Method for constructing China fir double-system hybrid seed orchard

Abstract

The invention relates to a method for constructing a China fir double-system hybrid seed orchard, and belongs to the technical field of forestry. The method comprises the following steps: parent selection; orchard site selection and plantation density determination; seed orchard graft material and method selection, and clone configuration; high-yield management of the seed orchard. According to the method disclosed by the invention, heteroses of superior cross combinations of China firs are sufficiently utilized to produce a new variety of China fir seeds with the heteroses so as to apply the new variety of China fir seeds to production. In areas of Zhejiang Province, such as Longquan, Suichang and the like, after seeds produced in the China fir double-system hybrid seed orchard are adopted to carry out seedling cultivation and forestation, a volume of forest tree growth is obviously higher than that after seeds produced in a same-generation China fir multi-system seed orchard are adopted to carry out seedling cultivation and forestation, and a yield increasing effect is obvious. According to a comparison testing result of existing China fir seed orchards of different generations, compared with common seeds, a six-year-survival survey result is that the highest wood volume practical gain of the seeds produced in the China fir double-system hybrid seed orchard reaches 46.0%, gain of a 2-generation China fir seed orchard is 32.0%, gain of a 1.5-generation seed orchard is 27.0%, and gain of a 1-generation seed orchard is 20.0%.

Description

technical field [0001] The invention belongs to the technical field of forestry, and in particular relates to a method for constructing a Chinese fir double-line hybrid seed garden. Background technique [0002] Chinese fir is the main fast-growing timber tree species in the southern forest area of ​​my country. Seedling breeding is mainly based on seed propagation. The selection of fast-growing high-quality varieties is the focus of Chinese fir genetics and breeding. The genetic improvement method is mainly to select high-quality materials and build seed gardens to produce seeds. In my country, multiple clones are mainly used to build multi-line fir seed gardens, and then multi-generational improvement is carried out. The multi-line seed garden is characterized by the participation of multiple parents in the construction, but the genetic gain of the seed garden seeds is not as good as the two-line hybridization of materials of the same generation. The seed orchard is high. ...

AI Technical Summary

Problems solved by technology

In my country, we mainly use multiple clones to build multi-line Chinese fir seed gardens, and then carry out multi-generational improvement. The multi-line seed garden is characterized by the participation of multiple parents in the construction, but the genetic gain of seeds in the seed garden is not as good as the two-line hybridization of materials of the same generation. seed orchard high