在全球范围内，干旱、半干旱地区面积占陆地总面积的1/3，其中沙丘占20%左右。沙丘以其各种形态、规模和间距出现在全球不同沙漠或沙地，且具有一定排列组合规律，即沙丘格局。受控于区域风况、沙源及下垫面类型等，沙丘格局在各地显示不同的时空变化。本文以库布齐沙漠南缘为研究对象，基于研究区的多期遥感影像，利用沙丘格局分析法，提取沙丘脊线，量算和分析了沙丘脊线长度、间距、高度、缺陷密度、走向等沙丘格局参数，结合区域气候要素和土地利用变化变化，分析了沙丘格局时空变化及其影响因素，揭示沙丘格局发育、变形以及动态变化过程，所得结论如下：

（1）在库布齐沙漠南缘沙丘以新月形沙丘链为主，贯穿沙丘地的若干条季节性河流和道路阻止了沙丘顺风向的自组织演变，导致沙丘格局参数没有明显的变化趋势。在河流和道路分隔区，因顺风向长度限制和植被作用，沙丘格局也未出现明显的趋势性。

（2）近14年来，库布齐沙漠南缘沙丘格局具有明显的年际变化。沙丘长度和高度在趋于减小，沙丘间距和缺陷密度趋于增加，沙丘走向由NE-SW向NNE-SSW向转变，沙丘移动速率持续减小。在沙丘格局参数季节变化中，沙丘长度春末夏初达到最大值，之后持续减小。

（3）库布齐沙漠南缘沙丘格局时间变化与区域环境要素变化和人类活动密切相关。输沙方向的向南偏转使沙丘走向向北偏转；降水量增加导致的自然植被增加和人工植被增加以及风能减小，使沙丘移动速率减缓和缺陷密度增加，随之出现有植被沙丘数量增加，沙丘类型由新月形沙丘向抛物线形沙丘转形。

（4）库布齐沙漠南缘沙丘格局参数之间的关系中，初期沙丘间距与脊线长度和与沙丘高度具有良好的正相关，与缺陷密度之间呈现较好负相关。但随着时间的推移，这些相关度越来越差。暗示自然植被和人工植被在削弱沙丘自组织演变。

Sand dunes are mound-like or monopoly-like landforms formed by the accumulation of sand particles under the action of the wind. Globally, arid and semi-arid areas cover about 1/3 of the total land area, of which sand dunes account for about 20%. Sand dunes occur in various forms, sizes and spacing in different deserts or sandy areas around the world and have a certain pattern of arrangement and combination, known as the dune pattern. Depending on the regional wind conditions, sand sources and underlying surface features, the dune pattern shows different spatial and temporal variations in different places. This paper takes the southern edge of the Hobq Desert as the research area，based on the multi-period remote sensing images of the study area, the dune pattern analysis method is used to extract the dune ridges, measure and analyse the dune pattern parameters such as length, spacing, height, defect density and orientation of the dune ridges, as well as to analyse the spatial evolution and temporal changes of the dune pattern at the southern edge of the Hobq Desert and its influencing factors, taking into account the changes in land use and regional environmental factors. The conclusions are as follows.

(1) During the evolution of the dune pattern from west to east at the southern edge of the Hobq Desert, the presence of seasonal rivers and roads disrupts the dune self-organisation process, resulting in no obvious trend in dune pattern parameters. In the area separated by rivers and roads, the dune pattern also does not show a clear trend due to downwind length constraints.

(2) Over the past 15 years, the dune pattern at the southern edge of the Hobq Desert has shown significant interannual variation. In general, dune length and height tend to decrease, dune spacing and defect density tend to increase, dune orientation changes from NE-SW to NNE-SSW, and dune movement rate continues to decrease. Seasonal variations in dune pattern parameters show that dune length reaches a maximum in late spring and early summer and continues to decrease thereafter.

(3) Temporal changes in dune patterns on the southern edge of the Hobq Desert are closely related to changes in regional environmental factors and human activities. The shift in the direction of sand transport to the south has shifted the dunes to the north; the increase in natural and artificial vegetation due to increased precipitation and the decrease in wind energy has slowed the rate of dune movement and increased the density of defects, with a consequent increase in the number of vegetated dunes and a shift in dune type from crescent-shaped to parabolic dunes.

(4) In the relationships between dune pattern parameters at the southern edge of the Hobq Desert, the dune spacing at the beginning of the period has good positive correlations with ridge length and with dune height, and shows good negative correlations with defect density. However, over time these correlations become increasingly poor. It is implied that natural and artificial vegetation is weakening the self-organized evolution of the dunes.