The effect of heavy or ‘free growth’ thinning on oak (Quercus petraea and Q. robur)
The effect of heavy or ‘free growth’ thinning on oak (Quercus petraea and Q. robur)
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严重或“自由生长”疏伐对橡木（栎树和栎树）的影响
DOI：
10.1093/forestry/69.4.303
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
G. Kerr
中科院分区：
文献类型：
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作者：
G. Kerr
自由生长是一种重间伐，旨在最大限度地增加直径，并在相对较短的周期内生产有价值的木材。本文描述了一项实验，研究了在1930年种植的栎林（栎）上自由生长的应用。在58岁时，自由生长间伐导致胸高平均直径39.0 cm，估计平均树体积为0.98 m3，而等效冠薄树木的平均树径为29.3 cm和0.52 m3。折现现金流量计算表明，假设增加的修剪强度会产生很大比例的贴面质量木材，那么使用3%的折现率可以证明自由生长的橡树变薄是合理的；一项独立评估表明这是可能的。自由生长的栎树间伐在英国阔叶造林中并不常见，这可能是因为控制外生芽的成本。建议对其他树种如白蜡树、梧桐树和野樱桃更适宜。
Summary Free growth is a type of heavy thinning which aims to maximize diameter increment and produce valuable timber on a relatively short rotation. An experiment is described which investigated the application of free growth to a stand of oak {Quercus petraea and Q. robur ) planted in 1930. At age 58 free growth thinning had resulted in a mean diameter at breast height of 39.0 cm with an estimated mean tree volume of 0.98 m3, compared with 29.3 cm and 0.52 m3 for equivalent crown thinned trees. Discounted cash flow calculations showed that free growth thinning of oak could be justified using a 3 per cent discount rate assuming that the increased intensity of pruning results in a large proportion of veneer quality timber; an independent assessment indicated this may be possible. Free growth thinning of oak is not a common practice in British broadleaved silviculture probably because of the cost of controlling epicormic shoots. It is suggested that it may be more appropriate to other species such as ash, sycamore and wild cherry.