Legacy effects of precommercial thinning on the natural regeneration of next rotation balsam fir stands in eastern Canada

IF 1.7 3区农林科学 Q2 FORESTRY

Silva Fennica Pub Date : 2019-01-01 DOI:10.14214/sf.10209

Claudie-Maude Canuel, N. Thiffault, Michael K. Hoepting, James C. G. Farrell

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引用次数: 2

Abstract

The Green River precommercial thinning (PCT) trial was established between 1959â1961 in New Brunswick (Canada) within natural balsam fir ( (L.) Mill.)-dominated stands. Three silviculture scenarios differing only by the increasing nominal spacings of PCT treatments (1.2 m, 1.8 m, 2.4 m) were compared to an unthinned control within randomized replicates that were clearcut harvested in 2008 and treated with herbicide in 2011. During the fourth post-harvest growing season, we assessed regeneration, competing vegetation and coarse woody debris (CWD; differentiated between large woody debris and slash) to assess the legacy effects of PCT on regeneration of next rotation stands. Our results confirmed that silviculture scenarios including PCT significantly increased conifer stocking in treated plots compared to control conditions, but only in the 1.8 m nominal spacing. Considering that treated and untreated stands were fully stocked, we conclude that PCT using the spacing gradient tested has no legacy effect on the regeneration of next rotation natural balsam fir stands. Given the known sensitivity of balsam fir to future climate conditions in this region, we suggest that future treatments should promote tree species diversity to support ecosystem resilience to climate change by favouring more warm-adapted species, such as some hardwoods.Abies balsamea

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加拿大东部商业前间伐对下一次轮作香脂冷杉林分自然更新的影响

绿河商业前间伐(PCT)试验于1959 - ~ 1961年在加拿大新不伦瑞克省的天然香脂冷杉(L.)中建立。机控制站。将三种仅因PCT处理的标称间距(1.2 m, 1.8 m, 2.4 m)增加而不同的造林方案与2008年采伐后使用除草剂的随机重复中未稀释的对照进行了比较。在收获后的第四个生长季节，我们评估了更新、竞争植被和粗木屑(CWD;以评估PCT对下一个轮作林分再生的遗留影响。我们的研究结果证实，与对照相比，包括PCT在内的造林方案显著增加了处理样地的针叶树蓄积量，但仅在名义间距1.8 m范围内。考虑到处理过的林分和未处理过的林分均有充足的库存，我们得出结论，采用所测试的间距梯度的PCT对下一次轮作天然香脂冷杉林分的更新没有遗留效应。鉴于该地区香脂冷杉对未来气候条件的敏感性，我们建议未来的处理应促进树种多样性，以支持生态系统对气候变化的适应能力，如一些硬木。冷杉属balsamea

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来源期刊

Silva Fennica 农林科学-林学

CiteScore

3.50

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Silva Fennica publishes significant new knowledge on forest sciences. The scope covers research on forestry and forest ecosystems. Silva Fennica aims to increase understanding on forest ecosystems, and sustainable use and conservation of forest resources. Use of forest resources includes all aspects of forestry containing biomass-based and non-timber products, economic and social factors etc.