Wetlands in many parts of the world have been degraded, as use of the land for food production and forestry for human needs have taken precedence. Drainage of wetlands has led to deteriorated wetland conditions and lowered water tables. Across the world, there are several programs for wetland restoration and construction, primarily to reintroduce lost habitats for wildlife, and to obtain nutrient retention functions. In Sweden, recent dry and hot summers have reinforced interest in the hydrological functions that wetlands may have, in particular as potential support for water storage in the landscape and added groundwater storage during dry periods. However, the agreement on substantial effects on groundwater is limited, and there are several critical knowledge gaps, including the extent to which such effects extend outside the wetland itself, and how they vary with local conditions, such as topography, soil, and climate. Therefore, this review will address the groundwater storage effect of restoring, constructing or draining wetlands in the boreo-temperate region. We will conduct a systematic review of the evidence, drawing on both peer-reviewed and grey literature. Articles in English, Swedish, Norwegian, Danish, French, German and Polish will be retrieved from academic databases, Google Scholar, and websites of specialist organizations. We will screen literature in two stages, first at the title and abstract level and then in full text, the latter with blinded decisions by two independent reviewers for all articles. Articles will be included based on relevance criteria for a Swedish context: wetlands on previously glaciated soils in boreal and temperate climates. Data will be extracted from all included articles, including wetland type, intervention type, and hydrogeological setting. Studies will be subject to critical appraisal to evaluate their susceptibility to bias. Provided enough evidence of sufficient reliability, we will carry out meta-analyses of effect sizes in relation to various factors. The review will include a narrative synthesis in which we summarize the results of the review.

中文翻译：

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在温带和北方气候下恢复，建设或排水湿地对地下水的存储影响：系统的审查方案

由于人们优先考虑将土地用于粮食生产和林业，因此世界许多地方的湿地已经退化。湿地的排水导致湿地条件恶化，地下水位降低。在世界范围内，有几个湿地恢复和建设计划，主要是为了重新引入失去的野生动植物栖息地并获得养分功能。在瑞典，近来的干旱和炎热夏季使人们更加关注湿地可能具有的水文功能，特别是作为对景观中水的潜在支持以及在干旱期间增加地下水存储的潜在支持。但是，关于对地下水产生实质性影响的协议是有限的，并且存在一些关键的知识空白，包括这种影响在多大程度上扩展到湿地自身之外，以及它们如何随当地条件（例如地形，土壤和气候）而变化。因此，本综述将探讨在北温带地区恢复，建设或排水湿地的地下水存储效果。我们将根据同行评审和灰色文献对证据进行系统的审查。英文，瑞典文，挪威文，丹麦文，法文，德文和波兰文的文章将从学术数据库，Google Scholar和专业组织的网站中检索。我们将分两个阶段对文献进行筛选，首先是在标题和摘要级别，然后是全文，第二个阶段是由两名独立审稿人对所有文章进行盲目决定。根据瑞典语的相关标准，将包括相关文章：在北方和温带气候下，以前为冰川土壤的湿地。将从包括的所有文章中提取数据，包括湿地类型，干预类型和水文地质环境。研究将受到严格的评估，以评估其对偏差的敏感性。提供足够可靠的足够证据，我们将对与各种因素有关的效应大小进行荟萃分析。审查将包括叙述性综述，其中我们总结了审查的结果。