中文摘要：

根据野外实地调查,采集植物标本鉴定,借鉴文献资料,对新疆野核桃自然保护区植物进行了植物区系和地理成分分析。研究表明：自然保护区内共有植物56科182属329种,其中蕨类植物6科7属17种,裸子植物3科4属9种,被子植物47科171属303种。平均种密度27.88种·km-2。菊科、蔷薇科、禾本科等14科为优势科,毛茛科、豆科、紫草科等8科为表征科;优势属和表征属分别为17属和5属。保护区植物不存在真正意义上的单种科,但有6个单种属。中国特有属1属（鸦葱属）,中国特有种14种,其中新疆特有种9种。在地理成分中温带分布型有14科140属299种,分别占（不含广布型）科、属、种总数的60.87%、94.59%和96.78%;保护区植物与中亚、地中海交流较多,与热带和东亚交流较少,具有强烈的温带性质。

英文摘要：

Using the field investigations and further plant specimen identification combined with the previous references, the flora and geographical compositions were studied in the natural con- servation area of Juglans cathayensis, Xinjiang. The results showed that there were 329 plant spe- cies, belonging to 182 genera and 56 families. Among them, ferns included 17 species, 7 genera and 6 families, and gymnosperms included 9 species, 4 genera and 3 families, while angiosperms included 303 species, 171 genera and 47 families. The average density of species was 27.88 spe- cies per km2. There were 14 dominant families, such as Compositae, Rosaceae, Gramineae, and 8 typical families, such as Ranunculaceae, Lequminosae, Boraginaceae. There were 17 dominant genera and 5 typical genera. There was no a single-species family in a real sense, but there were 6 monotypic genera in this area. One genus and 14 species were endemic to China and 9 species were endemic to Xinjiang. The geographical composition mainly belonged to temperate type with 299 areal-types of species, belonging to 140 genera and 14 families, which （not including the widely distributed type） accounted for 60.87%, 94.59% and 96.78% of all the families, genera and species, respectively. Plants in this reserve have obvious temperate nature, which have close affinity with Central Asia and Mediterranean, but not too much with tropic and East Asia.