Biodiversity is vital for human well-being, but is threatened by human actions world-wide. In the boreal zone, harvesting and management of forests on an industrial scale is the most important factor driving habitat change and degradation. Over time different forest management regimes have been implemented but their impact on biodiversity at different spatial and temporal scales has not been systematically reviewed although non-systematic reviews on the topic exist. The aim of this article is to describe a protocol for a systematic review to synthesise and compare the impacts of two different forest management systems on biodiversity at different spatial and temporal scales. The topic for the systematic review arose from the discussions with the Finnish forestry sector and was further defined in a stakeholder workshop. Research questions addressed by the systematic review protocol are: (1) What are the stand-level effects of even-aged and uneven-aged forest management on boreal forest biodiversity in Fennoscandia and European Russia? (2) What is the effect of these same forest management systems on biodiversity at landscape level? Animal, plant, and fungal diversity is addressed. Bibliographic databases and organizational websites will be searched, and internet search engines will be utilized to find relevant literature. The searches will be conducted in English, Finnish, Swedish, and Russian. Articles will be screened regarding the inclusion and exclusion criteria at title, abstract, and full-text stage. The validity of included studies will be evaluated against appraisal criteria and studies categorized based on their risk of bias. A narrative synthesis will be conducted to describe the findings. If enough quantitative data can be retrieved from the studies, a meta-analysis will be conducted.

中文翻译：

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芬诺斯堪的亚和欧洲俄罗斯的均匀和不均匀森林管理对北方森林生物多样性有什么影响？系统的审查协议

生物多样性对人类的福祉至关重要，但受到全世界人类行动的威胁。在北方地区，以工业规模采伐和管理森林是驱动生境变化和退化的最重要因素。随着时间的流逝，已经实施了不同的森林管理制度，但是尽管存在关于该主题的非系统性审查，但尚未对它们在不同时空尺度上对生物多样性的影响进行系统地审查。本文的目的是描述一种用于系统综述的协议，以综合和比较两种不同森林管理系统在不同时空尺度上对生物多样性的影响。系统审查的主题来自与芬兰林业部门的讨论，并在利益相关者研讨会上得到了进一步定义。系统审查规程所解决的研究问题是：（1）芬诺斯堪的亚和欧洲俄罗斯，均匀和不均匀年龄的森林管理对北方森林生物多样性的立场有何影响？（2）这些相同的森林管理系统在景观一级对生物多样性有什么影响？解决了动物，植物和真菌的多样性。将搜索书目数据库和组织网站，并将利用互联网搜索引擎查找相关文献。搜索将以英语，芬兰语，瑞典语和俄语进行。在标题，摘要和全文阶段，将筛选有关包含和排除标准的文章。纳入研究的有效性将根据评估标准进行评估，并根据其偏倚风险对研究进行分类。叙述性综述将进行描述。如果可以从研究中检索到足够的定量数据，将进行荟萃分析。