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应用生态学报 ›› 2009, Vol. 20 ›› Issue (10): 2461-2467.

• 研究报告 • 上一篇    下一篇

黄土高原小流域淤地坝泥沙粒度的剖面分布

汪亚峰1**;傅伯杰1;陈利顶1;吕一河1;王德2;宋成军1   

  1. 1中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085;2中国科学院烟台海岸带可持续发展研究所, 山东烟台 264003
  • 出版日期:2009-10-19 发布日期:2009-10-19

Profile distribution of sediment particle sizes at a check dam in a small watershed of Loess Plateau

WANG Ya-feng1|FU Bo-jie1|CHEN Li-ding1|Lü|Yi-he1|WANG De2|SONG Cheng-jun1   

  1. 1State Key Laboratory of Urban and Regional Ecology, Research Center for EcoEnvironmental Sciences, Chinese Academy of Sciences, Beijing
     100085, China|2Yantai Coastal Zone Research Institute for Sustainable Development, Chinese Academy of Sciences, Yantai 264003, Shandong, China
  • Online:2009-10-19 Published:2009-10-19

摘要: 2006年6月,按照泥沙旋回分层连续取样,分析了黄土高原丘陵沟壑区典型小流域1954年修建的淤地坝泥沙粒径的剖面分布特征.结果表明:该坝地泥沙旋回至少28个,旋回层的厚度范围在2~60 cm;沉积剖面土壤粒径以粉砂(0.05~0.002 mm)为主,占60%以上,其粒径集中分布于0.01~0.05 mm,粗泥沙(粒径>0.05 mm)含量约占23.09%;随淤积深度的增加,泥沙各粒径范围的变异程度增加,2 m土壤深处可作为研究区淤地坝粒径变异突变点的标识,粒径变异是河道比降和水沙动力条件共同作用的结果;研究区淤地坝泥沙沉积剖面存在72 cm厚的累积耕作层,累积耕作层的明确对于淤地坝泥沙侵蚀环境具有指示作用.

关键词: 黄土高原, 淤地坝, 泥沙粒度, 旋回层次, 侵蚀过程, 玉米, 杂交种, 阴湿, 指标

Abstract: Sediment gyration sampling was conducted in June 2006 to analyze the profile distribution of sediment particle sizes at a check-dam built in 1954 in
a typical small watershed of hilly and gully Loess plateau. There were at least 28 layers of sediment gyration at the check-dam, with the layer depth varied from 2 cm to 60 cm. In the sediment profile, silt (0.05-0.002 mm) occupied >60%, its particle size being mainly within the range of 0.01-0.05 mm, while coarse sand (>0.05 mm) accounted for 23.09%. The variation degree of sediment particle sizes increased with increasing depth, an
d an abrupt change was observed at the depth 2 m. Both longitudinal gradient and hydrodynamic condition caused the variation of sediment particle sizes. There was an accumulated plough layer of 72 cm thickness in the profile, which had indicative role for the sediment erosion environment of check dam.

Key words: Loess Plateau, check dam, sediment particle size, gyration, erosion process, maize, hybrid, shade-humid environment, index.