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浑善达克沙地榆种子扩散及成苗影响因素分析

, PP. 542-547

Keywords: 沙地,沙地榆(Ulmus,pumila,var.,sabulosa),种子,扩散,幼苗,浑善达克,内蒙古

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Abstract:

以浑善达克沙地榆为研究对象,以种子扩散规律及成苗率为主要研究内容,采用样线法调查了平沙地、沙丘迎风坡、丘间草地、稀疏灌木地、灌木地5种不同地表类型下沙地榆种子数量。分析种子分布数量与母树距离、地表状况、植被种类、盖度和高度及成苗率与土壤含水率的关系。结果证明影响种子分布数量的主要因子是母树的距离,其他因子对沙地榆种子分布没有显著影响。影响种子萌发成苗的主要因子是6~8月的降水量以及由此导致的沙层含水率,其他因子影响不显著。

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