近年来，山西省吉县在林业建设方面，先后实施了退耕还林工程、天然林保护工程、三北防护林四期工程等三大生态建设工程，生态建设工程的大规模发展，给种苗生产既带来了艰巨的任务，又带来了规模稳定的市场需求。２００２年５月，通过对吉县合同育苗重点区———屯里镇五个村? In recent years, Jixian County, Shanxi Province, has implemented the large-scale development of three major ecological construction projects and ecological construction projects such as the project of returning farmland to forestry, natural forest protection and Phase III of the Three-North Shelter Belt in forestry construction, Not only brought a daunting task, but also brought a stable market demand. May 2002, through the Jixian contract nursery focus area --- Tunli five villages?