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中国沙漠 ›› 2023, Vol. 43 ›› Issue (4): 55-63.DOI: 10.7522/j.issn.1000-694X.2023.00002

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柴达木盆地南缘死亡蛛丝蓬( Halogeton arachnoideus )风影沙丘形态和沉积特征

许瑞聪(), 董治宝(), 南维鸽, 陈国祥, 杨馥宁, 孔玲玲   

  1. 陕西师范大学 地理科学与旅游学院,陕西 西安 710119
  • 收稿日期:2022-12-09 修回日期:2023-01-03 出版日期:2023-07-20 发布日期:2023-08-14
  • 通讯作者: 董治宝
  • 作者简介:董治宝(E-mail: zbdong@snnu.edu.cn
    许瑞聪(1997—),女,陕西商洛人,硕士研究生,研究方向为风沙地貌。E-mail: xrc18829878534@163.com
  • 基金资助:
    国家自然科学基金项目(42171004);第二次青藏高原综合科学考察研究项目(2019QZKK0403)

Morphology and sedimentary characteristics of shadow dunes of dead Halogeton arachnoideus in the southern margin of Qaidam Basin, China

Ruicong Xu(), Zhibao Dong(), Weige Nan, Guoxiang Chen, Funing Yang, Lingling Kong   

  1. School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
  • Received:2022-12-09 Revised:2023-01-03 Online:2023-07-20 Published:2023-08-14
  • Contact: Zhibao Dong

摘要:

蛛丝蓬(Halogeton arachnoideus)死亡后仍能保持直立且发挥固沙效应。在野外实地考察和粒度实验的基础上运用相关统计方法,分析了柴达木盆地南缘地区死亡蛛丝蓬风影沙丘的形态和沉积特征。结果表明:(1)风影沙丘各参数之间相关性显著(P<0.01),其中沙丘垂向与水平尺度相关性较好,沙丘长度与宽度的拟合关系(R2 =0.6)好于其他参数。(2)死亡蛛丝蓬与风影沙丘各形态参数之间呈显著正相关(0.8≥r>0.5,P<0.01,疏通度除外),蛛丝蓬长度和宽度对沙丘长度延伸的贡献度在逐渐降低,而高度的贡献度不断增大。(3)蛛丝蓬的冠幅面积、长度、疏通度与风影沙丘体积呈显著相关(P<0.01),其中冠幅面积与体积拟合关系较好(R2=0.8),它们共同作用了蛛丝蓬对沙子的截留能力。(4)蛛丝蓬风影沙丘沉积物主要粒级为极细沙和细沙,在植株的影响下风力逐渐减小,沿风向沉积物粒径逐渐变粗。

关键词: 风影沙丘, 蛛丝蓬(Halogeton arachnoideus), 形态特征, 粒度特征, 柴达木盆地

Abstract:

The dead Halogeton arachnoideus can still remain upright and play a role in sand fixation, making it a hotspot in the study of wind prevention and sand fixation in arid and semi-arid regions. On the basis of field investigation and grain size experiment, this paper analyzes the morphological and sedimentary characteristics of the shadow dunes of H. arachnoideus, a dead vegetation in the southern margin of Qaidam Basin, by using relevant statistical methods. The results show that: (1) The correlation between the parameters of shadow dune is significant (P<0.01), in which the vertical and horizontal scales of dune have good correlation, and the fitting relationship between the length and width of dune (R2=0.6) is better than other parameters. (2) There is a significant positive correlation (0.8≥r>0.5, except dredge degree) between the parameters of dead H. arachnoideus and the shape of shadow dune. The contribution of vegetation length and width to the extension of dune length is gradually decreasing, while the contribution of vegetation height to it is increasing. (3) The canopy area, length and dredging degree of H. arachnoideus were significantly correlated with the volume of shadow dunes (P<0.01), and the fitting relationship between canopy area and volume was good (R2=0.8), which jointly affected the sand interception capacity of H. arachnoideus. (4) The main grain size fractions of the sediment are very fine sand and fine sand, Under the influence of plants, the wind force gradually decreases, and the grain size of sediment along the wind direction gradually becomes thicker.

Key words: shadow dunes, Halogeton arachnoideus, morphological character, grain size characteristics, Qaidam Basin

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