The existing research results of virtual modeling of rice plant, however, is far from perfect compared to that of other crops due to its complex structure and growth process. Techniques to visually simulate the archit...The existing research results of virtual modeling of rice plant, however, is far from perfect compared to that of other crops due to its complex structure and growth process. Techniques to visually simulate the architecture of rice plant and its growth process are presented based on the analysis of the morphological characteristics at different stages. Firstly, the simulations of geometrical shape, the bending status and the structural distortion of rice leaves are conducted. Then, by using an improved model for bending deformation, the curved patterns of panicle axis and various types of panicle branches are generated, and the spatial shape of rice panicle is therefore created. Parametric L-system is employed to generate its topological structures, and finite-state automaton is adopted to describe the development of geometrical structures. Finally, the computer visualization of three-dimensional morphologies of rice plant at both organ and individual levels is achieved. The experimental results showed that the proposed methods of modeling the three-dimensional shapes of organs and simulating the growth of rice plant are feasible and effective, and the generated three-dimensional images are realistic.展开更多
This research aims to clarify the significance of incorporating visual stimulation, in the form of foliage plants, into office desktop spaces. The experiments were conducted in a thermal environment with a temperature...This research aims to clarify the significance of incorporating visual stimulation, in the form of foliage plants, into office desktop spaces. The experiments were conducted in a thermal environment with a temperature range that was slightly uncomfortable. The indoor thermal environment evaluation index ETF was used to measure the effects that brain stimulation of foliage plants have on comprehensive thermal senses. We focus on visual stimulation with foliage plants, and quantitatively measure shifts in thermal senses that affect the body. Thermal environment conditions were established with air temperature in three stages (25℃, 28℃ and 31℃) and the atmosphere was kept homogeneous with wall surface temperature equal to air temperature. The visual stimulations consisted of seven types of office desk image: benjamin, pothos, oxycardium, baby tears, moss ball, cacti, and no plant. At around 27℃ to 29℃ ETF, improvements in thermal sensation, as measured by thermal sensation statements, were shown to have resulted from visual stimulation benefits. Also, at around 26℃ to 29℃ ETF, improvements in comfort were shown, due to visual stimulation benefits as well, in subjects’ comfortable-sensation statements. This benefit was significant when a foliage plant’s green coverage ratio came between 0.75% and 4.67%, the range which does not create an overwhelming feeling from the foliage plant.展开更多
利用文献计量学及文献可视化软件CiteSpace对国内外植物氮素代谢的研究现状、研究热点和发展趋势进行总结与分析,便于相关研究者了解本领域的研究现状。以2013—2022年Web of Science数据库(WoS)和中国知网数据库(CNKI)中植物氮素代谢...利用文献计量学及文献可视化软件CiteSpace对国内外植物氮素代谢的研究现状、研究热点和发展趋势进行总结与分析,便于相关研究者了解本领域的研究现状。以2013—2022年Web of Science数据库(WoS)和中国知网数据库(CNKI)中植物氮素代谢研究相关论文为文献来源,对发文量、主要研究力量、文献共被引、关键词进行分析。研究表明,发文量整体呈现逐渐增长的趋势,中国、美国、西班牙、德国和巴西等国家在植物氮素代谢领域的影响力较大,国内外机构发文量较多的是农林类高校及科研单位。氮的吸收利用、氮利用效率、盐胁迫、铵信号的介导和氮代谢相关酶的研究构成了植物氮素代谢的重要基础。近10年国际上植物氮素代谢研究的热点为植物耐受性、氮利用效率、氨同化、参与氮代谢相关酶和蛋白质的生物合成等;国内研究热点主要集中在不同氮素形态对植物品质和产量的影响、植物的氮素利用效率、碳氮代谢等相关方向,此外耐旱性、乙烯是最新研究前沿。今后植物氮素代谢应进一步围绕氮素利用效率这一目标展开研究,对氮肥施用进行长期动态观测,研究定量标准;关注植物碳-氮代谢协同机制;基于多组学技术开展植物氮素代谢的相关基因研究;整合植物氮素代谢调控网络。展开更多
