中文摘要：

以塔克拉玛干沙漠南缘沙漠—绿洲过渡带的优势植物种骆驼刺（Alhagi sparsifolia Shap.）为研究对象,设置当年春季砍伐、春季火烧,上一年秋季砍伐和对照处理,研究刈割和火烧对骆驼刺不同器官N、P、K化学计量特征的影响。结果表明：不同干扰处理下骆驼刺不同器官N、P、K含量及其N∶P比差异显著,并且在不同生长阶段变化规律不一致,其平均N、P、K含量以及N∶P比均为叶片高于茎和刺。在骆驼刺的生长阶段（8—10月）,叶和刺中均为P含量及N∶P比的季节变异较小,N及K含量的季节变异较大;茎中N及K含量的季节变异较小,P含量及N∶P比的季节变异较大。对骆驼刺N、P、K含量及其N∶P比的多因素方差分析显示,骆驼刺N和P主要受不同器官的影响,而K和N∶P比主要受生长阶段的影响。

英文摘要：

In this study,the dominant plant species,Alhagi sparsifolia Shap. in southern marginal zone of the Taklimakan Desert,was taken as the subject to research the effects of different disturbance treatments（ cutting and burning in spring,cutting in last fall and contrast test） on the stoichiometry characteristics of different organs of A. sparsifolia. The results showed that the N,P and K concentrations and N∶ P ratio in different organs of A. sparsifolia were significantly different under different disturbance treatments. The variation was different at different growth stages,and the concentrations of N,K and P and N∶ P ratio in leaves were higher than those in stems and assimilative branches. In growing season from August to October,the seasonal variation of P concentration and N∶ P ratio in leaves and assimilative branches of A. sparsifolia was not significant,but that of N and K concentrations was obvious. While the seasonal variation of N and K concentrations in stems was not significant,but that of P concentration and N∶ P ratio was obvious. The multi-factor analysis of variance revealed that the N and P concentrations depended mainly on plant organs,and the K concentration and N∶ P mass ratio changed with the growth stages.