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作 者 ：何念鹏,吴泠,周道玮

期 刊 ：生态学报 2004年 24卷 4期 页码：843~847

关键词：种子流；土壤种子库；种子动态；退化；次生光碱斑；

Keywords:seed movement, soil seed bank, seed dynamics, degradation, secondary bare alkali-saline patch,

摘 要 ：通过陷井法 ,对松嫩草地次生光碱斑的表面种子流、土壤种子库动态进行了分析 ,调查发现次生光碱斑种子流数量巨大 ,种类相当丰富 ;次生光碱斑的表面种子流月份间差异极显著 ,6月份最小 ,10月份最大。次生光碱斑的土壤种子库很小 ,种类单一 ,原有的土壤种子库严重流失 ;与典型羊草群落相比 ,土壤种子库在种类和数量上均有很大差异。次生光碱斑的土壤种子库很小 ,尤其在 5、6月 ,造成次生光碱斑种子极度缺乏 ,是次生光碱斑植物自然恢复进程极其缓慢的重要原因之一。根据种子流的生理 -生态特征和数量特征 ,它对次生光碱斑的植被恢复具有重要意义 ,是潜在种源。

Abstract:Soil seed banks usually play an important role in the vegetation regeneration and succession, and there exists a very close relationship between vegetation dynamics and soil seed bank. Especially for some severely deteriorated ecosystems, soil seed banks are the main available seed source in natural conditions, serving as a template for subsequent successive processes such as germination, competition, growth, and ultimately shaping the stable native communities. Therefore, soil seed bank to some extent can ...

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