草地在维持生物多样性,保护生态环境等方面具有重要意义,但不合理的放牧活动伴随气候因子的扰动可能对草地系统产生不可逆的消极影响。植物种群是构成群落并形成生产力的基本要素,系统地认识放牧对植物种群影响的研究脉络对进一步发挥...草地在维持生物多样性,保护生态环境等方面具有重要意义,但不合理的放牧活动伴随气候因子的扰动可能对草地系统产生不可逆的消极影响。植物种群是构成群落并形成生产力的基本要素,系统地认识放牧对植物种群影响的研究脉络对进一步发挥草地生态系统的生态意义和经济效益具有重要作用。因此,本文基于文献计量学,通过CiteSpace软件对国内外有关放牧对植物种群影响的相关文献进行统计,就发文趋势及分布,研究主题及演变方向,研究特点与不足,未来创新与突破进行探讨。结果表明:1999~2022年国内外发文量随时间均呈逐渐增加趋势。在WOS数据库,我国发文量在全球国家中排名第4,中国科学院在全球机构排名第2;我国学者发文量以王德利、侯扶江等较高,且均为近些年(2020~2022年)发表;有关放牧对植物种群影响研究主要发表在Journal of Applied Ecology,Journal of Ecology等生态学领域的期刊。CNKI数据库中,主要发文机构具有地域性,其中内蒙古自治区内的机构在国内占一定优势;相关研究多在《中国草地学报》《草地学报》发表。国际上主要关注植物种群的动态、保护、生长、响应等种群特征指标,而国内聚焦多样性、生态系统、高寒草甸等大范围、系统性的指标。总体而言,我国有关放牧对植物种群影响的发文量较美国总体偏低,虽然近年(2019~2022年)发文量逐渐增加,但发文机构单一,发文期刊分散,研究范围具有局限性。因此,加强地区合作,深化研究层次,形成突破点可能是提升我国在该领域影响力的有效途径。展开更多
湿地植物是湿地生态系统的核心组成部分,为探明湿地植物研究现状与前沿趋势,利用CiteSpace软件对2002年1月~2022年10月Web of Science数据库中湿地植物相关文献进行全面梳理。结果表明:(1)相关研究经历了初步探索阶段-波动发展期-快速...湿地植物是湿地生态系统的核心组成部分,为探明湿地植物研究现状与前沿趋势,利用CiteSpace软件对2002年1月~2022年10月Web of Science数据库中湿地植物相关文献进行全面梳理。结果表明:(1)相关研究经历了初步探索阶段-波动发展期-快速发展期3个阶段。(2)大尺度湿地植物动态监测、湿地植物修复方法的创新、沿海湿地植物对气候变化的响应是当前研究的前沿热点。(3)通过文献共被引的聚类分析得到21个聚类,根据时间将其分为三个阶段,前期主要研究湿地生态环境对湿地植物生长的影响;中期主要探讨湿地植物对湿地生态环境修复的作用;当前主要研究的方向是湿地植物在全球变化背景下的贡献,以及对全球变化的响应机制及其适应策略。(4)从研究力量看,美国与中国的发文量名列前茅。展开更多
为探究植物数据库的研究现状、热点和趋势,以Web of Science(WOS)核心数据集SCI-EXPANDED为数据源,运用Citespace、VOSviewer和Scimago Graphica文献计量软件和Origin数据分析工具,从发文量、作者、国家、机构和关键词等方面,对2004年至...为探究植物数据库的研究现状、热点和趋势,以Web of Science(WOS)核心数据集SCI-EXPANDED为数据源,运用Citespace、VOSviewer和Scimago Graphica文献计量软件和Origin数据分析工具,从发文量、作者、国家、机构和关键词等方面,对2004年至2022年间发表的植物数据库相关文献进行可视化分析。结果表明,该领域发文量在逐步上升,发文量最高的作者是来自中国农业大学的Su Zhen,中国、美国和德国是该领域研究的主要国家,中国科学院、法国国家科学研究中心是该领域的主要研究机构。该领域的高产期刊为Nucleic Acids Research(核酸研究),发文量占比17.09%。热点高频关键词为database、identification、evolution、resource等。根据关键词聚类主题的不同,对植物数据库进行划分:生态数据库、药用植物数据、组学数据库和遗传资源数据库。关键词突现分析结果显示,prediction、expression和diversity等是近三年出现的突现关键词,可被看作植物数据库研究领域的研究新趋势。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 60901081)the National High Technology Development Program of China (Grant No. 2007AA10Z229)
文摘The existing research results of virtual modeling of rice plant, however, is far from perfect compared to that of other crops due to its complex structure and growth process. Techniques to visually simulate the architecture of rice plant and its growth process are presented based on the analysis of the morphological characteristics at different stages. Firstly, the simulations of geometrical shape, the bending status and the structural distortion of rice leaves are conducted. Then, by using an improved model for bending deformation, the curved patterns of panicle axis and various types of panicle branches are generated, and the spatial shape of rice panicle is therefore created. Parametric L-system is employed to generate its topological structures, and finite-state automaton is adopted to describe the development of geometrical structures. Finally, the computer visualization of three-dimensional morphologies of rice plant at both organ and individual levels is achieved. The experimental results showed that the proposed methods of modeling the three-dimensional shapes of organs and simulating the growth of rice plant are feasible and effective, and the generated three-dimensional images are realistic.
