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影响杉木壮苗培育的因素很多,在具备良种、圃地、施肥等基本条件下,其时空影响因素主要是播种时间、定苗时间和定苗株数。试验表明,上述三因素均对杉苗性状产生极显著影响,其中播种时间影响最大。其时空效应模式为12～1月播种(冬播),9月上旬最后定苗,每平方米定苗153株,杉木Ⅰ级苗产量最高,经济效益最好。而春播,特别是3月中旬播种效果最差。培育杉木Ⅰ级苗(Ⅰ级苗率大于30％,每公顷产苗60万株),通过定向培育措施可以实现。
Affect fir seedling cultivation many factors, with a good species, nursery, fertilization and other basic conditions, the main factors affecting their space-time sowing time, Dingmiao time and the number of Dingmiao. Experiments show that the above three factors have a very significant impact on the seedling characters, the sowing time of the greatest impact. Its space-time effect mode is sowing from January to January (winter sowing), and the last Dingmiao is in early September, with 153 plants per square meter of Dingmiao, the highest yield of Chinese fir Ⅰ seedlings and the best economic benefit. The spring sowing, especially in mid-March planting the worst. Cultivation of fir Ⅰ grade seedlings (Ⅰ grade seedling rate of more than 30%, 600,000 plants per hectare), through directional cultivation measures can be achieved.