普遍开放的（农业）景观和次生松林的蔓延。这种模式与该地区以稻米为基础的农业向南扩张所推动的人口大幅增长相一致，这种增长比广泛接受的“全新世最佳气候”晚了几千年。这凸显了该术语的多维意义，该术语常用于古环境和考古研究，因此应针对正在考虑的具体问题来应用。
Our knowledge about the Holocene evolution of the East Asian summer monsoon (EASM) and its relation to human activities remains incomplete. A detailed palynological investigation of two sediment sections from the Daiyun Mountain Nature Reserve (ca. 25°38′–25°44′N, 118°05′–118°21′E, Fujian Province) suggests EASM-controlled subtropical climate conditions that were wetter and warmer than present over the early and middle Holocene. After 5700 cal. yr BP, steadily increasing non-arboreal pollen and fern spore percentages imply an attenuation of the EASM. The general climate trend is interrupted by several century-scale changes in composition and concentration of arboreal pollen taxa around 8200, 7200, 6300, and 4400 cal. yr BP, coinciding with weaker precipitation (and lower temperature) as suggested by the EASM oxygen isotope record. Our results further support the hypothesis that the natural vegetation cover of southern China was not markedly affected by human activities until 3000 cal. yr BP. The pollen records suggest a quick decrease in the forest cover ca. 3000–2450 cal. yr BP followed by a generally open (agricultural) landscape and spread of secondary pine forests. This pattern is in line with a major population growth promoted by the southward expansion of rice-based agriculture across the region that postdates the widely accepted ‘Holocene climate optimum’ by several millennia. This highlights the multidimensional significance of this term, which is commonly used in palaeoenvironmental and archaeological studies and should be consequently applied with respect to the specific issue under consideration.