This study presents a critical review analysis of greenery systems research through a bibliometric approach. The purpose of this study is to provide a holistic overview by (i) the development of the field; (ii) the research trends and the main issues; and (iii) the main gaps still observed in the literature. Therefore, this paper provides the past, the present and the potential future of this scientific topic and serves as an orientation and guide for researchers who aim for a better understanding of the main progress and gaps. A detailed analysis of 1918 documents found in the Scopus database for the 1974–2019 period was conducted. Content analysis of titles, keywords and abstracts revealed that most of the research has focused on the study of green roofs. Previously this topic was dominated by water runoff analysis, while recent contributions acknowledge greenery as an effective microclimate mitigation strategy, especially in urban areas. The United States was the most productive country, representing almost 20% of the total documents. Over 86% of the relevant documents were published since 2009. Overall, research on this topic is increasing, with new methods and directions but some gaps remain particularly on the areas of environmental impact, costs, health, outdoor thermal comfort, and vertical greenery systems.

本研究通过文献计量方法对绿色植物系统研究进行了重要的评论分析。这项研究的目的是通过（i）该领域的发展提供一个整体的概述；（ii）研究趋势和主要问题；（iii）文献中仍存在的主要差距。因此，本文提供了该科学主题的过去，现在和潜在的未来，并为希望更好地了解主要进展和差距的研究人员提供了指导和指导。对Scopus数据库中1974-2019年期间发现的1918个文档进行了详细分析。对标题，关键词和摘要的内容分析表明，大多数研究都集中在绿色屋顶的研究上。以前，该主题主要由水流量分析组成，尽管最近的贡献承认绿化是一种有效的缓解小气候的策略，尤其是在城市地区。美国是生产力最高的国家，几乎占文件总数的20％。自2009年以来，已发布了超过86％的相关文件。总体而言，有关该主题的研究正在不断增加，采用了新的方法和方向，但在环境影响，成本，健康，室外热舒适性和垂直绿化系统等方面仍存在一些差距。