地理研究 ›› 2014, Vol. 33 ›› Issue (4): 643-653.doi: 10.11821/dlyj201404005

• 论文 • 上一篇    下一篇

广东惠州黄洞水库沉积物特征及其反映的近50年土壤侵蚀意义

张晴华1, 王红亚1, 徐琳1, 郑卓2, 杨士雄2, 陈效逑1   

  1. 1. 北京大学城市与环境学院, 北京 100871;
    2. 中山大学地球科学系, 广州 510275
  • 收稿日期:2013-10-10 修回日期:2014-02-25 出版日期:2014-04-10 发布日期:2014-04-10
  • 通讯作者: 陈效逑(1958-),男,教授,主要从事气候变化及其生态响应等研究。E-mail:cxq@pku.edu.cn E-mail:cxq@pku.edu.cn
  • 作者简介:张晴华(1988-),女,内蒙古呼和浩特,硕士,主要从事环境变化、陆地生态系统响应等研究。E-mail:zhang.qing.hua@qq.com
  • 基金资助:
    国家自然科学基金项目(41071027,40871029)

Characteristics of sediment from Huangdong Reservoir in Huizhou, Guangdong Province and their implications on soil erosion during the past 50 years

ZHANG Qinghua1, WANG Hongya1, XU Lin1, ZHENG Zhuo2, YANG Shixiong2, CHEN Xiaoqiu1   

  1. 1. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;
    2. Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China
  • Received:2013-10-10 Revised:2014-02-25 Online:2014-04-10 Published:2014-04-10

摘要: 在广东省东南部惠州市的黄洞水库中取得沉积物柱芯,对其样品做了210Pb 和137Cs 比活度分析、粒度分析和孢粉及炭屑分析,并收集了这一水库邻近气象站的降水数据,计算了1960 年以来的年降水量、夏季(6-9 月) 降水量和24 小时暴雨量。利用上述210Pb和137Cs比活度分析结果建立了沉积物剖面的年代框架,结合孢粉浓度、炭屑浓度与降水量计算结果,对沉积剖面的粒度变化做出了解译,并初步推测1960-2009 年间水库所在流域的土壤侵蚀变化情况及其原因。研究表明,在该亚热带丘陵地区植被覆盖度较高的自然条件下,侵蚀作用对降水量波动和植被(尤其是乔木、灌木等木本植物) 覆盖度变化的响应十分灵敏,水库沉积物的粒度变化在一定程度上可以反映流域内土壤侵蚀相对强度的变化。

关键词: 广东惠州, 黄洞水库, 沉积物, 土壤侵蚀

Abstract: Sediment cores were obtained from Huangdong Reservoir in Huizhou City, southeast of Guangdong Province. Specific activity analysis of 210Pb and 137Cs, particle-size analysis, pollen and charcoal analysis were conducted on specimens of this sediment sequence. In addition, precipitation data were collected from a nearby meteorological station and annual precipitation, summer (June-September) precipitation and 24 hours' torrential rain volume were calculated for the period since 1960 based on the collected data. A chronological framework was established for the sediment sequence using results of the specific activity analysis of 210Pb and 137Cs. Based on the pollen and charcoal concentration and precipitation data, the particle-size variations of this sediment sequence were interpreted, and the causes for soil erosion in the catchment of this reservoir during 1960-2009 were preliminarily inferred. The results showed that the response of soil erosion to fluctuations of precipitation and changes in vegetation coverage (especially trees and shrubs) in the catchment was very sensitive in the high vegetation coverage conditions of subtropical hilly areas. Moreover, the particle-size variations of reservoir-sediments can reflect the changes of relative intensity in soil erosion to some extent.

Key words: Huizhou, Guangdong Province, Huangdong Reservoir, sediment, soil erosion