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青萍(Lemna minor L.)对氮磷的吸收特征

Keywords: 青萍,硝态氮,磷酸盐,吸收

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Abstract:

以西部地区优势浮萍品种青萍为实验对象,研究了青萍对不同浓度硝态氮和磷酸盐的吸收特征。结果表明,硝态氮浓度在1~10mg/L范围内,青萍对硝态氮有较好的吸收效果,M-M方程可以较好地描述硝态氮浓度与青萍对硝态氮的吸收速率之间的关系,通过M-M方程拟合得到青萍对硝态氮的最大吸收速率为0.1167mg/(gFW·h),亲和力常数为6.9274。磷酸盐浓度在0.1~1.0mg/L范围内,青萍对磷酸盐也有较好的吸收效果,二次多项式回归可以较好地描述青萍吸收速率与磷酸盐浓度的关系,回归方程得到青萍对磷酸盐的最大吸收速率为0.0193mg/(gFW·h),对应磷酸盐浓度为0.6mg/L。

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