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研究包括两期造林试验。第一期种源试验种子采自中国全分布区的17个省(市)的37个县,在4个不同生态条件下布设造林点;第二期优良种源一家系联合试验种子采自7个优良种源采种县的79株优势木。在3个不同生态条件下布设造林点,3—7次重复,随机区组9—16株小区。研究结果表明:白榆种源的树高、胸径、主干高、冠幅、材积、干形等6个性状和种源×立地交互作用的方差分析差异极显著。其主要经济性状遗传变异呈单向渐变模式。用主分量分析方法将37个种源划分为4组,为陕西筛选出适合不同生态条件的优良种源。优良种源同省内华县种源比较,树高遗传增益为13%。
The study includes two afforestation experiments. The first seed germplasm was collected from 37 counties in 17 provinces (cities) in China’s total distribution area and afforestation sites were set up in 4 different ecological conditions. The second-stage provenance provenances were collected from 7 A good provenance seed counties 79 dominant trees. Afforestation sites were set up in 3 different ecological conditions, 3-7 replications and 9-16 random blocks. The results showed that there were significant differences in variance analysis between the elite source such as tree height, DBH, trunk height, crown width, volume, dryness and provenance × site interaction. The main economic traits of genetic variation showed a one-way gradient mode. The 37 provenances were divided into 4 groups by principal component analysis, and the best provenances for different ecological conditions were screened in Shaanxi Province. Compared with the provenances in Nei’an County of Inner Mongolia, the superior provenances have a genetic gain of 13%.