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东北地区土壤有效硅的时空分异及其对芦苇植硅体形成的影响

, PP. 967-976

Keywords: 植硅体,有效硅,芦苇,土壤,东北地区

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Abstract:

在东北地区按温湿差异选取12个芦苇样点,对其芦苇植硅体、芦苇中有效硅和土壤有效硅进行研究,分析土壤有效硅对植硅体形成的影响,对于植硅体形成机理和古环境重建具有重要意义。结果表明,土壤有效硅含量和植硅体浓度在样点间存在明显差异。在芦苇的不同生长期,土壤有效硅含量差异不明显,芦苇中有效硅含量差异明显。7、8月时,植株吸收的有效硅主要用于植硅体的形成,植硅体浓度较高,且易受到土壤与芦苇有效硅含量比值的影响。9、10月植硅体浓度较低,可能由于成熟期芦苇叶片中硅含量较少而形成较少植硅体。土壤和芦苇有效硅含量的比值约为4时,硅吸收方式可能从主动逐渐转变为被动。此外,芦苇中多数形态的植硅体浓度和土壤与芦苇有效硅含量的比值呈负相关,说明土壤有效硅含量的变化对芦苇植硅体的形成有着一定影响。

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