湖北太白湖孢粉记录揭示的近1500年以来长江中下游地区的气候变化与人类活动

Climatic changes and human activities revealed by pollen records in Lake Taibai, Hubei Province, the middle and lower reaches of the Yangtze River region over the past 1500 years

太白湖TN1孔总长153cm岩芯的孢粉组合与炭屑指标,揭示了近1500年以来太白湖流域的植被经历了7个阶段的变化,对引起植被发生这种变化的主导因素探讨认为,520-1310AD期间,植被变化主要受气候变化的控制,人类活动的影响相对较弱;1310-1710AD期间,人类活动对植被的影响强度增加,为以自然控制为主向人类活动驱动为主转化的过渡期;1710AD以来,植被变化以人类活动驱动为主,反映的气候信号相对较弱.在孢粉组合所反映的气候变化中,具有520-720AD、1050-1310AD和自1950AD以来的三个暖期和720-1050AD、1310-1710AD期间的两个冷期.

Pollen analysis and charcoal indices ofa 153-cm-long lake sediment core from Lake Taibai （TN1 core） in Hubei Province disclosed seven stages of the vegetational changes in Lake Taibai drainage area over the past 1500 years. During 520-1310AD, the vegetational changes were mainly controlled by the climatic changes and the influence of human activities on vegetation was relatively weak. Stage of 1310-1710AD, the influencing intensity of human activities on vegetation gradually increased, and the stage was a transitional period of main factors from natural control to human activities drive. Since 1710AD, the vegetational changes were controlled by human activities and the climatic signal from the vegetational changes was relatively weak. According to the pollen assemblage, the climatic changes with three warm periods of 520-720AD, 1050-1310AD and since 1950AD and two cold periods of 720-1050AD and 1310-1710AD could be speculated.