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-  2015 

滇池流域宝象河水库沉积物中有机碳的来源

DOI: 10.11821/dlyj201501005

Keywords: TOC,TN,C/N,δ13C,粒径,宝象河流域

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Abstract:

摘要: 通过对滇池流域宝象河水库沉积物TOC、TN、C/N、δ13C及粒度等指标的测定,分析了沉积物中有机碳的主要来源及其变化趋势。结果表明:水体中不同位置沉积物有机碳来源并不相同,距三岔河入库河口相对较近的沉积柱芯A中C/N比值介于2.93~11.73,δ13C值介于 -23.66‰~-21.78‰,有机碳主要来源于水生生物,陆源输入贡献较小,有机碳含量受粒径大小影响显著;距三岔河入库河口相对较远的沉积柱芯B中,其TOC和TN含量较高,分别介于14.62~24.93 g?kg-1和2.11~3.3 g?kg-1,δ13C值变化范围为-28.36‰~-26.36‰,粒度以黏土和细粉砂为主,有机碳主要来源于水库周边陆源输入,受人类活动影响强烈。

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