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首页> 外文期刊>Quarterly Journal of Forestry >Transformation of conifer plantations to mixed forests: initial guidance from an experiment in Wykeham forest, North Yorkshire
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Transformation of conifer plantations to mixed forests: initial guidance from an experiment in Wykeham forest, North Yorkshire

机译：针叶树人工林向混交林的转化：北约克郡Wykeham森林的一项实验的初步指导

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In 1950, a species enrichment experiment was established in a 21 years-old Scots pine (Pinus sylvestris) plantation growing on an ironpan soil in the North York Moors. Traces 5m wide were cut through the pines at regular intervals and these felled areas were then ploughed and planted with over 25 different conifer and broadleaved species. After 25 years, only three species had completely failed, most were at least half the height of the pine nurse stand, and several (Abies grandis, A. procera, A. veitchii, Larix decidua, L. kaempferii, and L. eurolepis) formed part of the upper canopy. In the early 1990s, increasing amounts of natural regeneration of a range of species was noted in the experiment. As a consequence, in 1996 the plots were subdividedinto an area thinned using a prescription based upon continuous cover forestry (CCF) principles and an unthinned control. The CCF prescription used an 'inverse-J' curve model with a target diameter of 65cm, a 'q'value of 1.5 and a residual basal area of25 m~2 ha~(-1). The regeneration has shown a favourable response to the thinning with a cohort of Abies and Larix saplings starting to develop. Light measurements show appreciably greater light levels in the thinned stand than in the more densely stocked control plot. The implications of these results for CCF management of British conifer stands are discussed, with emphasis upon the need for clear definition of target stand structures and regular monitoring.
机译：1950年，在北约克郡高地铁锅土壤上生长的21岁的苏格兰松树（Pinus sylvestris）人工林中建立了物种富集实验。定期从松树上切下5m宽的痕迹，然后将这些砍伐的面积耕作并种植25种以上的针叶树和阔叶树种。 25年后，只有三种完全灭绝，大多数至少达到了松树护士站立架高度的一半，还有几种（大冷杉，A。procera，A。veitchii，Larix decidua，L。kaempferii和L. eurolepis）形成顶篷的一部分。在1990年代初期，实验中注意到一系列物种的自然再生数量增加。结果，在1996年，根据连续覆被森林（CCF）原则和未稀疏的控制措施，将这些土地细分为一个面积缩小的区域。 CCF处方使用“逆J”曲线模型，目标直径为65cm，“ q”值为1.5，剩余基础面积为25 m〜2 ha〜（-1）。随着变种的冷杉和落叶松树苗开始发育，再生对变薄表现出良好的响应。光照测量表明，在稀疏林分中，光照强度比在密度较高的对照图中明显高。讨论了这些结果对英国针叶林林分CCF管理的影响，重点是需要明确定义目标林分结构和定期监测。

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