This study was conducted to select plus trees of two evergreen oaks, Quercus salicina and Q. glauca, in Korea. Evergreen oaks are distributed in subtropical region in Korea and have recently emerged as one of the alternative tree species against climate change. Accordingly, a tree breeding program is underway to foster evergreen oaks as a reforestation species for the future. Through intensive survey on the distribution range, 15 stands (8 for Q. salicina, 3 for Q. glauca, and 4 for both species) were selected as base populations. To select candidate trees, we developed a subjective grading system with six characteristics in three categories and introduced a weighted generalized value (GVI_w) to compare superiority of candidate trees. The candidate trees were screened using baseline value ‘0’, i.e., if GVI_w > 0, then accepted and if GVI_w < 0, then rejected. After then, adjustment was conducted to avoid biasing the selection of plus trees for a particular location. Through this process, 44 candidate trees in Q. salicina and 41 candidate trees in Q. glauca were selected as plus trees. Finally, the results and implications were discussed in relation to evergreen oak breeding in Korea.

中文翻译：

---

加上Quercus salicina Blume和Q. glauca Thunb的树木选择。及其在韩国常绿橡树育种中的意义

这项研究的目的是在韩国选择两棵常绿橡树栎栎和Q. glauca的正树。常绿橡树分布在韩国的亚热带地区，最近成为对抗气候变化的替代树种之一。因此，正在进行树木育种计划，以培育常绿橡树作为未来的重新造林树种。通过对分布范围密集的调查，15个支架（8为Q.蚧， 3为Q.青冈，和4这两个物种）被选定为基础群体。为了选择候选树，我们开发了具有三个类别的六个特征的主观评分系统，并引入了加权广义值（GVI _w）以比较候选树的优势。使用基线值“ 0”筛选候选树，即，如果GVI _w > 0，则接受；如果GVI _w <0，则拒绝。在那之后，进行调整以避免对特定位置的正树选择产生偏见。通过此过程，选择了Q. salicina中的44个候选树和Q. glauca中的41个候选树作为正树。最后，讨论了与韩国常绿橡木育种有关的结果和意义。