选用良种造林,是实现杉木速生、丰产的途径之一。国内外实践证明,在相同的土壤和栽培措施下,选用良种造林,一般可以提高木材产量30％左右。目前世界上许多国家树种的改良工作,都是经过选优,建立无性或有性种子园,利用种子园的种子进行育苗造林。这种利用优树后代(种子)所培育成的森林,虽然较一般的林分好,但仍然会 Selection of afforestation, is to achieve fast-growing Chinese fir, one of the ways to yield. Practice at home and abroad proves that under the same soil and cultivation measures, selecting afforestation afforestation can generally increase timber output by about 30%. At present, the improvement of tree species in many countries in the world is based on the selection of excellent seed orchards and the seed or seedling planting of seed orchards. This kind of forest, which is bred by superior tree generations (seeds), will be better than normal stands