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地球学报  2003 

长江中游若干湖泊水生植物体内C、N、P及δ^13C分布

Keywords: 长江中游,水生植物,营养元素,稳定C同位素

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Abstract:

本文就长江中游9个湖泊10种水生植物的C、N、P和稳定C同位素进行了测定,水生植物C元素的平均含量为33.2±5.46%,N、P分别为1.58±0.90%和0.30±0.13%,δ13C组成变化在-27.91‰~-17.16‰之间.从水生植物的生长区域来看,叶子中的C、N和δ13C值与其所处的水环境有密切的关系.对于沉水植物,由于受到无机碳的限制,其叶子中C和N含量显著低于挺水植物及浮水植物;而同时由于水体中无机碳δ13C组成较高,使得沉水植物叶子的δ13C大于挺水植物和浮水植物.

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