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湖泊科学  2011 

苦草(Vallisnerianatans)生长期对沉积物磷形态及迁移的影响

DOI: 10.18307/2011.0513

Keywords: 沉积物,形态磷,苦草

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Abstract:

模拟湖泊系统构建了"沉积物-水-苦草"(Vallisnerianatans)系统,研究了在苦草生长期沉积物、水和苦草三相中磷含量的变化.结果表明:苦草在生长期,能显著降低沉积物中各形态磷的含量,沉积物总磷(TP)、NaOH提取磷(NaOH-P)、HCl提取磷(HCl-P)、无机磷(IP)和有机磷(OP)含量分别降低了65.71、39.06、11.65、52.86和11.28mg/kg.苦草对沉积物磷中IP的吸收效率要大于OP,对NaOH-P的吸收效率要大于HCl-P.水中总磷浓度下降至0.04mg/L.沉积物中氧化还原电位(Eh)显著升高,而pH呈下降趋势.沉积物TP、NaOH-P、HCl-P、IP和OP之间呈极显著正相关,沉积物各形态磷含量与Eh呈不同程度的负相关,与pH呈显著正相关,与苦草根系表面积呈显著负相关.实验结束时,苦草富集的磷为292.24mg,沉积物、苦草和水中磷总量百分比分别为92.04%,7.85%和0.12%.实验结果表明:苦草在生长期通过对沉积物Eh升高和pH降低的方式影响沉积物中磷的含量,将沉积物和水中磷聚集于植物体内,以降低沉积物磷向上覆水释放的风险.苦草对沉积物各形态磷的吸收率排序为NaOH-P>HCl-P;IP>OP。

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