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日本落叶松是辽宁东部山区的主要造林树种之一。它具有生长速度快和抗早期落叶病的优点。但是,这个树种在该地区,幼苗常常因为贪青而遭受秋霜冻害,致使枯梢或死亡。虽然翌年受害较轻的苗木基部侧芽能够继续生长,但对生长有一定的影响。这是一个生产中长期存在,迄今还没有解决的问题。对此,作者于1975年先后在抚顺地区两个苗圃进行了光周期试验,即用人工缩短光照时间的方法使苗木及时停止生长,并且安全越冬。一、试验材料、方法与结果试验1是在抚顺县五龙林场苗圃进行的。
Japanese larch is one of the main afforestation species in the eastern mountainous area of Liaoning. It has the advantages of fast growth and resistance to early deciduous diseases. However, the tree is in the area and seedlings are often subjected to autumn frost damage due to greyish greens, causing blight or death. Although the lateral shoots of the seedlings harvested at the end of the following year can continue to grow, they have a certain impact on the growth. This is a problem that has long been existent in production and has so far not been solved. In this regard, the author conducted photoperiod tests in two nurseries of Fushun Prefecture in 1975 successively, that is, the artificial seedlings were stopped growing in time and the wintering was safe by artificially shortening the light time. First, the test materials, methods and results of the test 1 is in Wulong Forest Farm in Fushun County.