论文部分内容阅读
26年引种研究表明,原产云贵高原的珍贵树种秃杉能适应江苏宁镇丘陵句容茅山低丘立地条件和北亚热带气候,正常生长。除苗期会因冬季极端低温出现冻害,幼龄(5a以下)遭遇持续高温干旱日灼危害,影响成活保存率外,一般5a后适应性逐渐增强,已无寒害、旱害、日灼危害发生。在1.1m×2m初植密度粗放管抚下,20~26年生林分平均树高10.30~12.20m;胸径17.6~19.9cm;年均生长量分别达0.52~0.49m和0.9~0.8cm。最优单株树高15.10m,胸径30.1cm,平均生长量树高0.60m,胸径1.2cm,显示出栽培应用潜力。
Introduced 26 years study shows that the native species of Taiwan Guiyang-Guizhou Plateau can be adapted to Taihang Jurong Junling hill hilly conditions and the northern subtropical climate, normal growth. In addition to frost damage in extreme low temperatures in winter, juveniles (below 5 years) suffer from persistent sunburn caused by high temperature and drought, affecting the survival and preservation rate. Generally, their adaptability gradually increases after 5 years and no chilling damage, drought damage and sunburn occur . Under the initial planting density of 1.1m × 2m, the mean tree height of 20 ~ 26 year-old stands was 10.30 ~ 12.20m and the diameter at breast height was 17.6 ~ 19.9cm. The average annual growth was 0.52 ~ 0.49m and 0.9 ~ 0.8cm respectively. The optimum tree height was 15.10 m, diameter at breast height was 30.1 cm, average height of tree was 0.60 m and diameter at breast height was 1.2 cm, which indicated the potential of cultivation and application.