2、了做好林木良种产业产学研相结合，进行区域试验，有序开展引种驯化，制定标准技术规程，提高全区主要造林树种林木良种使用率的方法和对策。关键词：造林绿化；林木良种；使用率；途径Approaches to Upgrading the Extension ofImproved Afforestation Germplasm in NingxiaChen Weining，LiYingwu，NiuJinfeng，LiuYing，JiLiping(Ningxia Management Center for State-own Forest Farms and Fore
3、st Seeds and Seedlings, Yinchuan, Ningxia 750001 PRC)10Abstract: By the end of 2015, the improved germplasm resources officially registered in Ningxia included 12 provenances, 3 F1 seed orchards, 3 mother tree forests, 11 clones and 37 varieties. They encapsulated the main speci
4、es for the afforestation in the southern mountainous areas, central desertification areas and northern plains of Ningxia. Improved varieties are at the leading position for fruit production and are popularly employed in urban beautification and landscaping. However, there are st
5、ill some problems in the development of germplasm resources such as the structural conflicts in seed-seedling sectoral progress and the low extension rate of improved seeds and seedlings. On the basis of field investigations and analysis, approaches to upgrading the extension of
6、 improved afforestation germplasm in Ningxia are proposed such as the combinations among production, education and research, the network of regional tests, the introduction and domestication of improved germplasm and the formulation of technical standards and specifications. Key
7、 words: afforestation and greening, improved forest seeds and seedlings, extension rate, approach为夯实我区林木良种发展基础，推进林木良种产业可持续发展，科学谋划“十三五”林木良种发展，进一步推进林木良种化进程，提高主要造林树种林木良种使用率。笔者对全区主要造林树种林木良种使用情况进行了统计分析，初步探索了提高我区林木良种使用率的方法和途径。1统计分类和范围1.1统计树种按照经济林、速生丰产林（商品林）、生态林、其他四类统计全区“十二五”期间主要造林树种总造
