［Objective］Studying the changes in the aboveground and underground functional traits of plants along small-scale natural gradients is helpful for understanding the trade-off patterns of resource utilization in the adaptation strategies of plants when they are faced with stressful environments.［Methods］We selected Reaumuria songarica shrubs on sandy lands with varying degrees of stabilization in the Ordos Plateau as our study subject. Using analytical methods such as analysis of variance and Pearson correlation analysis, we examined the functional traits and nutrient content characteristics of their leaves and roots.［Results］1. The plant leaves in mobile sandy lands exhibited lower succulence degree (2.08), lower leaf water content (51.68%), lower leaf saturated water content (57.47%), lower leaf carbon content (34.9 g/kg), and lower leaf nitrogen content (2.32 g/kg) compared with those in fixed sandy lands and semi-fixed sandy lands. The succulence degree (2.08), leaf water content (51.68%), leaf saturated water content (57.47%), leaf dry matter weight (425.34 mg/g), carbon content (34.9 g/kg), nitrogen content (2.32 g/kg), and carbon-nitrogen ratio (15.1) in mobile sandy lands were significantly different from those in fixed sandy lands and semi-fixed sandy lands (P<0.05); while the tissue density (0.07 cm3) and leaf specific area (74.13 cm2/g) showed significant differences compared with those in fixed sandy lands (P<0.05). 2. The root depth (78.4 cm) and the ratio of root horizontal extension to root depth (1.66) in mobile sandy lands were significantly higher than those in fixed sandy lands and semi-fixed sandy lands (P<0.05), and the root horizontal extension (129.83 cm) and nitrogen content (1.58 g/kg) were significantly different from those in fixed sandy lands (P<0.05). 3. By using the relative interaction intensity (RII), it could be seen that the scatter points in mobile sandy lands were farther away from the zero-value line, and the RII values of most indicators were significantly different from those in semi-fixed sandy lands. 4. There were significant correlations among most of the leaf functional trait parameters and the carbon, nitrogen, and phosphorus (CNP) contents in the leaves of Reaumuria songarica shrubs (P<0.05). There were also significant correlations among the root depth, root horizontal extension, the ratio of root horizontal extension to root depth, and the leaf functional trait parameters as well as the CNP contents in the leaves (P<0.05).［Conclusion］The above results proved the asynchrony of the adaptation strategies of the aboveground and underground plant functional traits of Reaumuria songarica shrubs, and explained how the shrubs adapted to stressful environments of different degrees by changing the resource allocation patterns of aboveground and underground organs.