新疆策勒绿洲-沙漠过渡带不同植被下的沙丘形态特征及沉积物粒度分析
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P931.3

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教育部人文社会科学研究规划基金项目(18YJAZH064);新疆师范大学人文社会科学重点研究基地丝绸之路经济带城市发展研究中心招标项目(XJNURWJD2019A06);新疆师范大学"十三五"校级重点学科地理学招标项目(17SDKD0701)


Morphological Characteristics and Sediment Particle Size Analysis of Sand Dunes with Different Vegetations in the Cele Oasis-Desert Ecotone, Xinjiang
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    摘要:

    新疆策勒绿洲—沙漠过渡带为典型的极端干旱区,风是最主要的搬运动力,风蚀和沙尘暴对土壤沙粒的搬运和堆积造成了土地沙化和荒漠化。运用回归分析和相关分析方法,探讨不同灌丛沙堆风沙沉积物的沉积规律和沙丘发育的影响因素,对不同植被下的沙丘形态特征及沉积物粒度进行分析。结果表明:(1)在不同植被覆盖度下,柽柳比骆驼刺灌丛沙堆的沙物质粒径分布均匀,柽柳和骆驼刺分选的沙物质粒径最粗分别为高覆盖度下和中覆盖度下,最细均为低覆盖度下。(2)沙丘和障碍物演化过程中,高度、长度、宽度三者之间协同变化,相互影响、相互反馈。障碍物的高度和宽度与沙丘长度、宽度和高度之间均存在显著关系,植株的大小影响沙丘形态的发育。(3)风影和灌丛沙丘的沙物质主要由极粗粉砂、极细砂和细砂组成,回涡沙丘的沙物质主要由极细砂和细砂组成,其余粒级沙粒含量很少,均不足5%。从植被类型解析,沙物质粗细为柽柳>骆驼刺>花花柴;从沙丘类型分析,沙物质粗细为回涡沙丘>灌丛沙丘>风影沙丘。(4)沙丘沙物质平均分选系数介于1.42~1.60,属于中等偏上—中等分选性,沙物质偏度平均值介于0.01~0.20,属于对称,沙物质峰态平均值介于0.96~1.07,属于常峰态。(5)沙丘沙物质分选系数与偏度值均呈极显著相关(R2>0.70,p<0.01),沙物质平均粒径与分选系数和偏度值均呈极显著相关(p<0.01)。研究结果对深入理解不同植被下的灌丛沙堆表面沉积物粒度特征和沙丘形态的发育具有重要的意义。

    Abstract:

    The Cele Oasis-Desert Ecotone in Xinjiang is a typical extreme arid zone, where wind is the most important driving force of land desertification caused by the transport and accumulation of soil sand grains by wind erosion and sandstorms. Regression analysis and correlation analysis methods were used to investigate the sedimentation law and influencing factors of sand dune development of aeolian sand dunes in different shrublands, and the morphological characteristics and sediment particle size of sand dunes under different vegetations were also analyzed. The results showed that: (1) Under different vegetation cover, Tamarix chinensis was more uniformly distributed than the sand particle size of the sand pile of Alhagi sparsifolia shrubs, and the coarsest particle size of the sand material sorted by Tamarix chinensis and Alhagi sparsifolia appeared under the high and medium coverage respectively, and both the finest appeared under the low coverage. (2) In the evolution process of dunes and obstacles, all the height, length and width changed in synergy, influencing each other and giving feedback to each other. There was a significant relationship between the height and width of the obstacle and the length, width and height of the dune, and the size of the plant affected the development of the dune morphology. (3) The sand material of wind shadow and shrub dunes was mainly composed of extremely coarse silt sand, extreme fine sand and fine sand, and the sand material of the whirlpool sand dunes was mainly composed of extremely fine sand and fine sand, and the remaining granular sand particle content was very small, less than 5%. From the analysis of vegetation types, the thickness of sand material was Tamarix chinensisAlhagi sparsifoliaKarelinia caspia, and from the analysis of sand dune types, the thickness of sand matter was echo dunes>shrub dunes>wind shadow dunes. (4) The average sorting coefficient of sand dune sand material was between 1.42 and 1.60, which belonged to the upper middle to medium sorting, the average deviation of sand as iws between 0.01 to 0.20, which belongd to symmetry, and the peak state average of sand matter was between 0.96 to 1.07, which belongd to the constant peak state. (5) The sorting coefficients and skewness values of sand dunes were significantly correlated (R2>0.70, p<0.01), and the average particle size of sand substances was significantly correlated with the sorting coefficient and skewness value (p<0.01). The results are of great significance for the in-depth understanding of the particle size characteristics of sediment surface sediments and the development of dune morphology in shrubland dunes under different vegetations.

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何强强,毛东雷,朱文煜,徐佳瑞,张凯丽,张勇,赛亚热·赛都拉.新疆策勒绿洲-沙漠过渡带不同植被下的沙丘形态特征及沉积物粒度分析[J].水土保持学报,2022,36(6):70~81

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  • 收稿日期:2022-03-22
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  • 在线发布日期: 2022-12-01
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