塔克拉玛干沙漠腹地横向沙丘表面紧实度分异特征

doi:10.13866/j.azr.2016.03.29

摘要/Abstract

摘要： 沙丘表面紧实度是量化沙丘紧实程度的一个综合性指标,紧实度指标与沙丘的风蚀与堆积成因关系密切,对风成沙丘的形成具有重要意义。基于对塔克拉玛干沙漠腹地垄间平地的4种简单横向沙丘〔饼状沙丘(PD)、盾状沙丘(SD)、雏形新月形沙丘(PCD)、新月形沙丘(TCD)〕表面紧实度、容重、孔隙度和平均粒径的测量,通过最小显著差异法(LSD)分析和多重比较,对简单横向沙丘表面紧实度的空间分异特征及其形成机制进行了分析。研究结果表明:① 4种沙丘的沙面紧实度均具有较大的空间差异性,并且此差异性具有方向性,纵向差异性最大,横向差异较小;② 4种沙丘表面紧实度平均值表现为:盾状沙丘＞饼状沙丘＞雏形新月形沙丘＞新月形沙丘,而紧实度空间差异性却表现为:饼状沙丘＜盾状沙丘＜雏形新月形沙丘＜新月形沙丘,最大值和最小值点出现的位置也不同;③ 沙丘表面紧实度和容重、孔隙度具有很好的相关性,在质地相似的沙物质中,容重和孔隙度均可以作为衡量紧实度的指标。

关键词: 横向沙丘, 紧实度, 容重, 孔隙度, 空间分异, 塔克拉玛干沙漠

Abstract: Dune surface compactness is a comprehensive index,can be used to quantify the compaction degree at different parts of dune surface,and plays an important role in the formation of aeolian dune. In this paper,the space differentiation of surface compactness and formation mechanism of four kinds of simple transverse dunes were investigated by means of the Least Significant Difference method (LSD) and Multiple Comparison (MC) based on field measurements of dune morphology and surface compactness of four simple transverse dunes (PD,SD,PCD and TCD) on inter-dune corridors of complex ridges in hinterland of the Taklimakan Desert. The results are as follows: ① Space differentiation of surface compactness was different and had directionality for the four kinds of dunes. Longitudinal differentiation was the most significant,but the transverse one was not obvious; ② The mean surface compactness was in an order of SD>PD>PCD>TCD,while the space differentiation of compactness was just opposite. Moreover,the locations of the maximum value and minimum value were various; ③ There were the very good correlations among the dune surface compactness,bulk density and porosity. Therefore,for the similar sand material,compactness can reflect some physical properties well,such as bulk density,porosity and so on.

Key words: transverse dune, compactness, bulk density, porosity, spatial differentiation, Taklimakan Desert

贾文茹, 李生宇, 马学喜, 王宁波. 塔克拉玛干沙漠腹地横向沙丘表面紧实度分异特征[J]. 干旱区研究, 2016, 33(3): 664-671.

JIA Wen-ru, LI Sheng-yu, MA Xue-xi, WANG Ning-bo. Spatial Variation of Compaction on Transverse Dune Surface in Hinterland of the Taklimakan Desert[J]. Arid Zone Research, 2016, 33(3): 664-671.

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