北美鹅掌楸不同种源在闽北山区的生长表现及评价

在福建省洋口国有林场,对从美国引进的北美鹅掌楸3个种源进行苗期试验并建立测定林,在6年生时对测定林进行调查和分析测定。方差分析结果表明,不同种源苗高、地径的差异均达到0.05显著水平;6年生时树高、胸径和单株材积平均值分别达6.41 m、10.94 cm和0.03561 m3,与本地乡土速生落叶树种南酸枣比较,生长性状表现相当,能较好适应闽北地区的生长。各种源间树高、胸径和材积生长量差异均不显著,但在个体水平上仍存在较大的差异,树高、胸径、材积个体水平的变异系数都约为相对应指标种源水平的4倍,从优良种源的292株个体中选择了10株优良的个体作为杂交育种或无性系利用的繁殖材料。

Growth and assessment of diffferent Liriodendron tulipifera provenances introduced to North Fujian China

Nursery performance trials were conducted and the tested plantations were established in Yangkou National Forest Farm,Fujian Province for 3 Liriodendron tulipifera provenances introduced from USA.At age 6,tree growth of the tested plantation were surveyed and analyzed.The results of variance analysis showed that the difference of seedling height and ground diameter among different provenances were significant(P<0.05).Mean height,DBH and volume of individual Liriodendron tulipifera trees were 6.41 m,10.94 cm and 0.03561m3,respectively,and their performance were similar to the local fast-growing deciduous tree species Choerospondias axillaris,indicating its growth well in north Fujian Province.Mean height,DBH and volume among different Liriodendron tulipifera provenances were not statistically significant.But growth variance at individual tree levels was high,and variance coefficient of height,DBH and volume at individual tree levels were 4 times higher than those of corresponding provenance levels.Ten superior individual trees were selected from 292 trees from superior provenances for cross-breeding or clone utilization material.