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华北落叶松是我县主要的造林树种,以往采用全光、中午浇降温水的方法育苗,这种方法工作量大,费水。于是,我们从1983年开始进行中午不浇降温水试验,现已取得较好效果。一、试验地气候条件试验地位于东经117°59′,北纬42°08′,海拔1,100米的围场县旺水泉苗圃。土质为沙质壤土,水源充足,排灌方便。该地年平均气温3℃,最高温39℃,最低温-29℃,昼夜温差大;年降水量460毫米,无霜期110天。6月早上有时有霜冻。
Larix principis-rupprechtii is the main afforestation species in our county. In the past, seedlings were nurtured by using all-light and noon-pouring warm water. This method requires a lot of work and water. As a result, we started in 1983 at noon without pouring warm water test, has achieved good results. First, the climatic conditions of the experimental site are located at the Wangshuiquan nursery of Weichang County, 117 ° 59 ’east longitude, 42 ° 08’ north latitude and 1,100 meters above sea level. Soil is sandy loam, adequate water, irrigation and drainage convenience. The average annual temperature of 3 ℃, the highest temperature 39 ℃, the lowest temperature -29 ℃, large temperature difference between day and night; annual precipitation 460 mm, frost-free period of 110 days. There are frosts sometimes in the morning of June.