Establishing protected areas is a key approach to protecting nature. However, protected areas are often biased towards remote and less productive lands. It is important to evaluate the impacts protected areas have had, or in other words, what changes in outcomes of interest are attributable to protected areas. Studies that evaluate the impact of protected areas on vegetation—the state and processes that support biodiversity—are scarce and published in a range of disciplines. This systematic review will scope, identify, and synthesize studies that quantitatively measure the impact of protected areas on vegetation extent and condition. The findings will be useful for researchers and policy makers and provide important knowledge for setting post 2020 targets of the Convention on Biological Diversity. This review will also identify research gaps in the current evidence base and provide direction for future research. This review follows the Collaboration for Environmental Evidence guidelines for evidence synthesis and complies with the ROSES (RepOrting standards for Systematic Evidence Synthesis) reporting framework. We will use a comprehensive search strategy developed through several rounds of scoping review to cover databases; Web of Science, Scopus and CAB Abstracts, 16 organizational websites, google scholar and existing review documents. Our search terms and strategies aim to find impact evaluation studies (both peer-reviewed and grey literature) in English from protected areas globally. The search results will be screened at title, abstract, and then full text by two independent reviewers. A quality appraisal of evidence will be conducted using Joanna Briggs Institute (JBI) risk of bias tool. Review results will be presented in the form of narrative synthesis, as well as in meta-analysis form, where data quality and amount allow.

中文翻译：

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陆地保护区对植被范围和状况的影响：系统审查方案

建立保护区是保护自然的关键方法。但是，保护区通常偏向偏远和生产力较低的土地。重要的是评估保护区产生的影响，换句话说，感兴趣的结果有哪些变化可归因于保护区。评估保护区对植被（支持生物多样性的状态和过程）的影响的研究很少，并且发表在一系列学科中。这项系统的审查将确定范围，确定和综合研究，以定量地衡量保护区对植被范围和状况的影响。研究结果将对研究人员和政策制定者有用，并为确定《生物多样性公约》 2020年后目标提供重要知识。这次审查还将确定当前证据基础中的研究空白，并为将来的研究提供指导。此项审查遵循《环境证据协作指南》中关于证据综合的规定，并符合ROSES（系统证据综合的RepOrting标准）报告框架。我们将使用通过几轮范围审查而开发的综合搜索策略，以覆盖数据库；Web of Science，Scopus和CAB摘要，16个组织网站，谷歌学者和现有的审阅文件。我们的搜索字词和策略旨在从全球保护区中找到英文的影响评估研究（同行评审和灰色文献）。搜索结果将由两名独立的审阅者在标题，摘要和全文中进行筛选。将使用乔安娜·布里格斯研究所（JBI）的偏倚风险工具对证据进行质量评估。在数据质量和数量允许的情况下，评审结果将以叙述性综合形式和荟萃分析形式呈现。