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江苏句容水库农业流域农田土壤反硝化作用的研究

Keywords: 旱地,水田,反硝化速率,氮损失,农业流域

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Abstract:

2008年6月、8月、12月和2009年3月,在江苏句容水库农业流域采集农田原状土壤样品,使用乙炔抑制实验室培养法测定土壤的反硝化速率,同时测定土壤的含水率、铵态氮(NH+4-N)和硝态氮(NO-3-N)的含量,研究农田土壤反硝化速率变化、影响因素及其对流域氮损失的贡献。结果显示,旱地土壤反硝化速率范围在0.13~51.96kgN·hm-2·a-1之间,水田土壤的反硝化速率范围在3.16~12.29kgN·hm-2·a-1之间。相关分析表明,反硝化速率与土壤硝态氮(NO-3-N)浓度、铵态氮(NH+4-N)浓度之间不具有显著相关关系;在12月和3月,反硝化速率与土壤含水率之间有显著相关关系,其他月份无显著相关关系。流域内农田土壤反硝化损失的总氮量为31.93tN·a-1,低于流域施氮总量的3.19%,可见,反硝化作用不是该流域氮损失的主要途径。

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