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湖泊科学  2015 

利用水生植物氮同位素作为人为氮输入太湖的生物指标

DOI: 10.18307/2015.0207

Keywords: 水生植物δ15N,GAM,植物氮的需求,人为氮输入,生物指标

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Abstract:

富营养化是一个全球性的环境问题,需要更准确地评估人为氮输入对水生生态系统的影响.而初级生产者的N同位素已成为一个有用的生物指标.本研究通过测定太湖和太湖周围湖荡水生植物的δ15N,与水体中的环境因子做GAM分析,结果表明δ15N与水体中的铵态氮、正磷酸盐、总氮都有很显著的相关性,而这主要是由于植物在吸收和同化过程中有较大的同位素效应.水生植物的氮同位素值与氮的有效性和植物对氮的需求有关.当氮浓度有限时,植物对氮的需求变大并且减少了15N的分馏,水生植物则有较高的同位素值,而高氮浓度下,氮的可用性超过植物对氮的需求,15N分馏增大则氮同位素值较低.无锡地区和吴江地区湖荡水生植物同位素值有显著的差异性,无锡地区湖荡湿地富营养化最严重,所以水生植物的δ15N值比吴江地区高.总体来说,水生植物氮同位素可以作为评价生态系统人为氮输入影响的一个有效且简单的生物指标.

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