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以长白山阔叶红松林暗棕色森林土为研究对象,研究不同形态氮(N)添加对土壤不同粒级团聚体CO2和N2O排放的影响。采用室内短期培养试验(15 d),研究对照(CK)、氯化铵(NH4Cl,含N 150 mg kg-1)和硝酸钠(Na NO3,含N 150 mg kg-1)添加对全土(bulk soil)、大团聚体(250~1000μm)、微团聚体(53~250μm)、粉粒+黏粒(<53μm)土壤组分CO2和N2O排放的影响。结果表明:CO2的排放量为大团聚体>微团聚体>全土>粉粒+黏粒;NH4+-N添加对全土和各粒级团聚体的CO2排放没有显著影响;NO3--N添加对大团聚体和微团聚体的CO2排放有促进作用,并且在微团聚体中影响显著(P<0.05),但对全土和粉粒+黏粒的CO2排放影响不显著。不同形态N添加对全土和各粒级团聚体N2O排放影响不同,NO3--N添加显著促进了N2O的排放,NO3--N添加后N2O排放量为全土>大团聚体>微团聚体>粉粒+黏粒;NH4+-N的添加抑制了N2O的排放,NH4+-N添加后的土壤大团聚体、微团聚体和粉粒+黏粒的N2O排放量间无显著差异。由此可见,不同形态N添加影响土壤组分的CO2和N2O排放,且作用效果不一。
The study was conducted on the dark brown forest soil in the broad-leaved Korean pine forest in Changbai Mountain to study the effects of different forms of nitrogen (N) on CO2 and N2O emissions from different size fractions of soils. The effects of CK, NH4Cl (containing 150 mg kg-1 N) and NaNO3 (containing 150 mg kg-1 N) on growth of whole soil soil, large aggregates (250 ~ 1000μm), microaggregates (53 ~ 250μm), silt + clay (<53μm) The results showed that: the amount of CO2 emission was large aggregates> microaggregates> total soil> silt + clay; NH4 + -N addition had no significant effect on CO2 emission of the whole soil and each size fractions; NO3 - N added to large Aggregates and microaggregates promoted CO2 emission and had a significant effect on microaggregates (P <0.05), but had no significant effect on CO2 emission from whole soil and silt + clay. Different forms of N had different effects on the N2O emission of the whole soil and each size fractions of aggregates. NO3 - N addition significantly promoted the emission of N2O. N2O emission after NO3 - N addition was all soil> macroaggregate> microaggregate> The results showed that there was no significant difference in N2O emission of soil aggregates, microaggregates and silt + clay after addition of NH4 + -N. Thus, different forms of N added to affect soil components of CO2 and N2O emissions, and the effect is different.