塔克拉玛干沙漠石油公路中段防沙体系粒度特征及沉积作用浅析  

Grain-size characteristics of aeolian deposits and sediment action in prevent-sand system of Taklimakan Desert Highway

作　　者：汪言在[1] 张春来[1] 董一帆[1] 郑影华[1] 

机构地区：[1]北京师范大学防沙治沙教育部工程研究中心,北京师范大学中国沙漠研究中心,北京100875

出　　处：《干旱区资源与环境》2009年第12期94-102,共9页Journal of Arid Land Resources and Environment

基　　金：国家科技支撑计划课题(2006BAD26B03);国家自然科学基金面上项目(40671185)资助

摘　　要：通过分析塔克拉玛干沙漠石油公路K290处防沙体系横断面沉积沙样粒度特征、粒度空间分异特征及沉积作用,得出如下结论:前沿阻沙栅栏内外两侧以粗沙沉积为主,固沙带内以细沙沉积为主,其中植物固沙带内粉沙含量较高,固沙带草方格沉积物分选性最好。在垂直方向,愈向表(0～1 cm)层细颗粒含量越多。对沙样跃移组分进行主成分分析及因子分析,结果表明,跃移组分第一主成分表征跃移组分最粗和最细两部分粒径的空间分布特征,其沉积受栅栏影响明显;第二主成分表征跃移组分中间粒径区间的沙粒分布特征,其沉积动力受栅栏与林带影响显著,受草方格影响微弱。主成分与平均粒径值回归分析表明,0～1 cm层与5～6 cm层第一主成分、10～11 cm层第二主成分对应的粒径区间是跃移组分的主要部分。因子分析结果显示,0～1 cm层、5～6 cm层因子载荷与10～11 cm层因子载荷所对应的粒径区间存在差异,其中10～11 cm层第一、第二因子载荷分别对应两个粒径区间,说明沉积作用复杂。Sand samples were collected in the section of prevent - sand system of Taklimakan Desert Highway at K290. Through analyzing the grain - size characteristics of samples, we drew some important conclusions. Firstly the clay and silt contents in surface layer of shelterbelt increased greatly and mean grain - size of samples became fine from moving sand area to shelterbelt due to the changes of the surface properties. We can get that the benefit of prevent - sand system was not weakening. Secondly, the sand sorting became better from moving sand area to fix -sand system, and the sand sorting in straw checkerboard area was the best, which was different from other＇s results because of smoothness of the platform in fix - system area at K290.

关 键 词：沙漠公路 防沙体系 粒度特征 

分 类 号：S727.23[农业科学—林木遗传育种]