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一、试验目的白榆的种源试验在世界各国已受到普遍重视,我国的试验在中林所主持下,正在深入开展。正确地选择种源可提高材积生产力的20～30%或更多。我区营造榆树从外地引入大量种籽,但由于产地不清,种籽混杂,生长差异很大。为更好地挖掘和发挥白榆的生产潜力,提高产量,为我区半干旱、干旱地区培选出最适宜的榆树良种种源采区。我们于1980年参加了全国白榆种源研究协作课题,在我院如意和试验林场进行了白榆不同种源育苗试验,并取得了一定成绩。
First, the purpose of the experiment Elm elm provenance test in all countries in the world have received widespread attention, our test under the auspices of Nakabayashi, is being carried out in-depth. Proper selection of provenances can increase productivity by 20-30% or more. My area to create elm introduced a large number of seeds from the field, but due to unclear origin, mixed seeds, growth varies widely. In order to better tap the potential of elm production and increase production, we selected the most suitable elm variety seed mining areas for semi-arid and arid areas in our district. We participated in the national white elm provenance research collaboration in 1980, in our hospital wishful and experimental forest farms elm seedling breeding test of different provenances, and achieved some success.