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惠州黄洞水库沉积速率及孢粉的环境指示意义

1. 1. 中山大学地球科学系,广东 广州 510275
2. 广州地理研究所,广东 广州 510070
3. 河北师范大学资源与环境科学学院,河北 石家庄 050016
• 收稿日期:2013-01-02 修回日期:2013-04-21 出版日期:2013-10-20 发布日期:2013-10-20
• 作者简介:

作者简介：陈碧珊（1982-）,女,广东汕头人,博士研究生,主要从事第四纪孢粉、环境演变与生物响应研究。E-mail:chenbishan2008@126.com

• 基金资助:
国家自然科学基金（41230101;40730103）及中山大学中央高校基本科研业务费专项资金（10lgzd08）资助

Sedimentation Rate and Environmental Reconstruction Based on Grain-size and Pollen-spores Analysis from Huangdong Reservior, Huizhou

Bi-shan CHEN1(), Zhuo ZHENG1(), Kang-you HUANG1, Yan-wei ZHENG2, Qing-hai XU3, Qing-hua ZHANG1, Xu-lei HUANG1

1. 1.Department of Earth Science, Sun Yat-sen University, Guangzhou, Guangdong 510275, China
2.Guangzhou Institute of Geography, Guangzhou, Guangdong 510070, China
3.College of Resources and Environment of Hebei Normal University,Shijiazhuang, Hebei 050016, China
• Received:2013-01-02 Revised:2013-04-21 Online:2013-10-20 Published:2013-10-20

Abstract:

A sediment core was collected from the northeast of the Huangdong Reservoir in Huizhou, Guangdong province. Environmental 137Cs and 210Pb dating techniques (mainly with 137Cs) were applied to determine the chronology and modern sedimentation rates of the Huangdong Reservoir, by combining with the sediment lithology, grain size and the historical data on the construction of the reservoir. Meanwhile, a lab analysis was conducted on the pollen analysis and charcoal to explore the significances to the environment and reveal the past environmental changes, vegetation and ecological conditions of the reservoir. The grain size analysis result showed that the sedimentation rate was faster (approximately 1.5 cm/a) before the construction of the reservoir; and it decreased (approximately 1.0 cm/a) after the construction of the reservoir(since 1960s). The records on pollen assemblages and charcoal revealed that the pollens of herbs (such as Gramineae), spores of fern (such as Dicranopteris dichotoma) and Pinus were relative with the human activities. The concentration of pollen and AP/NAP ratios (arboreal pollen/non-arboreal pollen) were the important indicators to reveal the changes of the forest coverage. Human activities’ influence on vegetation was manifested in the decrease in pollens of tree, the drop in the total concentration of pollens, the increase in pollens of herbs. And it showed that the bare land or water and soil loss increased significantly if humans cut down and burned frequently. Significant large areas of forest fire events could be according to peak value of charcoal concentration as well as the C/P value (ratio of charcoal and pollen). This study revealed the vegetation ecological information of three different stages in the basin, i.e. the period before the construction of the reservoir, the period of Great Leap Forward and the Cultural Revolution, and the subsequent period of reform and opening up. Such information uncovered the changes of human activities in modes and intensities in different historical periods. The results of pollen assemblages and charcoal index analysis were consistent with the main events of the great Steel-Making movement in 1958, the hundred-year drought in 1963, and the afforestation project in 1986 which were recorded in the historical documents.

• P343.3