种子发芽生态研究  

Research on Seed Germination Ecology

作　　者：张红香[1] 周道玮[2] 

机构地区：[1]中国科学院植物研究所植被数量生态学重点实验室 [2]中国科学院东北地理与农业生态研究所,长春130020

出　　处：《草地学报》2009年第1期131-133,共3页Acta Agrestia Sinica

基　　金：国家"973"项目(2007CB106801)

摘　　要：生活史策略是植物种群生态研究的重要领域，而种子发芽是植物生活史的重要阶段，因此，研究种子发芽规律及对策，有助于认识和阐明物种进化及其生态适应特征。本论文以松嫩草原区植物为对象，主要研究种子对恒温和变温的发芽响应，比较变温梯度模拟的全球增温对C3、C4植物种子发芽的影响，研究植物发芽模式及在不同温度条件下的变化，探讨植物对盐、水势变化及盐与温度交互作用的发芽响应机制。Life history strategy is an important research area of plant population ecology and seed germination is the critical stage of plant life history.Therefore,researches on seed germination rule and strategy help to know and elucidate the evolution and ecological adaptation traits of plant species.Plants in Songnen grassland area were treated as the target to investigate the seed germination responses to constant temperature and diurnal increasing or decreasing temperature,the effect of global warming simulated by alternating temperature regimes on seed germination of C3 and C4 species,and the germination patterns and their dynamics under different temperatures.The germination response mechanisms of plants to NaCl and PEG and their interaction were also studied.Based on the results of constant temperature effect,we proposed the modified thermal time model according to the basis of thermal time model and recruited an equation describing the constant germination rate.Germination rate of C3 species was obviously lower than that of C4 species.According to thermal time model,the average base germination temperature of C3 species was lower than that of C4 species,but not significantly.The average thermal time constant of C3 species was higher than that of C4 species and the difference approached to significant level.In this study,plant seed germination pattern was divided into five categories： quick germination,delayed germination,steady germination,normal germination,and delayed-quick germination.Most annual species belonged to the quick germination pattern,while the perennial C3 species in meadow belonged to the delayed-quick germination pattern,normal germination pattern,or steady germination pattern.Being an adaptive strategy to environments,the seed germination pattern of most species changed along with different temperatures.Under global warming conditions simulated by alternating temperature regime,the germination traits of C3 and C4 species changed.C3 species was sensitive to high temperature and C4 species sensi

关 键 词：种子 发芽 温度 积温模型 盐 渗透效应 离子效应 

分 类 号：Q948.1[生物学—植物学]