为深入探讨西鄂尔多斯地区荒漠植物对干旱环境的适应机制，明确不同荒漠植物的功能性状及CSR生态策略（C、S、R分别代表竞争策略、耐胁迫策略和杂草策略）差异，以沙冬青〔Ammopiptanthus mongolicus (Maxim. ex Kom.) S. H. Cheng〕、霸王〔Zygophyllum xanthoxylon (Bunge) Maxim.〕和四合木（Tetraena mongolica Maxim.）为研究对象，对其形态和结构性状及叶的光合生理指标和化学计量指标差异进行比较分析，对22个植物功能性状进行主成分分析和Pearson相关性分析，并对3种荒漠植物的功能性状网络和CSR生态策略差异进行分析。结果显示：沙冬青的株高、冠幅、基径、叶干质量、叶干物质含量、叶面积、比叶面积及叶的碳含量、氮含量、C/N比（碳含量与氮含量的比值）、C/P比（碳含量与磷含量的比值）、N/P比（氮含量与磷含量的比值）显著（p<0.05）高于另2种植物，而其叶的净光合速率、水分利用效率、气孔导度和磷含量却显著低于另2种植物。主成分分析结果显示：前2个主成分的累计贡献率为82.06%，其中，第1主成分主要反映光合生理特性，第2主成分主要反映形态和结构性状及化学计量特征。总体来看，3种植物的形态和结构性状及光合生理指标与化学计量指标间的相关性大多不显著，而形态和结构性状与光合生理指标间的相关性大多显著、极显著（p<0.01）或极其显著（p<0.001）。沙冬青的功能性状网络含7个模块，而霸王和四合木的功能性状网络均含3个模块；沙冬青的边密度和平均聚类系数最低、模块度最高，霸王和四合木的3个参数相近。沙冬青、霸王和四合木的CSR生态策略分别为SR/CSR型、S/SR型、S型。综上所述，3种荒漠植物的功能性状和生态策略差异明显。沙冬青通过提高叶片干物质含量和降低蒸腾作用，增强资源保存和耐受能力，生态策略倾向于竞争和耐胁迫策略；霸王和四合木则通过提高光合速率和磷吸收能力，实现快速生长和资源获取，其中，霸王倾向于杂草和耐胁迫策略，四合木倾向于耐胁迫策略。

To further explore the adaptation mechanisms of desert plants to arid environments in the Western Ordos region of China, and identify the differences in functional traits and CSR ecological strategies (C, S, R represent competitive strategy, stress tolerance strategy, and ruderal strategy, respectively) among different desert plants, taking Ammopiptanthus mongolicus (Maxim. ex Kom.) S. H. Cheng, Zygophyllum xanthoxylon (Bunge) Maxim., and Tetraena mongolica Maxim. as research objects, a comparative analysis was conducted on the differences in their morphological and structural traits and leaf photosynthetic physiological indexes and chemical stoichiometric indexes, principal component analysis and Pearson correlation analysis were performed on 22 plants functional traits, and the differences in plant trait networks and CSR ecological strategies were analyzed among the three desert plants. The results show that A. mongolicus exhibits significantly (p<0.05) higher values in height, crown width, basal diameter, leaf dry mass, leaf dry matter content, leaf area, specific leaf area, and carbon content, nitrogen content, C/N ratio (ratio of carbon content to nitrogen content), C/P ratio (ratio of carbon content to phosphorus content) and N/P ratio (ratio of nitrogen content to phosphorus content) in leaves than those of the other two plants, while its leaf net photosynthetic rate, water use efficiency, stomatal conductance, and phosphorus content are significantly lower than those of the other two plants. The results of the principal component analysis show that the cumulative contribution rate of the first two principal components is 82.06%, in which, the first principal component mainly reflects photosynthetic physiological traits, while the second principal component mainly reflects morphological and structural traits as well as stoichiometric characteristics. Overall, the correlations of the morphological and structural traits and photosynthetic physiological indexes with stoichiometric indexes of the three plants are mostly nonsignificant, while the correlations between the morphological and structural traits and  photosynthetic physiological indexes are generally significant, extremely significant (p<0.01), or greatly extremely significant (p<0.001). The plant trait network of A. mongolicus consists of seven  modules, whereas those of both Z. xanthoxylon and T. mongolica consist of  three modules. A. mongolicus exhibits the lowest edge density and average clustering coefficient, along with the highest modularity, while the three parameters of Z. xanthoxylon and T. mongolica are similar. The CSR ecological strategies of A. mongolicus, Z. xanthoxylon, and T. mongolica are classified as SR/CSR, S/SR, and S types, respectively. In summary, there are significant differences in the functional traits and ecological strategies among the three desert plants. A. mongolicus enhances resource conservation and tolerance by increasing leaf dry matter content and reducing transpiration, its ecological strategy tends towards competitive and stress tolerance strategies; while Z. xanthoxylon and T. mongolica achieve rapid growth and resource acquisition by enhancing their photosynthetic rate and phosphorus absorption capacity, among them, Z. xanthoxylon tends toward ruderal and stress tolerance strategies, T. mongolica tends toward a stress tolerance strategy.