The aim of this study is to analyze the contents of nutrients ( N, P, K) in root, stem and leaf of deciduous trees in northern slope of Tianshan Mountains, Xinjiang. The contents of N, P and K in root, stem and leaf of 14 species of deciduous trees in Changji Forestry Bureau Nursery were determined during June-August 2010. Significant differences in nutrient contents in root, stem and leaf were observed between different tree species {p<0.05) , and those were also found between different organs of the same tree species. N and K contents exhibit significant linear relationships between root, stem and leaf (p<0.05) except for P content (p>0.05). The average N content in leaves of the 14 deciduous tree species in northern slope of Tianshan Mountains is higher than the average level of land plants at home and abroad, while the P content is higher than the average level in China and is close to the average level of land plants in the world.%为研究天山北部地区主要阔叶树种根、茎、叶器官的N、P、K养分质量分数特点及其相互关系,于2011年6-8月在新疆昌吉州苗圃,对14种天山北坡主要阔叶树种根、茎、叶的N、P、K养分质量分数进行测定.结果证明:不同树种根、茎、叶器官的N、P、K养分质量分数差异显著,同一树种不同器官的N、P、K养分质量分数差异显著；器官根、茎、叶之间的N质量分数呈显著线性相关,K质量分数呈显著线性相关,而P质量分数互相之间线性相关不显著；天山北坡主要阔叶树种的叶片N质量分数均高于国内外陆地植物叶片平均N质量分数水平,P质量分数高于国内陆地植物叶片平均P质量分数水平,接近全球陆地植物叶片平均P质量分数水平.
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