中文摘要：

采用盆栽试验,研究了不同水氮处理下骆驼刺（Alhagi sparsifolia）的形态特征、生物量累积和分配特征,并探讨了适合骆驼刺生长的最佳水氮条件。经过2年的水氮处理发现,水分和氮素处理对骆驼刺的株高、冠幅、基茎、地上和地下生物量累积均有显著影响,对生物量分配还存在着明显的交互作用,但在不同生长年份影响也不同。在第1个生长年份,综合评价结果为干旱低氮（田间持水量30%-35%,施氮51mg N·kg-1）处理下生长表现最好,主要表现在株高、基茎、根系生物量和根冠比均有明显增加。在第2个生长年份,则为中水中氮处理（田间持水量60%-65%,施氮102mg N·kg-1）下综合生长表现最好,主要表现在地上、地下生物量和根冠比均有显著增加。因此,在骆驼刺幼苗生长早期应推荐干旱低氮处理,随株龄增加则为中水中氮处理更合适。

英文摘要：

The potting experiment was conducted to study the changes of morphological characteristics, biomass accumulation and allocation of 1- and 2-year-old Alhagi sparsifolia under different water and nitrogen （N） treatments, and to further find out the suitable combination of water and N for the plant growth. The results showed that plant height, canopy, base diameter, shoot and root biomass were significantly af- fected by water and N supply. The combination of water and N had a significant influence on the biomass allocation of different organs for both growth stages, but the effects differed with growth age. For 1-yearold A. sparsifolia, the highest comprehensive evaluation value of plant growth was found under drought （30%-35% field water capacity （FC）） and low N （51 mg N · kg-1） treatment, under which there were significantly higher plant height, base diameter, root biomass and root： shoot ratio compared to the control treatment （drought and no N）. For 2-year-old A. sparsifolia, shoot and root biomass and root： shoot ratio were highest under middle water and N treatment （60%-65% FC and 102 mg N · kg-1） compared to other treatments. Correspondingly, the highest comprehensive evaluation value of plant growth was found under this treatment. This suggests that drought and low N treatment was suitable for A. sparsifolia seedlings in the first year, but middle water and N treatment became more appropriate in the second year.