中文摘要：

通过研究艾比湖地区9种盐生植物群落土壤剖面的氮素特征，揭示其影响因子。结果表明：① 干旱区荒漠中盐生植物的土壤理化性质差异显著（P＜0.05）。在整体上土壤氮素含量随土壤深度增加呈减小趋势，有效氮素形态为硝态氮。② 土壤氮素与土壤理化性质的相关性：全氮和碱解氮与有机质呈极显著正相关（P＜0.01）；碱解氮和全氮与pH、硝态氮和无机氮与电导率相关性不显著。③ 土壤中硝态氮的主要影响因素为铵态氮、碱解氮、全氮和有机质，其次是容重和含水量，最后是土壤pH和电导率，其他因素是通过影响土壤有机质的积累和分解对其起作用。

英文摘要：

Located in Xinjiang Uygur Autonomous Region in northwest China, the Ebinur Lake area plays a sig- nificant role for regional ecosystem. Study on soil nitrogen under 9 halophytes in this arid habitat could provide the basic data for soil improvement. A preliminary, study on soil nitrogen content under the 9 halophytes was carried out. The results revealed that, in vertical profile, soil nitrogen content was holistically decreased with the increase of soil depth, soil nitrate nitrogen was the main form of available nitrogen in the study area. Soil nitrogen content was related to soil physicochemical properties, and there was a significant correlation （ P 〈 0.01 ） among the con- tent of total nitrogen, alkali-hydrolyzable nitrogen and organic matter in soil. The correlations among the contents of soil alkali-hydrolysable nitrogen, total nitrogen, pH value, nitrate nitrogen, inorganic nitrogen and electrical con- ductivity were not significant. The stepwise regression analysis revealed that the content of soil nitrate nitrogen was mainly affected by the contents of ammonium nitrogen, alkali-hydrolysable nitrogen, total nitrogen and soil organic matter, then by soil bulk density and soil moisture content, and finally by pH value and electrical conductivity. The content of soil nitrate nitrogen was affected by other factors through the accumulation and decomposition of soil organic matter.