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沙丘区植物植冠储藏种子的活力和萌发特征

马君玲1,2;刘志民1   

  1. 1中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院研究生院, 北京 100039
  • 收稿日期:2007-04-11 修回日期:1900-01-01 出版日期:2008-02-21 发布日期:2008-02-21

Viability and germination characteristics of canopy-stored seeds of plants in sand dune area.

MA Jun-ling1,2; LIU Zhi-min1   

  1. 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100039, China

  • Received:2007-04-11 Revised:1900-01-01 Online:2008-02-21 Published:2008-02-21

摘要: 研究了科尔沁沙地10种植物的植冠储藏(成熟后在植冠中保留至翌年5月)种子的活力及萌发特性.结果表明:典型沙生植物(流动沙丘及半固定沙丘植物)沙蓬、乌丹蒿和差巴嘎蒿的植冠储藏种子80%以上具有活力,而非典型沙生植物的植冠储藏种子有活力的不足80%,甚至在30%以下;典型沙生植物的植冠储藏种子表现出“速萌型”的萌发特征.植冠种子库使典型沙生植物种子的脱落延迟到风季结束、雨季来临的时候,而且此时的种子活力较高、萌发迅速.植冠种子库是典型沙生植物适应流沙和季节性干旱的主要方式之一.

关键词: 幼苗幼树, 地径-树高模型, 更新, 天然阔叶林, 混合效应

Abstract: The study on the viability and germination characteristics of canopy-stored seeds remained in canopy until next May after maturation of 10 plants species in Horqin sandy land showed that more than 80% of the canopystored seeds of psammophytes such as Agriophyllum squarrosum, Artemisia wudanica and A. halodendron had viability, while less than 80% or even less than 30% of nonpsammophytes seeds had viability. The canopystored seeds of psammophytes presented a rapid germination pattern. The canopy seed bank made the seed release of psammophytes postponed until the windy season ended and the rainy season started, when the seeds had high viability and could germinate rapidly. The canopy seed bank is one of ways for psammophytes to adapt drift sand and seasonal drought.

Key words: seedling and sapling, ground diameter-tree height model, regeneration, natural broad-leaved forest, mixed effect