Long-term impacts of partial cutting and clearcutting on beetle biodiversity in the Haute-Mauricie region of Quebec

部分采伐作为一种保持生物多样性、满足FSC（森林管理理事会）等环境认证和确保可持续木材生产的手段得到了广泛的提倡。最初的研究比较了部分砍伐和防护林采伐对生物多样性的影响，结果表明，保留更多的树木往往有利于生物多样性。然而，还有待证明的是，一旦森林树冠重新建立（采伐后20年以上），采伐的任何负面 ** 影响是否会持续存在于林分中，以及 ** 从长期来看，异龄造林（部分采伐）或同龄造林（皆伐）产生的林分是否 ** 更具复原力。该项目是与Groupe REMABEC的一项新合作，Groupe REMABEC是加拿大林业的长期成员，具有强烈的环境承诺，我们将比较复制林分之间的甲虫生物多样性，这些林分1）在旧的部分砍伐（1995年）后再生（2015年），2）在旧的单次部分砍伐（1995年）后再生，3）再生 ** 从旧的皆伐（1995年）4）最近的皆伐（2015年）和5）未砍伐的控制站。我们将确定地面 ** 甲虫和saxylylic甲虫采样陷阱和飞行拦截陷阱的物种和比较 ** 组合使用广义线性混合模型和多元回归树。作为一个 ** 初始工作假设，我们预计甲虫组合在看台上起源于单程部分削减将 ** 是无法区分的未砍伐的森林，而甲虫组合在看台上起源于皆伐或 ** 部分削减与第二次通过收获将是彼此相似的。该项目将为REMABEC** 提供一个针对其作业区域的高分辨率（>300个物种）生物多样性数据库，然后他们可以 ** 使用该数据库来严格评估当前采伐作业的生态影响，并推进FSC认证 **。它还可以用来修改或发展采伐做法，提高 ** 管理的林分的养护价值，通过避免对维持生物多样性无效的造林战略来削减成本。

Partial cutting has been widely advocated as a means to maintain biodiversity, satisfy environmental**certification like FSC (Forest Stewardship Council) and assure sustainable wood production. Initial studies that**compared biodiversity impacts partial cutting and shelterwood harvests to clearcuts have shown that leaving**more retention often benefits biodiversity. However, it remains to be demonstrated whether any negative**effects of cutting persist in stands once forest canopies have re-established (>20 years post-harvest) and**whether stands originating from uneven-aged silviculture (partial cuts) or even-aged silviculture (clearcuts) are**more resilient over the long-term. This project is a new collaboration with Groupe REMABEC, a long-time**member of the forest industry in Canada with a strong environmental commitment, where we will compare**beetle biodiversity between replicated stands that have 1) regenerated following older partial cuts (1995) with a**subsequent recent second pass (2015), 2) regenerated after older single-pass partial cuts (1995), 3) regenerated**from older clearcuts (1995) 4) recent clearcuts (2015) and 5) uncut control stands. We will identify ground**beetles and saproxylic beetles sampled with pitfall and flight intercept traps to species and compare**assemblages using a combination of generalized linear mixed models and multivariate regression trees. As an**initial working hypothesis, we expect beetle assemblages in stands originating from single-pass partial cuts will**be indistinguishable from uncut forests, whereas beetle assemblages in stands originating from clearcuts or**partial cuts with a second pass harvest will be similar to one another. This project will provide REMABEC**with a high-resolution (>300 species) biodiversity database specific to their operating area which they can then**use to critically evaluate the ecological impacts of current harvesting operations and advance FSC certification**of operations. It can also be used to modify or develop harvesting practices that improve conservation value of**managed stands, cut costs by avoiding silvicultural strategies that are ineffective for maintaining biodiversity.