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青钩栲(Castanopsis kawakamii Hay)是我国亚热带珍贵用材树种,实生苗造林成活率低,一般只有30％左右,造林初期生长缓慢,其主要原因是青钩栲苗木主根虽然发达,但侧根细少,加之春季造林先抽梢后生根,供给不足。所以抑制主根,促进侧根生长,增加须根、菌根,即增加苗根活力就成为提高苗木质量的关键。 抑制主根生长、促进侧根生长,在实践中普遍采用床上切断主根、苗木移植换床等方法;近来也有人把发芽种子切除胚根尖端后播种育苗。1978年以来我们对青钩栲育苗也采用了以上办法,但均未获得满意的结果。
Castanopsis kawakamii Hay is a subtropical timber species in our country. The survival rate of seedlings is low, usually only about 30%. The initial growth of Castanopsis kawakamii Hay is slow. The main reason for this is that although the main root of the seedlings is well developed, Coupled with the spring shoot first shoot after rooting, lack of supply. Therefore, the inhibition of the main root, promote lateral root growth, increase the fibrous roots, mycorrhizal, that is to increase the seedling root vitality has become the key to improve seedling quality. Inhibition of the growth of the main root and promote the growth of lateral roots, in practice commonly used in bed cut off the main root, seedling transplantation for bed and other methods; recently some people germinated seeds cutting radicle seedlings after sowing. Since 1978, we have also adopted the above method for raising young barnyardgrass seedlings, but none of the above results have been satisfactory.