典型沙生植物乌丹蒿的沙生适应机制——植冠种子库和粘液繁殖体  

Adaptation Mechanisms of Typical Psammophyte Artemisia wudanica on Sand Dune——Canopy Seed Bank and Myxospermy

作　　者：马君玲[1] 

机构地区：[1]大连交通大学环境与化学工程学院,辽宁大连116028

出　　处：《中国农学通报》2014年第7期1-4,共4页Chinese Agricultural Science Bulletin

基　　金：国家自然科学基金项目"植冠种子库在铁路沿线沙区段植被恢复中的生态功能研究"(41201562);辽宁省教育厅科学研究一般项目"植冠种子库在辽西北铁路沿线沙区段植被恢复中的生态功能研究"(L2013175)

摘　　要：为了阐明植冠种子库结合粘液繁殖体对典型沙生植物乌丹蒿在种群繁衍过程中适应沙丘流动性的生态功能,笔者总结了以往对乌丹蒿植冠种子库和粘液繁殖体特性的研究,分析了乌丹蒿的植冠种子库延迟脱落种子特性、对种子库、种子萌发和幼苗出土的调节作用、粘液繁殖体的粘液促进种子抗远距离传播能力及对种子萌发和幼苗发育的作用。结果表明,乌丹蒿同时通过植冠种子库和粘液繁殖体来保证母株周围种子的持续供应和幼苗的集群形成。植冠种子库和粘液繁殖体通过调节繁殖体传播、种子库格局、种子萌发和幼苗出土来减缓风蚀沙埋、季节性干旱对种子供应和幼苗生成造成的不良影响,提高沙生植物补员和定居的成功率。2种机制在乌丹蒿种群繁衍过程中的作用对揭示沙生植物的适应机制、恢复沙丘植被和保护沙丘植物多样性具有重要的理论和实践意义。In order to expound the ecological function of two mechanisms in colonization of Artemisia wudanica on the active dune, the author summarized the previous study of typical psammophyte A.wudanica on the influences of canopy seed bank on seed bank pattern, germination and seedling emergence, and the effects of seed mucilage on seed dispersal and germination. The results showed that, canopy seed bank and myxospermy contributed seeds gradually and facilitated aggregated distribution of seedling around the mother plant of A.wudanica. Canopy seed bank and myxospermy function to adjust seed dispersal, seed bank pattern and timing of seed germination and seedling emergence to alleviate the impacts of erosion and sand burial, seasonal drought on seed availability and seedling recruitment, making establishment of psammophytes easier. It had some implications in the vegetation restoration and plant diversity conservation in the sand dune field.

关 键 词：沙丘 种子库 种子萌发 种群繁衍 

分 类 号：Q948.1[生物学—植物学]