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不同氮源及秸秆添加对菜地土壤N_2O排放影响

文献类型: 中文期刊

作者: 姜宁宁 1 ; 李玉娥 2 ; 华珞 2 ; 万运帆 2 ; 石生伟 2 ;

作者机构: 1.中国农业科学院农业环境与可持续发展研究所

2.中国农业科学院农业环境与可持续发展研究所;首都师范大学资源环境与旅游学院

关键词: 设施菜地土壤;N2O;培养;氮肥种类;秸秆

期刊名称: 土壤通报

ISSN: 0564-3945

年卷期: 2012 年 43 卷 01 期

页码: 219-223

收录情况: 北大核心 ; CSCD

摘要: 在饱和田间持水量WFPS(water-filled pore space)为75%、温度为25℃的条件下,用室内培养研究设施菜地土壤在不同氮肥种类(硝酸钙CN,碳酸氢铵AB,硫酸铵AS,尿素U,对照CK)和有无秸秆添加情况下N2O的排放特征。培养17天的结果表明,各种肥料类型中,对照和硝态氮肥处理最先出现N2O排放高峰,铵态氮肥处理出现较晚。无论有无秸秆,碳酸氢铵(AB)处理的累积排放量都最高,分别为4.206±0.899和2.159±0.256μg g-1干土,铵态氮肥处理N2O排放量明显高于硝态氮肥。添加秸秆后各处理N2O排放明显增加,比未施秸秆增加1倍多(CN处理除外)。不同处理(CK除外)的N2O累积排放量与时间的关系都可用y=aLn(x)+b表示(P<0.001)。实验还发现,施用氮肥会导致土壤酸化,添加秸秆可改善土壤酸化现象。

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