数字农科院2.0

保护地土壤N_2O排放通量特征研究

文献类型： 中文期刊

作者： 武其甫;武雪萍;李银坤;吴会军;闫鹏

作者机构：

关键词： N2O;保护地菜地土壤;氮肥;灌溉

期刊名称：植物营养与肥料学报

ISSN： 1008-505X

年卷期： 2011 年 17 卷 04 期

页码： 942-948

收录情况： 北大核心 ; CSCD

摘要： 为研究保护地土壤N2O排放通量特征,于2009年8~12月,在河北辛集不施氮(N0)、当地习惯施氮(N900)及减量施氮(N675)处理下的秋冬季番茄保护地土壤上使用静态箱采集、气相色谱仪检测的方法测定了土壤N2O排放通量。得到以下研究结果:灌溉施肥后,各处理N2O平均排放通量与表层土壤硝态氮含量呈极显著正相关关系。灌溉施肥后7 d内是施氮处理土壤N2O主要排放期,其排放量占当季总排放量的55.9%~59.8%;高峰值一般出现在第3~5 d,此时的土壤含水量对硝化、反硝化作用都较适宜。8~10月份由于温度较高,N2O排放通量明显高于较冷的11~12月。8~10月份施氮是影响保护地土壤N2O排放的主导因素,减少施氮量显著降低了N2O排放量;之后温度是主导因素,此时N2O排放量受追施氮量的影响较小。经估算,保护地秋冬季番茄不同施氮处理N2O总排放量的大小顺序为N900(N 5.304 kg/hm2)>N675(N 3.616 kg/hm2)>N0(N 0.563 kg/hm2),差异显著,N675比N900处理降低了31.8%的N2O排放量;N675和N900处理的N2O排放系数分别为0.45和0.53。

分类号： S153

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