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弗吉尼亚栎(Quercus virginiana)原产美国南部和东南沿海平原,是该地区硬叶阔叶林的优势树种,具有很强的耐盐性,是我国华东地区沿海防护林和园林绿化引种树种。本文研究了其种子的吸水和失水特性,盐分、温度以及播种深度对种子萌发的影响。结果表明:(1)果实的吸水和失水速率较快,果实含水量降至15%左右时种子已经失活;(2)种子萌发和幼苗阶段均有较强的耐盐能力;(3)高温和低温都不利于弗吉尼亚栎种子的萌发;(4)0~10 cm的播种深度不影响种子的萌发率,但随着播种深度的增加其萌发指数显著降低。表明,弗吉尼亚栎适合种子育苗,其萌发特性完全适应沿海地区的盐碱和沙埋等环境,有利于种群在沿海地区的更新和扩张,适于在我国亚热带海岸种植。
Quercus virginiana native to the southern United States and the southeast coastal plain, is the dominant species of hardwood broad-leaved forest in the region, with strong salt tolerance, is the introduction of species of coastal shelterbelt and landscape in eastern China. In this paper, the effects of water absorption and dehydration, salt content, temperature and sowing depth on seed germination were studied. The results showed that: (1) the rate of fruit water absorption and water loss was faster, the seeds had already been inactivated when the water content of fruit dropped to about 15%; (2) the salt tolerance of both seed germination and seedling stage was strong; (3) Both high temperature and low temperature are not conducive to the germination of the seeds of Quercus virginiana. (4) Seeding depth of 0-10 cm did not affect the seed germination rate, but the germination index decreased significantly with the sowing depth. The result shows that Virginia oak is suitable for seedling nursery. Its germination characteristics are completely adapted to the environment such as saline and sand burial in the coastal areas, which is beneficial to population renewal and expansion in the coastal areas and suitable for planting in the subtropical coast of China.