文摘This research aims to clarify the significance of incorporating visual stimulation, in the form of foliage plants, into office desktop spaces. The experiments were conducted in a thermal environment with a temperature range that was slightly uncomfortable. The indoor thermal environment evaluation index ETF was used to measure the effects that brain stimulation of foliage plants have on comprehensive thermal senses. We focus on visual stimulation with foliage plants, and quantitatively measure shifts in thermal senses that affect the body. Thermal environment conditions were established with air temperature in three stages (25℃, 28℃ and 31℃) and the atmosphere was kept homogeneous with wall surface temperature equal to air temperature. The visual stimulations consisted of seven types of office desk image: benjamin, pothos, oxycardium, baby tears, moss ball, cacti, and no plant. At around 27℃ to 29℃ ETF, improvements in thermal sensation, as measured by thermal sensation statements, were shown to have resulted from visual stimulation benefits. Also, at around 26℃ to 29℃ ETF, improvements in comfort were shown, due to visual stimulation benefits as well, in subjects’ comfortable-sensation statements. This benefit was significant when a foliage plant’s green coverage ratio came between 0.75% and 4.67%, the range which does not create an overwhelming feeling from the foliage plant.
文摘利用文献计量学及文献可视化软件CiteSpace对国内外植物氮素代谢的研究现状、研究热点和发展趋势进行总结与分析,便于相关研究者了解本领域的研究现状。以2013—2022年Web of Science数据库(WoS)和中国知网数据库(CNKI)中植物氮素代谢研究相关论文为文献来源,对发文量、主要研究力量、文献共被引、关键词进行分析。研究表明,发文量整体呈现逐渐增长的趋势,中国、美国、西班牙、德国和巴西等国家在植物氮素代谢领域的影响力较大,国内外机构发文量较多的是农林类高校及科研单位。氮的吸收利用、氮利用效率、盐胁迫、铵信号的介导和氮代谢相关酶的研究构成了植物氮素代谢的重要基础。近10年国际上植物氮素代谢研究的热点为植物耐受性、氮利用效率、氨同化、参与氮代谢相关酶和蛋白质的生物合成等;国内研究热点主要集中在不同氮素形态对植物品质和产量的影响、植物的氮素利用效率、碳氮代谢等相关方向,此外耐旱性、乙烯是最新研究前沿。今后植物氮素代谢应进一步围绕氮素利用效率这一目标展开研究,对氮肥施用进行长期动态观测,研究定量标准;关注植物碳-氮代谢协同机制;基于多组学技术开展植物氮素代谢的相关基因研究;整合植物氮素代谢调控网络。
文摘草地在维持生物多样性,保护生态环境等方面具有重要意义,但不合理的放牧活动伴随气候因子的扰动可能对草地系统产生不可逆的消极影响。植物种群是构成群落并形成生产力的基本要素,系统地认识放牧对植物种群影响的研究脉络对进一步发挥草地生态系统的生态意义和经济效益具有重要作用。因此,本文基于文献计量学,通过CiteSpace软件对国内外有关放牧对植物种群影响的相关文献进行统计,就发文趋势及分布,研究主题及演变方向,研究特点与不足,未来创新与突破进行探讨。结果表明:1999~2022年国内外发文量随时间均呈逐渐增加趋势。在WOS数据库,我国发文量在全球国家中排名第4,中国科学院在全球机构排名第2;我国学者发文量以王德利、侯扶江等较高,且均为近些年(2020~2022年)发表;有关放牧对植物种群影响研究主要发表在Journal of Applied Ecology,Journal of Ecology等生态学领域的期刊。CNKI数据库中,主要发文机构具有地域性,其中内蒙古自治区内的机构在国内占一定优势;相关研究多在《中国草地学报》《草地学报》发表。国际上主要关注植物种群的动态、保护、生长、响应等种群特征指标,而国内聚焦多样性、生态系统、高寒草甸等大范围、系统性的指标。总体而言,我国有关放牧对植物种群影响的发文量较美国总体偏低,虽然近年(2019~2022年)发文量逐渐增加,但发文机构单一,发文期刊分散,研究范围具有局限性。因此,加强地区合作,深化研究层次,形成突破点可能是提升我国在该领域影响力的有效途径。
文摘湿地植物是湿地生态系统的核心组成部分,为探明湿地植物研究现状与前沿趋势,利用CiteSpace软件对2002年1月~2022年10月Web of Science数据库中湿地植物相关文献进行全面梳理。结果表明:(1)相关研究经历了初步探索阶段-波动发展期-快速发展期3个阶段。(2)大尺度湿地植物动态监测、湿地植物修复方法的创新、沿海湿地植物对气候变化的响应是当前研究的前沿热点。(3)通过文献共被引的聚类分析得到21个聚类,根据时间将其分为三个阶段,前期主要研究湿地生态环境对湿地植物生长的影响;中期主要探讨湿地植物对湿地生态环境修复的作用;当前主要研究的方向是湿地植物在全球变化背景下的贡献,以及对全球变化的响应机制及其适应策略。(4)从研究力量看,美国与中国的发文量名列前茅。
