ABSTRACT

Northern red oak originates from eastern North America and was introduced to Swedish forestry in the 1940–1950s. Long-term experimental plots were established in some of the early plantations to monitor growth and yield. This study summarizes the results from eight of the oldest experimental plots from the northern limit of the red oak’s distribution in Europe. All plots were situated in southern Sweden and the stand age at the last measurement was 53–83 years. The growth of red oak was compared with 53–95-year-old native oak in six other nearby experimental plots, although this was not a controlled tree species comparison. The greatest mean annual volume increment of red oak was 6.5 m³ ha⁻¹ yr⁻¹. The mean volume production at an age of ca. 60 years was 5.3 and 3.6 m³ ha⁻¹ yr⁻¹ for plots of red oak and native oak, respectively. Top height at this age was on average 22 m for red oak, about 4 m greater than for native oak. The mean diameter of the 100 largest trees ha⁻¹ was 32 cm for red oak at an age of ca. 60 years. Comparison of the relative growth rate revealed no pronounced difference between the species.

摘要

北方红橡木原产于北美东部，并于 1940 至 1950 年代引入瑞典林业。在一些早期种植园建立了长期试验地，以监测生长和产量。本研究总结了来自欧洲红橡树分布北部边界的八个最古老的实验地块的结果。所有地块都位于瑞典南部，最后一次测量的林龄为 53-83 年。红橡树的生长与附近其他六个试验地中 53-95 年树龄的原生橡树的生长情况进行了比较，尽管这不是受控的树种比较。红橡木的最大年平均体积增量为 6.5 m ³ ha ^-1 yr ^-1. 大约年龄的平均产量。对于红橡树和原生橡树地块，60 年分别为 5.3 和 3.6 m ³ ha ^-1 yr ^-1。在这个年龄，红橡木的顶部高度平均为 22 m，比原生橡木高约 4 m。100 棵最大树 ha ^-1的平均直径对于大约 10 年的红橡树来说是 32 厘米。60 年。相对生长率的比较表明物种之间没有明显差异。