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With the rapid growth of Internet technology, the blockchain has been developed fast in recent years with the wide expansions in finance, medicine, public welfare, and other fields. At the same time, the blockchain technology has also attracted researchers’ increasing attention, leading to a large number of scientific outputs that made significant contributions to blockchain research. However, few attempts can be found to investigate the development of blockchain based on the literature in this area. Therefore, this paper focuses on blockchain research by introducing bibliometric methods and comprehensively analyzes its status quo, emerging trends, and development path. Based on the above research, this paper draws two main conclusions. First, we made a comprehensive investigation of blockchain research in the past five years and then found that the main research directions in this area are Bitcoin, digital currency, and Fintech. Second, the development of blockchain research generally presents a trend of π-transformation based on the main path analysis. The above studies provide a brief view for beginners who want to learn blockchain research in a direct way and contribute to extend the theoretical foundation of blockchain research by giving a comprehensive bibliometric analysis.

Never before have we had so many different ways to investigate China subtropical climate change as it is gradually becoming significant to know the details about the relationship between climate change and China, specifically in subtropical areas. To learn the current situation and emerging trends of China subtropical climate change research, this article utilizes CiteSpace to provide a general picture about the research field by analyzing 926 publications between 1990 and 2017, which are retrieved from Web of Science. According to the results, some interesting findings are illustrated in this study: (a) The papers that investigate interdecadal change and data-model comparison made great theoretical contributions to China subtropical climate change research; (b) China, the United States, Australia, and Germany are the biggest contributors to China subtropical climate change research, and most of the productive institutions are from China; (c) the emerging trends of China subtropical climate change research are "soil moisture," "net ecosystem exchange," and "autotrophic respiration"; and (d) most of China subtropical climate change studies are related to atmospheric model intercomparison project model, CO 2 fertilization, and pollen record. This article provides an overall analysis about China subtropical climate change research for researchers who are interested in this field to do further investigations.

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