在植物生活史中,种子扩散和种子休眠是物种为提高种子萌发率而进化出的生存策略,在时间和空间上规避从种子萌发到幼苗建成所遇到的风险,种子扩散与休眠之间的关系对于理解物种响应不同环境胁迫的进化选择具有重要理论意义.本研究从Web of Science核心合集中检索到1017篇1999-2022年期间发表的关于种子扩散与休眠等生活史策略的文献,运用文献计量学工具CiteSpace 6.2.R1和R软件的"bib-liometrix"程序包提取样本文献数据,利用可视化手段展示了该领域年度发文量、发文国家、发文作者、关键词趋势等信息.根据对样本文献的统计分析发现:1)种子扩散与种子休眠之间显著负相关,显著性程度随环境和组织层次的变化表现出差异;2)某些荒漠植物为适应极端环境,进化出两种或两种以上形态的种子,不同形态的种子分别对应不同的扩散能力和休眠水平的组合,以提高种子扩散后的成活率,扩大种群范围;3)休眠使种子在扩散过程中保持活性,所以最佳扩散距离与休眠水平的权衡是物种繁殖策略领域探究的重要问题之一;4)种子的休眠和扩散特性及其他生活史策略具有协同进化特征,种子扩散与休眠之间的关系还受到环境温度、降雨量、种子数量和大小等因子的影响.种子休眠和扩散策略的进化目标均在于帮助物种应对生存环境的不可预测性,提高适合度,保持物种的更新繁衍能力.理解植物种子休眠与扩散的关系有赖于对植物生活史对策的联合探究.
Bibliometrics and research progress in the relationship between seed dispersal and dormancy
In plant life history,seed dispersal and seed dormancy are survival strategies to improve seed germina-tion rate,which can avoid the risks from seed germination to seedling establishment in time and space.The relation-ship between seed dispersal and dormancy is crucial for understanding plant adaption to environmental stresses.In this study,1017 articles published from 1999 to 2022 were retrieved from the Web of Science Core Collection on the topic of"seed dispersal"or"seed dormancy".The literature data were extracted by using the bibliometrix package of the bibliometric tool CiteSpace 6.2.R1 and R software.The statistic information was visualized for annual number of publications,countries of published articles,authors,and keywords.Based on literature review,we found that:(1)There was a significant negative correlation between seed dispersal and seed dormancy,and the degree of significance varied with environmental changes and tissue level;(2)In adapting to the extreme environ-ment,some desert plants have evolved two or more forms of seeds,corresponding to different combinations of dis-persal capacity and dormancy level,so as to improve the survival rate of seeds after dispersal and to expand popula-tion range;(3)Dormancy keeps seeds alive during the dispersal process,so the trade-off between the optimal dis-persal distance and the dormancy level is one of the main issues about species regeneration strategies;(4)The dor-mancy and dispersal characteristics of seeds coevolved with other life history strategies,and the relationship between seed dispersal and dormancy is affected by environmental temperature,rainfall,number and size of seeds.The evo-lutionary goal of seed dormancy and dispersal strategies is to help species cope with the unpredictability of their liv-ing environment,improve fitness,and maintain the ability of species to regenerate and reproduce.Understanding the relationship between plant seed dormancy and dispersal depends on the joint exploration of plant life history strategies.
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