【摘要】 研究了不同类型沙地一年生植物长穗虫实的繁殖分配及其与个体大小的关系。结果表明:①不同类型沙地长穗虫实的个体大小、繁殖器官大小、单株种子数以及株高等其他地上部分特征均表现出极显著的差异性,其大小排列顺序为:固定沙地>半固定沙地>流动沙地,即表现出随沙面的固定而逐渐增大的趋势;②不同类型沙地虫实繁殖分配、单株种子重和种子均重也不相同,其差异程度从不显著到极显著不等;③不同类型沙地虫实个体大小与繁殖器官大小均呈极显著的正相关关系,个体大小与繁殖分配在不同类型沙地呈负相关关系,其中在流动沙地和固定沙地上达到显著水平;④个体大小与单株种子数、单株种子重之间存在正相关关系,但流动沙地相关程度较低;⑤不同类型沙地上虫实繁殖分配具体表现为,流动沙地为34.9%,固定沙地和半固定沙地大于50%,即随着沙面固定程度的增加,一年生植物种虫实倾向于将更多的资源和能量用于繁殖生长。这一结论不仅有助于分析该植物对沙生生境的适应对策,也有助于对种群繁殖对策理论问题的深入探讨。更多还原

【Abstract】 In this study,the reproductive allocation and the relationship between plant size and reproductive allocation of the annual natural population of Corispermum elongatum in different sandy habitats was evaluated.The results of the study were as follows:(1) The sizes of the plants,reproductive organs and other growth characteristics of C.elongatum growing in different sandy habitats differed significantly,with the growth characteristics of plants in fixed sand being larger than those of plants growing in semi-fixed sand land and plants in mobile sand land having the smallest characteristics.These findings indicated that the size of the plant growth characteristics increased as the degree of sand fixation increased;(2) The reproductive allocation,seed weight of each plant and average seed weight of C.elongatum growing in different sandy habitats also differed;(3) There is a significant positive correlation between plant size and the size of reproductive organs in C.elongatum growing in different habitats,but a negative correlation between plant size and reproductive allocation,with significant correlations being observed for plants grown in mobile sandy land and fixed sandy land;(4) There is a positive correlation between the average seed weight of each plant,seed number and plant size,but the correlation coefficient is low for plants grown in mobile sandy land;(5) The reproductive allocation in mobile sandy land is only 34.9%,but it is as high as 50% in semi-fixed and fixed sandy land,which indicates that the annual plants convert more resources and energy into their reproduction as the level of sand fixation increases.更多还原