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作 者 ：何维明,董鸣

期 刊 ：生态学报 2002年 22卷 2期 页码：169~175

关键词：源株；分蘖株；基株；养分异质性；等级性；

Keywords:genet, hierarchy, nutrient heterogeneity, ortet, tiller,

摘 要 ：为揭示 1年生分蘖草本黍对异质养分环境的等级反应 ,比较了 4种异质养分环境中黍分株和基株的生长、繁殖特征。在分株水平 ,异质养分环境显著影响源株高度、叶面积、繁殖分配、千粒重和种子数 ,而对生物量无影响 ;异质养分环境显著影响分蘖株的这 6个指标。在基株水平 ,生物量、分蘖数和种子数随环境中养分总量的提高而逐渐增大 ,根重比恰好相反 ;繁殖分配不受异质养分环境的影响 ;除一种处理外 ,其它 3种环境中的千粒重不受养分状况的影响。这些结果指示 :黍分株和基株对异质养分环境的反应具有等级性 ,源株和分蘖株对相同环境的反应存在差异。

Abstract:Panicum miliaceum is a tillering clonal species with profuse roots, and is widespread in northern China. The species has been regarded as an ideal plant for experiments with nutrient patches due to its rapid growth. Early June 1999, plastic boxes (18cm×18cm ×30cm) were put at the center of paper boxes (42cm×35cm×30cm), and the plastic boxes and the space between the plastic boxes and the paper boxes were fully filled with a mixture of sand and compound fertilizer in various proportions. Each growth containe...

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