1980年至1983年,涞源县在北部上庄等7个乡(社)共育过华北落叶松苗250亩。由于种子较小,幼苗嫩弱,极易遭受恶劣环境影响,又未注意采取必要的技术措施,几年来既浪费了种子和劳力,又挫伤了群众育苗积极性。尤其是1983年所育的60亩,1984年检查大部死亡,仅保存10余亩且幼苗弱小、生长不良。1984年分析了失败原因,采取了四项技术措施,育华北落叶松苗140亩,亩 From 1980 to 1983, Laiyuan County had nurtured 250 mu of Larix principis-rupprechtii in a total of 7 townships in Shangzhuang in the north. Due to the small seeds and tender young seedlings, they are vulnerable to the harsh environment and have not paid any attention to the necessary technical measures. In the past few years, they have not only lost seeds and labor, but also dampened the enthusiasm of the public. In particular, 60 acres were raised in 1983, most of them were inspected in 1984 and only 10 acres were preserved and the seedling was weak and poorly grown. Analysis of the reasons for the failure in 1984, took four technical measures to cultivate 140 acres of Larix principis-rupprechia, acres