美国可食松1年生播种苗生长规律及形态特点

Growth Rule and Morphological Characteristics of Annual Pinus edulis Seeding Seedlings

美国可食松P inus edu lis是自美国近两年引进的一种常绿针叶灌木树种.对其1年生播种苗进行了全年的生长观测、生物量测定以及形态特点的研究,并以本地树种油松P inus tabu laef orm is 1年生播种苗作为对比,将可食松1年生苗的生长划分为4个时期(出苗期,幼嫩期,速生期和苗木硬化期).结果表明:可食松1年生苗高生长速生期全年仅1次,地径速生期则出现2次;可食松苗地上部分粗壮矮小、初生叶繁多,地下部分具深根性特点.同时对该树种抗逆性进行了初步分析.

Pinus edulis is an evergreen coniferous shrub introduced from USA in recent two years. Observation on the yearly growth and research on the biomass and morphological characteristic of Pinus edulis and Pinus tabulaeformis annual seeding seedlings were conducted with the latter as the contrast. The results show that the growth of annual Pinus edulis seeding seedlings could be divided into four stages, emergence of seedlings, little and tender seedlings, quick growth and seedling rigidification; that quick growth of seedling height happens only once through the year, but quick growth of stem diameter on the ground does twice; and that aboveground part of Pinus edulis seedling is thick and short and the acrospires are dense while the under-ground part of Pinus edulis seedling enjoys a deep root. Meanwhile the stress resistances of Pinus edulis were preliminarily analyzed. All this provides some theoretical references to successful introduction and seedling stage management.