摘要
基于调查、实验和文献资料 ,作者探讨了沙地柏 (Sabinavulgaris)种群的繁殖特征和更新特征。 1)根原基是沙地柏进行营养繁殖的结构基础 ,由根原基发育而成的不定根能够吸收充足的土壤资源供给萌生苗需要 ,因此定居的萌生苗能够独立维持。 2 )沙地柏同时具有营养繁殖和有性繁殖 ,因而沙地柏种群可通过无性更新和有性更新实现维持。 3)种子质量极差、萌发率低和实生苗存活率低是制约沙地柏种群有性更新的 3个“瓶颈”。 4)沙地柏的营养繁殖力强、萌生苗存活率高、繁殖体的产生途径多样 ,这使自然条件下沙地柏种群以无性更新为主。
Based on the investigation and related literature, the reproduction and regeneration of Sabina vulgaris populations were examined. 1) Root primordia were the most fundamental structure for vegetative propagation; advantitious roots deriving from root primordia could take in enough soil resources to meet the need of metabolism in sprouting young plants, and the established sprouting young plants could maintain independently. 2) The species simultaneously had vegetative propagation and sexual reproduction, which benefits the species to make better use of advantages of the two types of reproduction, and which provides two means of regeneration to the species. 3) Very poor seed quality, very low seed germination and very low seedling survival were three 'bottle-necks' restricting sexual regeneration of S. vulgaris populations. 4) Asexual regeneration of S. vulgaris populations dominated in natural conditions owing to higher capacity to propagate vegetatively, higher survival of sprouting plants, and diverse means to produce vegetative propagator.
出处
《植物生态学报》
CAS
CSCD
北大核心
2002年第2期235-238,共4页
Chinese Journal of Plant Ecology
基金
中国科学院资源与生态环境研究重大项目 (KZ95 1_B1_10 8)
关键词
毛乌素沙地
沙地柏
营养繁殖
有性繁殖
无性更新
有性更新
种群更新
Mu Us Sandland, Sabina vulgaris, Vegetative propagation, Sexual reproduction, Asexual regeneration, Sexual regeneration
