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为了进一步弄清桂西北种植光皮桦 (Betula luminf era)的生长量 ,于 1 997年 4月在广西林朵林场营造光皮桦人工纯林 ,与马尾松纯林进行对比研究 ,结果表明 :3.5年生光皮桦林分的平均树高、平均胸径和平均蓄积量分别为 7.42 m、 7.50 cm和 30 .0 6 m3· hm-2 ,分别比同龄马尾松林分的平均高 (4.58m)、平均胸径 (4.96cm)、平均蓄积 (1 8.1 93m3/hm2 )提高 62 .0 %、 51 .2 %和 65.3%。说明该区营造光皮桦人工幼林的生长量较大 ,建议在相似立地条件下局部推广营造光皮桦人工林。
In order to further understand the growth of Betula luminfrae in the northwestern Guangxi Province, a artificial pure forest of Betula luminifera was planted in Linfu Forest Farm, Guangxi in April 1997, which was compared with pure P. massoniana forest. The results showed that: The average tree height, average DBH and average stock volume of 3.5-year-old Betula platyphylla stand were 7.42 m, 7.50 cm and 30.0 06 m3 · hm-2, respectively, higher than the average stand height of Pinus massoniana forest (4.58m) The average DBH (4.96cm) and the average volume (1 8.193m3 / hm2) increased 62.0%, 51.2% and 65.3% respectively. The result shows that the growth of artificial young plantation of Betula luminifera in this area is relatively large. It is suggested that the plantation of Betula luminifera can be promoted locally under similar site conditions.