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贡湖湾北部退渔还湖区水、沉积物和土壤中氮的时空分布

DOI: 10.11654/jaes.2014.11.023, PP. 2234-2241

Keywords: 贡湖,退渔还湖区,水陆交错带,水/沉积物/土壤,,时空分布

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Abstract:

太湖贡湖湾北部退渔还湖区(2.18km2)的水陆交错带,虽已进行了基底改造和小部分植物种植,但仍需开展大规模种植,故迫切需要了解其生境特性的状况,为此开展了该区域的水陆交错带水、沉积物、土壤中氮的时空分布特征调查,以便为后续示范工程的设计提供基本参数。选择南部和北部两处交错带(面积分别为6700、8300m2)及其周边陆域、水域,分别在2012年11月和2013年5月采集17个点位的水、沉积物和土壤样品,分析了其氮的时空分布。结果表明:水、沉积物和土壤样品中的氮存在明显的季节变化,春季水、沉积物和土壤中的总氮和氨氮均低于秋季,而春季沉积物和土壤中硝氮含量较高。人为栽种植物有利于氮的去除,温度和微生物的活动对此也有一定的贡献。在春季,水陆交错区的硝化作用更强烈;氨氮的空间分布与总氮基本一致,水中氮的主要存在形式是氨氮,而沉积物和土壤中的氮以有机氮为主。

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