极端干旱区多枝柽柳叶片功能性状及其与土壤理化因子的关系

叶片是植物获取资源的重要器官，研究其功能性状与环境因子的关系，有助于更好地了解植物对环境要素变化的生态适应性。以塔里木盆地北缘不同生境下(绿洲、过渡带、荒漠)典型荒漠植物多枝柽柳(Tamarix ramosissima)为研究对象，分析其叶片结构和生理性状在不同生境间的差异，建立叶片性状与土壤理化因子的相关关系，解析荒漠植物的生态适应性并揭示影响荒漠植物叶片功能性状的关键环境因子。结果表明：(1)多枝柽柳叶片功能性状具有不同程度的变异，其中叶片面积变异幅度最大(40%),比叶面积、可溶性蛋白含量等变异幅度最小(均为15%)。(2)多枝柽柳叶片厚度和叶片面积等结构性状以及叶片可溶性蛋白、脯氨酸、淀粉含量等生理性状在不同生境中均具有显著差异(P<0.05),其中可溶性蛋白、脯氨酸含量均在荒漠生境中达到最高。(3)多枝柽柳叶片部分功能性状之间存在显著的相关关系，其中叶片厚度、淀粉含量等与叶组织密度呈显著负相关关系(P<0.05),而叶片厚度与淀粉含量之间、可溶性糖含量与非结构性碳水化合物含量之间均呈极显著正相关关系(P<0.01)。(4)通过RDA排序分析发现，土壤速效磷含...

Leaf functional traits of Tamarix ramosissima in extremely arid region and their relationship with soil physicochemical factors

Leaf is an important organ for plants to obtain resources. Studying the relationships between its functional traits and environmental factors helps to better understand the ecological adaptability of plants to environmental changes. In this study, with the aim of determining the ecological adaptations of desert plants and revealing the environmental factors that influencing the functional traits of them, we investigated a typical desert plant, Tamarix ramosissima, in different habitats (oasis, transition zone and desert) at the northern edge of the Tarim Basin, analyzed the differences in its leaf structure and physiological traits, and established the correlation between them with soil physicochemical factors. The results showed that: (1) the functional traits of Tamarix ramosissima leaves exhibited different degrees of variation, with the greatest variation in leaf area (40%) and the least variation in specific leaf area and soluble protein content (both 15%). (2) The structural traits including leaf thickness and leaf area, as well as physiological traits including leaf soluble protein, proline, and starch contents of Tamarix ramosissima were significantly different among the three habitats (P<0.05), with soluble protein and proline contents reaching the highest levels in desert habitats. (3) There were significant correlations between several functional traits of Tamarix ramosissima leaves. Leaf thickness and starch content were significantly negatively correlated with leaf tissue density (P<0.05), while the correlations between leaf thickness and starch content, soluble sugar content and non-structural carbohydrate content were significantly positive (P<0.01). (4) The RDA analysis revealed that soil environmental factors including soil available phosphorus content, soil water content, pH and bulk density had the greatest influence, and could explain the leaf functional trait variations of Tamarix ramosissima better. This study indicates that Tamarix ramosissima adapts to extreme arid environment by developing ecological responses that varying in leaf functional traits and forming synergistic trade-offs between them. Soil available phosphorus content and soil water content are the most critical soil environmental factors affecting leaf functional traits of Tamarix ramosissima. The findings of this study provide a theoretical basis for the scientific management, conservation, and restoration of desert vegetation in extreme arid region.