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榆林地区最近总结林木引种驯化工作,认为成果显著。据不完全统计,该区历年来,从省内外引进的用材、固沙、经济树种共300余种(其中杨树182种)。建国初期引进的洋槐、紫穗槐和1956年前后引进的油松、樟子松、花棒、糖械、白腊等已在该区安家落户,成为该区主要造林树种。引进的杨树品种,经过选育,大量推广用于生产的有合作杨、北京杨、群众杨、大关杨、胡杨、西加加、新疆杨等10多种。引进的核桃、巴
Yulin region recently concluded forest introduction and domestication, that the results were significant. According to incomplete statistics, over 300 years of species, sand-fixing and economic tree species introduced from inside and outside the country over the years have been introduced in this area (of which, 182 species of poplar trees). The introduction of acacia and Amorpha fruticosa and the introduction of Pinus tabulaeformis, Pinus sylvestris var. Mongolica, Hibiscus margarita, Brassica parapsilon, Palepa arborvitae etc. around 1956 have all settled in this area and become the main afforestation species in this area. The introduction of poplar varieties, after breeding, a large number of promotion for the production of cooperation Yang, Beijing Yang, poplar Yang, Poplar, Populus, Xiga Jia, Xinjiang Yang more than 10 kinds. The introduction of walnut, Pakistan