中文摘要：

分析水分与养分添加对植物功能性状的影响，对揭示植物对环境变化的响应和适应规律至关重要。该文通过施氮与增水（包括增雨、增雪）共6种处理（对照（N0W0）、雨添加（N0W1）、雪添加（N0W2）、氮添加（N1W0）、氮雨添加（N1W1）、氮雪添加（N1W2）），对荒漠草地进行氮肥添加、水分添加的实验。实验持续了3年，第4年以荒漠草地建群种植物钠猪毛菜（Salsolani—traria）植物功能性状为研究对象，量化分析了钠猪毛菜10种植物功能性状对氮素和水分添加的不同响应。得出以下结论：（1）双因素方差分析结果表明，施氮、增水的交互作用对钠猪毛菜的茎鲜质量、叶鲜质量、叶面积、比叶面积、叶饱和含水量、叶干物质含量存在显著影响（p〈0．05），而施氮主效应对钠猪毛菜各植物功能性状指标不存在显著影响、增水主效应对钠猪毛菜各植物功能性状指标不存在显著影响。（2）在钠猪毛菜10种植物功能性状指标中，株高、茎鲜质量、茎干质量、叶饱和鲜质量、叶干质量、叶面积、比叶面积的最大值均出现于N1W2处理中（p〈0．05），其次为N0W0处理。叶饱和含水量的最大值出现于N1W0中，其次为N1W2处理中。N1W0处理显著降低了叶饱和含水量加〈0．05）；叶干物质含量值在各处理下均高于N0W0，其中NOW．处理的叶干物质含量显著高于N0W0（p〈0．05）。（3）各处理下，叶干物质含量与比叶面积为负相关关系。在准噶尔荒漠草地，钠猪毛菜植物功能性状在不同处理下的不同表现是适应环境变化的结果。

英文摘要：

Aims Our objective was to better understand the response of plant functional traits of Salsola nitraria to environmental change, such as global climate change and nutrient addition, in desert grassland. Methods We conducted field experiments of moisture and nutrient additions for three years （2009-2011） in a desert grassland of northwest Xinjiang in China. We investigated plant functional traits of S. nitraria and in the fourth year （2012） measured plant height, stem fresh mass, stem dry mass, leaf fresh mass, leaf dry mass, etc. un- der different treatments of nutrient and water additions. Important findings The combination of fertilizer and moisture had a significant influence on stem fresh mass, leaf fresh mass, leaf area, specific leaf area, leaf saturated water content, and leaf dry matter content （two-way ANOVA, p 〈 0.05）, while the effect of either fertilizer or moisture alone was not significant. None of the treat- ment effects on plant height were significant. The maximum values of plant height, stem fresh weight, stem dry weight, leaf saturated fresh weight, leaf dry weight, leaf area, and specific leaf area appeared in the snow and fer- tilizer additions （NIW2）, and the second highest was in the control （N0W0）. Maximum leaf saturated water content was observed in the control （N0W0）, and the second highest appeared in the snow and fertilizer additions （N1W2）. The fertilizer addition （N1W0） could significantly decrease the level of leaf saturated water content. In all of the treatments, leaf dry matter content was higher than that under the control, and among them, the rain addition （N0W2） significantly increased leaf dry matter content. In the control, there were many significant negative corre- lations between leaf dry matter content and other functional traits and many significant positive correlations be-tween different functional traits. After the fertilizer and/or moisture addition, the correlation coefficient was re- duced. In desert grassland of the Junggar B