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在落实1983年林业生产措施中,落叶松育苗很重要,本文谈谈落叶松留苗密度对苗木质量的影响问题。据1982年育苗验收中调查,有些地方落叶松的留苗密度问题很大,少者一平方米留苗250—300株,多者高达600—1200株,这对苗木产量、质量和经济效益都有很大影响。留苗过密,虽然提高了产量,但明显地降低了质量,苗高和地径生长都达不到出圃的标准:过稀,当然可以保证苗木个体之间生长的营养面积,但又会造成不应有的减产,而且,苗床干旱,易失水板结,给杂草滋生创造了条件。过稀过密都会影响经济效果。实践证明:只有合理的留苗密度,才能提高苗木质量,保证造林成活率和苗圃的经济收入。在验收调查中看出,密度对苗木高生长量影响不
In the implementation of the measures of forestry production in 1983, larch seedling is very important, this article about the larch seedling density on the quality of seedlings. According to 1982 nursery acceptance survey, in some places the Larix seedling density problem is very large, the remaining one square meters of seedlings 250-300 strains, as many as 600-1200 strains, which nursery stock yield, quality and economic benefits are have a great impact. Excessive seedling retention, although increased yield, but significantly reduced the quality, height and diameter growth are not up to standard: out of thin, of course, can guarantee the growth of nursery stock nutrients between individuals, but will result in Should not be cut, but also, seedbed drought, water loss knot to create weeds breeding conditions. Excessive density will affect economic results. Practice has proved that: only a reasonable density of Llorent. In order to improve the quality of seedlings, afforestation survival rate and nursery to ensure economic income. In the acceptance survey found that the density of seedling height growth does not affect