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苗木是造林的物质基础,培育优质苗木是提高造林质量的关键,一九六七年以来,我在落叶松育苗的长期实践中,体会到:留苗密度对苗木质量有极大影响。留苗过密,虽然可以增加产量,但苗木生长纤弱,发育不良,降低了质量;留苗过稀,虽然扩大了苗木生长的营养面积,但给杂草滋生造成条件,且浪费了土地,尤其是落叶松在幼苗期喜群生,苗木过稀,不仅能降低产量,提高成本,而且容易造成苗木的枯死。可见,合理留苗,对提高苗木质量,增加苗木产量,具有十分重要的意义。现将一九六七年在后腰苗圃落叶松育苗的不同留苗密度试验情况介绍如下:落叶松育苗不同留苗密度试验情况如表1。
Seedlings are the material basis for afforestation. Cultivating high-quality seedlings is the key to improving the quality of afforestation. Since 1967, in the long-term practice of larch nursery, I realized that the density of seedlings has a great impact on the quality of nursery stock. Excessive seedling retention, although can increase the yield, but the seedling growth is weak, poorly developed, reducing the quality of seedlings too thin, although the expansion of the nutritional growth of seedlings, but give birth to weeds breeds conditions and waste of land, especially Larch is hi congratulation in the seedling stage, too thin seedlings, not only can reduce production and increase costs, but also easily lead to seedlings dead. Visible, reasonable retention seedlings, to improve seedling quality, increase seedling yield, has very important significance. Now in 1967 in the nursery larch nursery seedling density test of different conditions are described below: Larix seedlings of different seedling density test situation in Table 1.