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OALib Journal期刊
ISSN: 2333-9721
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冻融交替对高寒草甸土壤微生物量氮和有机氮组分的影响
DOI: 10.3724/SP.J.1145.2011.00057, PP. 57-62
Keywords: 冻融交替,微生物量氮,有机氮,氨基酸氮,氨基糖氮,氨态氮,酸解未知氮,高寒草甸土壤
Abstract:
采用bremner氮素分级方法，研究冻融交替对高寒草甸土壤微生物量氮和有机氮组分的影响.结果表明：随着冻融时间的变化，微生物量氮含量先减少后增加，在冻融1d后达到最小值，4℃、-4℃、-4~4℃和-20~4℃处理下分别下降了50.37%、57.47%、37.79%和37.51%；氨基酸氮和氨基糖氮变化趋势相同，先增加后减少，均在冻融1d后达到最大值，各处理氨基酸氮含量分别为处理前的1.6倍、1.47倍、1.44倍和1.5倍，氨基糖分别为处理前的1.66倍、1.58倍、1.65倍和1.91倍；氨态氮含量先增加后减少，-20~4℃处理在冻融1d后为处理前的1.25倍，其余3个处理在冻融3d后达到最大值；各处理酸解未知氮的变化趋势大体相同，在冻融25d后达到最小值.研究表明冻融时间对微生物量氮和有机氮组分影响显著，微生物量氮含量是有机氮组分变化的主要原因.图3表1参24
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