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杉木是我国特产的一种速生优质高产用材树种,也是我省秦岭、巴山地区用材林的主要栽培树种之一。为了加速用材林基地建设步伐,汉中地区从1975年起,即开展了培育杉木壮苗的生产和试验研究工作。并确定了汉中地区杉木壮苗的标准是:生长健壮,干直茎粗,顶芽饱满,根系发达,高径比例适当,木质化程度较高。要求1年生杉木壮苗,亩产量为10～15万株,苗高达20厘米,地径达0.3厘米以上;2年生杉木壮苗,亩产量为6～10万株,苗高达50厘米以上,地
Cunninghamia lanceolata is a kind of quick-growing, high-quality and high-quality timber species that is special in our country. It is also one of the main cultivated species of timber forests in Qinling and Bashan areas in our province. In order to speed up the pace of construction of Timber Forest Base, starting from 1975, Hanzhong has carried out the production and experimental research on fir seedling cultivation. The criteria for strong seedling of Chinese fir in Hanzhong area are as follows: strong growth, thick stem, thick top bud, well-developed roots, proper proportion of height diameter, and high degree of lignification. Requires 1 year fir strong seedlings, per mu yield of 10 to 150,000, seedling up to 20 cm, diameter of 0.3 cm or more; 2 year fir strong seedlings, mu yield of 6 to 10 million, up to 50 cm above the seedlings