Integrated quantitative bibliometric and in-depth qualitative content analysis of global biodegradable liquid mulching film research: Progress, hotspots and prospect

Abstract Biodegradable liquid mulching film (LMF) as a new alternative to alleviate the agricultural plastic pollution has attracted increasing attentions for sustainable development of agriculture, especially in China. However, the global research status and knowledge gaps of LMF are still unclear despite expanding academic literatures, hindering its promotion. Here, a data-driven analysis integrating the advantages of bibliometric visualization technology and content analysis was firstly conducted to present an objective and comprehensive overview of LMF at global level. A total of 467 English and Chinese literatures were analyzed to elucidate its global development history, research hotspots, and future research directions. The studies on LMF have increased over time but are still nascent, and Italy and China are the most productive and influential countries with the most influential institutions and authors. The research hotspots have shifted from exploitation of LMF using natural and waste bio-based polymers and synthetic polymers (1998–2005) to plant cultivation effectiveness evaluation (2006–2021) and impact assessment of soil ecosystem (2016–2021). However, studies on the standards establishment, performance improvement, response of soil microbial to LMF mulching, degradation mechanisms, and its long-term effects on agroecosystem are still insufficient and of great significance for the future study. This study offers critical information and guidance to promote the development and application of LMF.