论文部分内容阅读
育苗是为造林服务的。就以杨树来讲,有播种和扦插之分。哪一种方法培育的苗木造林好?从树木生物学特性研究,实生苗比扦插苗好。因为实生苗是有性繁殖,能提高生活力,克服长期无性繁殖给林木带来早衰和易染病害等问题。但从六十年代后期以来,卓资县播种育苗基本没有了,代之以大量的扦插育苗。卓资县过去造林以杨树、榆树为主,当时县里的三处国营苗圃每年搞小叶杨播种育苗一、二十亩,对植树造林起到促进作用。1964年以后,国营苗圃落叶松育苗逐年增加,杨树育苗除扦插几十亩
Nursery is afforestation services. As far as poplars are concerned, there are points for planting and cutting. Which method to nurture the seedlings afforestation? From the biological characteristics of trees, seedlings better than cutting seedlings. Because the seedlings are sexual reproduction, can improve the viability, to overcome the long-term clonal propagation to the forest to bring about premature aging and easily infected diseases and other issues. However, since the late 1960s, Zhuozi County seeding seedlings basically gone, replaced by a large number of cutting seedlings. In the past, Zhuozi County mainly used poplar and elm trees. At the time, three state-owned nurseries in the county engaged in poplar and seedling cultivation of one to twenty mu per year, which played a role in promoting afforestation. After 1964, nursery larch nursery state-owned nursery increased year by year, except for poplar nursery cuttings dozens of acres