Food security, a crucial issue for the development of humankind, is often severely constrained by water scarcity. As a globally recognized most advanced agricultural water-saving technology, drip irrigation under plastic mulch (DIPM) has played a significant role in grain production. However, a comprehensive review of the dual impacts of this practice in farmland remains lacking. This study has conducted an exhaustive review of DIPM research from 1999 to 2023 and employed CiteSpace software to perform a co-occurrence and clustering analysis of keywords in order to reveal research hotspots and trends. The results show that the attention to DIPM technology has increased annually and reached a peak in 2022. China leads in the number of publications in this field, reflecting its emphasis on agricultural water-saving technologies. This study critically discusses the dual impacts of DIPM on farmland. On the positive side, DIPM can improve soil temperature and moisture, enhance nutrient availability, promote water and nutrient absorption by roots, and increase the crop growth rate and yield while reducing evaporation and nitrogen loss, suppressing weed growth, decreasing herbicide usage, and lowering total greenhouse gas emissions. On the negative side, it will cause pollution from plastic mulch residues, damage the soil structure, have impacts on crop growth, and lead to increased clogging of drip irrigation systems, which will increase agricultural costs and energy consumption, hinder crop growth, hamper soil salinization management, and further reduce the groundwater level. The future development of DIPM technology requires optimization and advancement. Such strategies as mechanized residual-mulch recovery, biodegradable mulch substitution, aerated drip irrigation technology, and alternate irrigation are proposed to address existing issues in farmland triggered by DIPM. This review advocates for the active exploration of farming management practices superior to DIPM for future agricultural development. These practices could lead to higher yields, water-nitrogen efficiency, and lower environmental impact in agricultural development.

基于CiteSpace可视化软件对CNKI和WOS数据库共30000余篇文献进行了分析，通过关键词、发文机构、发文作者等特征对有关寒区土壤水运移的文献进行了统计分析。结果表明：寒区土壤水运移方向的研究方法包括数值模拟，实验研究与实地观测；研究的主要地区集中在我国中西部地区；其中水热耦合研究是当前关注的重点，针对水热盐运移实验观测和模型规律的研究较少，然而通过近20年的发文量呈现出上升趋势，并且具备了一定的规模。随着气候变化引起的冻土退化程度更加明显，更多的衍生问题被暴露出来，总的来看，为加强对寒区生态环境的保护，有关寒区土壤水分运移的研究开始呈现出精细化、多学科交叉等发展前景。

2013年以来,随着寒冷地区资源开发利用与工程建设规模不断扩大,国内外冻融岩石力学研究发展迅速。论文以2013～2020年Web of Science和CNKI数据库收录的冻融岩石力学领域相关论文为数据源,使用文献可视化软件CiteSpace构建了国内外冻融岩石力学研究的关键词共现网络、热点知识演进时区视图和发文高产机构知识图谱,并进行了图谱可视化分析。结合统计结果与知识图谱研究发现:(1)国内外冻岩力学研究处于快速发展阶段,参与国家和创新性研究成果逐年增加,研究状态火热;(2)论文在核心期刊与研究机构中的分布集中度较高,企业、科研院所课题研究参与度较低,难以发挥"产学研"综合优势;(3)热点研究可概括为冻融岩石多尺度力学损伤特性、裂隙岩体冻融损伤机制、岩石本构模型及数值模拟研究;(4)岩石多场耦合作用、成熟研究成果的工程转化运用将是后续研究的重点关注方向。

位于横断山脉西部的他念他翁山脉是中国冰川发育的典型区域,该地区的冰川领域研究工作对全球冰川与气候变化研究有特殊意义。本文利用CiteSpaceⅤ文献可视化分析工具,以数据库网站WEB OF SCIENCE作为数据源,检索2010～2020年间主题词为"glacier"的期刊论文。通过对关键词以及中心度的对比得出国外研究重点,探讨国际上冰川研究的热点问题以及重点研究方向,为他念他翁山脉的冰川学领域研究提供参考方向。

Remote sensing, as a crucial method to obtain information on water environmental processes, has become a major source of data, particularly of water environment and water resources, which are sensitive to global climate change. The bibliometric analysis provided here shows the research characteristics and developments of remote sensing-based observations of water environmental processes under a changing climate from 2000 to 2018. Visualized knowledge mapping is introduced to investigate the development status, scientific collaboration, involved disciplines, research hotspots and emerging trends of this field. The breadth and depth of remote sensing application in water environmental process studies have improved significantly as the number of related publications rose at an average annual growth rate of 15.97% in the 21st century. The United States and China were the leading contributors with the largest number of publications and all of the top 15 most active institutions. In addition, this field is a highly interdisciplinary field that covers a wide range of interests, from water resources to environmental science, geology, engineering, ecology, and agriculture. The application of remote sensing technology has significantly promoted the estimation of evapotranspiration and soil moisture, thereby offering a more complete perspective to the understanding of the water cycle. Additionally, climate change and its complex interactions with water environmental processes, including the occurrence of drought events, are of great significance and require special attention.