论文部分内容阅读
白榆是我国分布广、栽培历史悠久的优良乡土树种。但过去对白榆种源未开展系统研究,自1980年开始,由中国林科院林研所主持,组织了全国白榆种源选择科技协作,本试验属全国协作的组成部分,在省内组织了白榆种源选择研究协作组,从该年开始,进行国内全分布区的地理种源试验、产地加家系子代测定试验和省内产地试验。其目的主要是探索白榆全分布区种源及省内不同种源的变异规律,为提高白榆选种和生产水平提供科学依据。经1980～1985年多点苗期和造林试验,初步
Ulmus is widely distributed in our country, cultivation has a long history of excellent native tree species. However, in the past, there was no systematic research on the provenance of Ulmus pumila. Since 1980, the forestry institute of the Chinese Academy of Forestry hosted and organized scientific and technological cooperation on the selection of the provenance of Ulmus pumila. This experiment is an integral part of the national collaboration. The elm provenance selection research collaboration group, starting from that year, the geographical distribution of the full range of geographical provenance test, origin plus pedigree offspring test and place of production test in the province. The main purpose is to explore the provenance of elm distribution area and the variation rules of different provenances in the province to provide scientific basis for improving the selection and production level of elm. After 1980 ~ 1985 more seedling and afforestation experiment, preliminary