华北落叶松(Larix Principis-rupprechtiiMayr)以生长快、材质好、经济价值高著称,是华北山地造林的重要优良树种。但在育苗技术上尚存在不少问题有待解决,其中播种量大是重要问题之一。众所周知,华北落叶松种子短缺,价格昂贵,播种量大,既不经济,也影响苗木质量。为提高经济效益,寻求适宜的播种量,我们于1983年在山西省雁北地区灵邱县苗 Larix Principis-rupprechtiiMayr is famous for its fast growth, good material quality and high economic value. It is an important fine tree species afforestation in north China. However, there are still many problems to be solved in the technology of seedling raising. Among them, the large amount of seeding is one of the important issues. As we all know, Larix principis-rupprechtii seeds in short supply, expensive, seeding large, neither economical, but also affect the quality of nursery stock. In order to improve economic efficiency and seek appropriate planting, we in 1983 in Shanxi Province Yan Qiu Xian Miao