中文摘要：

【目的】探明荒漠盐生植物冠下土与叶片生态化学计量特征沿盐分梯度的变异及影响叶片元素计量特征的主要土壤因子,为干旱盐渍化区域生态保育提供理论依据。【方法】以新疆艾比湖流域2种典型荒漠盐生植物骆驼刺和白刺为研究对象,按照盐分梯度对2种植物分别选取3个10 m×10 m样方,基于216个冠下土和植物样品,综合分析不同盐分梯度下骆驼刺（轻度、中度和重度）和白刺（中度和重度）冠下土与叶片碳（C）、氮（N）、磷（P）化学计量特征,并利用冗余分析探究影响盐生植物叶片生态化学计量的主要土壤因子。【结果】盐分适度增加能明显提升荒漠盐生植物冠下土C、N、P含量,但高盐降低骆驼刺冠下土C、N、P含量;骆驼刺冠下土C∶N与C∶P以中盐样方最大,而白刺冠下土C∶N、C∶P、N∶P中盐与高盐样方之间均无显著差异（P〉0.05）。白刺叶片C、N、P含量随盐分提高而显著增加（P〈0.05）,C∶N与C∶P表现为中盐〉高盐;低盐增加骆驼刺叶片C和P含量,降低N含量,中盐导致骆驼刺叶片C∶N与C∶P升高。2种荒漠盐生植物叶片N∶P在不同盐分梯度下均无显著差异（P〉0.05）,均值分别为15.41±2.16、8.10±0.83。冗余分析表明,冠下土P含量和盐碱度分别是影响骆驼刺和白刺叶片C、N、P化学计量特征的主要因素。【结论】土壤盐分适度增加能提升荒漠盐生植物冠下土C、N、P含量,改变植物叶片的C、N、P含量及C∶P。盐生植物叶片生态化学计量受土壤盐碱度和元素含量的双重影响。

英文摘要：

[ Objective ] This study aimed to investigate the variation of stoichiometry in soil under crown and in leaves of desert halophytes along soil salinity gradients, and the major soil factors that affect leaf stoichiometry of desert halophytes, which is of great significance to ecological conservation in drought and salinization zone. [ Method ] This study was conducted at the Ebinur Lake Wetland National Nature Reserve in Xinjiang Uygur Autonomous Region of China. Three plots with 10 m × 10 m for each desert halophyte （Alhagi sparsifolia and Nitraria tangutorum） were set along soil salinity gradients. Based on the 216 samples of soil under crown and plant, the concentration of carbon （C）, nitrogen （N） and phosphorus （P） and the ratios of C： N, C： P, and N： P in soil under crown and leaves of two desert halophytes in different soil salinity gradients were studied. Besides, the main soil properties that affect the leaf stoichiometry of the two halophytes were determined with redundancy analysis. [ Result] The results showed that a modest increase in the soil salinity obviously improved C, N and P concentration in soil under crown of desert halophytes, while heavy salinity reduced C, N and P concentration in soil under crown of A. sparsifolia. The C： N, and C： P in soil under the crown of A. sparsifolia in medium salinity were the highest, while the largest values of N： P of A. sparsifolia and C： N, C： P, N： P of N. tangutorum appeared in light salinity plot, and, without striking difference with soil salinity gradient （P 〉 0.05）. The concentration of C, N and P in leaves of N. tangutorum increased significantly with the increase of soil salinity （P 〈0.05）. The C： N, and C： P ratios under medium salinity treatment were greater than that under heavy salinity treatment. Light salinity increased the content of C and P in leaves of A. sparsifolia, but reduced N content. Medium salinity caused increases in C： N, and C： P in A. sparsifolia leaves. The leaf N： P of th