干旱区生态环境知识资源中心(Arid): 中国东部沙区表层沉积物粒度特征

Arid

	中国东部沙区表层沉积物粒度特征
其他题名	Grain-size Characteristics of Surface Sediments in the Eastern Desert Regions of China
	沈亚萍; 张春来; 李庆; 贾文茹; 李姣; 田金鹭
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2016
卷号	36 期号:1 页码:150-157
中文摘要	通过分析中国东部沙区表层沉积物粒度特征及其与风力、植被覆盖的相关性,探讨了东部沙区现代风沙沉积环境及其区域差异性。结果显示:东部沙区各沙漠/沙地粒径级配相对一致,均以细沙、中沙为主,粒度分布整体呈单峰形态,中等分选,粒度分布和分选性均与西部沙区有较大不同。风力和植被覆盖状况的差异决定了各沙地所处的风沙环境性质和风沙活动强度不同,导致东部沙区表层沉积物粒度特征存在明显的区域差异性。其中,库布齐沙漠粒度特征与该区风蚀、搬运、堆积过程频繁交替的风沙活动方式密切关联;呼伦贝尔沙地粒度特征反映了风蚀主导的风沙环境;科尔沁沙地、浑善达克沙地、毛乌素沙地粒度特征和风沙活动方式相对复杂,与这3个沙地内部风蚀主导区和沙尘沉降主导区镶嵌分布的格局有关。东部沙区表层沉积物平均粒径和分选系数均与沙地年均风速和植被总盖度双因素之间具有显著的非线性相关性。
英文摘要	By analyzing grain-size characteristics of surface sediments as related to wind force and vegetation cover in the eastern sand area of China,this paper discussed the modern aeolian sedimentary environment and the regional differences.The results show that with a unimodal distribution pattern the grain-size of the surface sediments of each desert and sandy land in the eastern desert regions is similar.All of the surface sediments are mainly composed of fine sand and medium sand and moderately sorted.Both grain-size composition and sorting differ from those of the western deserts.Controlled by the properties of the aeolian environment and the intensity of aeolian activities that were determined mainly by wind force and vegetation cover,grain-size characteristics of the surface sediments exhibit regional difference in the eastern desert regions. Specifically,grain-size in the Hobq Desert implies a typical desert environment that is characterized by frequent alternating processes of wind erosion,particle transportation and deposition;In the Hulunbeir Sandy Land,it is characterized by a wind erosion dominated aeolian environment;In the Otindag Sandy Land,Horqin Sandy Land and Mu Us Sandy Land,grain-size and aeolian activities are relatively complex, which is related to the mosaic distribution pattern of wind erosion dominated areas and aeolian deposition dominated areas.Statistics shows that both the mean grain-size and the sorting of the surface sediments significantly correlated to the annual average wind speed and the total vegetation coverage in the eastern desert regions.
中文关键词	东部沙区 ; 粒度 ; 风沙环境 ; 区域差异
英文关键词	eastern desert regions grian-size aeolian environment regional difference
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:5636756
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235380
作者单位	北京师范大学, 地表过程与资源生态国家重点实验室;;防沙治沙教育部工程研究中心, 北京 100875, 中国
推荐引用方式 GB/T 7714	沈亚萍,张春来,李庆,等. 中国东部沙区表层沉积物粒度特征[J]. 北京师范大学,2016,36(1):150-157.
APA	沈亚萍,张春来,李庆,贾文茹,李姣,&田金鹭.(2016).中国东部沙区表层沉积物粒度特征.中国沙漠,36(1),150-157.
MLA	沈亚萍,et al."中国东部沙区表层沉积物粒度特征".中国沙漠 36.1(2016):150-157.