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北方园艺  2014 

不同水分梯度对激发土壤种子库的效应研究

, PP. 181-185

Keywords: 荒漠草原,水分,土壤种子库

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Abstract:

采用水分控制试验,对干旱、半干旱退化荒漠草原治理过程中,土壤种子库对不同日降雨量和不同年降雨量的响应分别进行了研究。结果表明不同日降雨量对激发土壤种子库物种组成和种子萌发总数均存在显著差异;不同植物种子对自身种子萌发所需水分不同。有的植物仅需很少水分即可萌发,有的植物需要很多的水分才可萌发,还有的植物种子可萌发范围较广;不同年降雨量对激发研究区内土壤种子库物种组成差异不显著,而对激发土壤种子库内可萌发种子数则成波动式的变化。为治理退化荒漠草原、恢复地上植被,建议研究区采用交替施加不同梯度的水分来激发土壤种子库中的种子萌发。

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