摘要
厚田沙地是亚热带湿润地区的典型风沙化土地,分析不同地貌部位沉积物的粒度特征,有助于探讨其分布规律与影响因素。结果表明:厚田沙地沉积物主要由中沙和粗沙组成,平均粒径为1.28Ф,分选性较差,呈正偏和窄峰态分布,整体表现为距赣江越远,细颗粒含量增多,粗颗粒含量减少,平均粒径逐渐变细。不同地貌部位沉积物的粒度特征存在较大差异:迎风坡风力作用强劲,侵蚀强烈,导致细颗粒较少、平均粒径较粗,表层相对20 cm深度更粗;背风坡由于风力涡旋而沉积较多细颗粒,平均粒径较细,表层相对20 cm深度更细;前丘顶与平沙地不仅受到风力侵蚀,也是人工活动强烈区,导致平均粒径变化较大,但大部分表层比20 cm深度更粗。
The Houtian sandy land is a typical aeolian land in subtropical humid areas,and the analysis of grain size characteristics of sediments in different geomorphological positions contribute to exploring distribution rules and influencing factors. The results show that sediments in the Houtian sandy land are mainly composed of medium and coarse sand,with an average particle size of 1.28 Ф,poor sorting,a coarse skewness and narrow kurtosis distribution. The overall performance is as follows:the farther away from the Ganjiang River,the content of finer particles is rising and coarse particles presented an opposite trend,meanwhile,the tendency of the average particle size decreases gradually. There are significant differences in the grain size characteristics of sediments in various geomorphological positions:the windward slope is affected by strong wind erosion,resulting in fewer fine particles and coarser average particle size,which sediments of surface layer were coarser than the depth of20 cm;the leeward slope is deposited more fine particles due to wind vortex as well as the average particle size is finer,which sediments of surface layer are finer than the depth of 20 cm;the top of dunes and flat sandy land is not only eroded by wind,but affected by intense artificial activities,resulting in a significant differences in average particle size,most of sediments of surface layer are still coarser than the depth of 20 cm.
作者
李向洁
李志文
詹江振
孙丽
杜兰
侯楚
Li Xiangjie;Li Zhiwen;Zhan Jiangzhen;Sun Li;Du Lan;Hou Chu(School of Earth Science,East China University of Technology,Nanchang 330013,China;School of Environmental and Chemical Engineering,Foshan University,Foshan 528225,Guangdong,China)
出处
《中国沙漠》
CSCD
北大核心
2021年第2期92-99,共8页
Journal of Desert Research
基金
国家自然科学基金项目(41201006,41571007)
江西省数字国土实验室开放基金项目(DLLJ201913)
江西省研究生创新基金项目(YC2020-S483)。
关键词
厚田沙地
沉积物
地貌部位
粒度特征
Houtian sandy land
sediments
geomorphological positions
grain size characteristics
