The degradation of the water quality of the Baltic Sea is an ongoing problem, despite investments in measures to reduce external inputs of pollutants and nutrients from both diffuse and point sources. Excessive inputs of nutrients coming from the surrounding land are among the primary causes of the Baltic Sea eutrophication. Diffuse sources, of which most originate from agricultural activities, are two dominant riverine pollution pathways for both nitrogen and phosphorus. Recently, there is growing attention on the reuse of carbon, nitrogen and phosphorus from agricultural waste streams. However, to our knowledge, no comprehensive and systematic assessment of ecotechnologies focusing on recovery or reuse of these substances in the agricultural sector is available. This map will examine what evidence exists relating to effectiveness of ecotechnologies (here defined as ‘human interventions in social-ecological systems in the form of practices and/or biological, physical, and chemical processes designed to minimise harm to the environment and provide services of value to society’) in agriculture for the reuse of carbon and/or nutrients (nitrogen and phosphorus) in the Baltic Sea region and boreo-temperate systems. We will search for both academic and grey literature: English language searches will be performed in 4 bibliographic databases and search platforms, and Google Scholar, while searches in 38 specialist websites will be performed in English, Finnish, Polish and Swedish. The searches will be restricted to the period 2013 to 2017. Eligibility screening will be conducted at two levels: title and abstract (screened concurrently for efficiency) and full text. Meta-data will be extracted from eligible studies including bibliographic details, study location, ecotechnology name and description, type of outcome (i.e. recovered or reused carbon and/or nutrients), type of ecotechnology in terms of recovery source, and type of reuse (in terms of the end-product). Findings will be presented narratively and in a searchable geographically explicit database, visualised in an evidence atlas (an interactive geographical information system). Knowledge gaps and knowledge clusters in the evidence base will be identified and described.

中文翻译：

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关于波罗的海和北温带地区的农业中生态技术对碳和养分的回收和再利用的有效性，存在哪些证据？系统的地图协议

尽管投资了减少减少来自分散源和点源的污染物和养分的外部投入的措施，波罗的海的水质下降仍然是一个持续的问题。来自周围土地的过多养分输入是波罗的海富营养化的主要原因之一。大部分来自农业活动的扩散源是氮和磷的两个主要河流污染途径。最近，人们越来越关注从农业废物流中再利用碳，氮和磷。然而，据我们所知，目前尚无针对农业部门中这些物质的回收或再利用的生态技术的全面，系统的评估。该地图将检查存在哪些与生态技术有效性相关的证据（此处定义为“人类生态社会系统中的干预措施，其形式为实践和/或生物，物理和化学过程，旨在最大程度地减少对环境的损害并提供对生态系统的服务农业对波罗的海地区和北温带系统中的碳和/或养分（氮和磷）的再利用。我们将搜索学术文献和灰色文献：将在4个书目数据库和搜索平台以及Google Scholar中进行英语搜索，而在38个专业网站中将以英语，芬兰语，波兰语和瑞典语进行搜索。搜索将限于2013年至2017年。资格筛选将在两个级别进行：标题和摘要（同时进行筛选以提高效率）和全文。元数据将从符合条件的研究中提取，包括书目详细信息，研究位置，生态技术名称和描述，成果类型（即回收或再利用的碳和/或养分），就回收源而言的生态技术类型以及再利用类型（就最终产品而言）。调查结果将以叙事方式呈现在可搜索的地理信息数据库中，并以证据图集（交互式地理信息系统）可视化。将确定和描述证据基础中的知识差距和知识集群。回收或再利用的碳和/或养分），就回收来源而言的生态技术类型和再利用类型（就最终产品而言）。调查结果将以叙事方式呈现在可搜索的地理信息数据库中，并以证据图集（交互式地理信息系统）可视化。将确定和描述证据基础中的知识差距和知识集群。回收或再利用的碳和/或养分），就回收来源而言的生态技术类型和再利用类型（就最终产品而言）。调查结果将以叙事方式呈现在可搜索的地理信息数据库中，并以证据图集（交互式地理信息系统）可视化。将确定和描述证据基础中的知识差距和知识集群。