前期不同水分状况对土壤氧化亚氮排放的影响

被引：9

作者：

王连峰 ^{[1
,2
]}

蔡祖聪 ^{[1
]}

机构：

[1] 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所)

[2] 不详

来源：

土壤学报 | 2009年 / 46卷 / 05期

关键词：

氧化亚氮; 水分前处理; 异养硝化作用;

D O I：

暂无

中图分类号：

S153 [土壤化学、土壤物理化学];

学科分类号：

摘要：

田间采集的新鲜土壤样品分别在室温下风干(土样D)和淹水(土样S)保存110d后,将二者的含水量分别调至20%、40%、60%、80%、100%持水量(WHC,Water Holding Capacity),在25℃下培育138h,设置不通和通入10%(v/v)乙炔的处理。结果显示,在20%～80%WHC下培育时,土样S的氧化亚氮(N2O)排放量为土样D的2.48倍～6.36倍(p<0.01),而在100%WHC水分含量下培育时,土样S的N2O排放量仅为土样D的19%(p<0.01),通入乙炔不但未使土样D的N2O排放量增加,反而显著减少。通入乙炔的处理,培养结束后硝态氮的含量增加。随培育水分含量的升高,土样S和土样D的二氧化碳排放量增大。供试土样可能存在异养硝化作用。前期水分的差异显著影响土壤N2O排放量,故在田间测定土壤N2O排放量时,要考虑土壤前期水分的差异。

引用

页码：802 / 808

页数：7

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