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一、前言泡桐是我国重要的速生用材树种之一,在我省陇东、陇南和陇中南部有天然分布与人工栽培的历史。由于它具有生长快、材质好、用途广、工艺性能好的特点,八十年代以来在我省宜桐区已成为主要的造林树种。从城乡庭院绿化、“四旁”绿化以至农桐间作,沟、滩、坡、台及低山造林,已经形成优势先锋树种而被广泛采用。根据调查统计,截止1987年上半
I. Introduction Paulownia is one of the important species of fast-growing timber in our country. In the eastern part of our province, Longdong, Longnan and Longzhong have natural distribution and artificial cultivation history. Because of its rapid growth, good material, wide use, good process performance characteristics, since the eighties Yi Tai area has become the main afforestation species. Greening from the urban and rural courtyard, “surrounded by” afforestation as well as inter-crop farming, ditch, beach, slope, Taiwan and low mountain afforestation, has been the formation of advantages pioneer species and has been widely used. According to the survey statistics, the first half of 1987