土壤预处理对土壤氮素组分的影响

Effects of Pretreatment of Soil Samples on Nitrogen Fractions

运用室内模拟培养的方法研究了土壤预处理过程对土壤氮素组分的影响。结果表明 :随着处理温度的升高 ,土壤铵态氮的数量有所增加 ;而对土壤硝态氮的数量影响不大 ;土壤可溶性有机态氮的数量有增加的趋势 ,其中 10 5℃处理后的土壤可溶性有机态氮的数量明显高于鲜土、风干土和 40℃处理的土样 ,10 5℃处理后的土壤可溶性有机态氮除了大部分来自土壤微生物态氮的降解产物之外 。

The effect of pretreating soil samples (field fresh, fumigated with CHCl 3, drying at room temperature,40℃ and 105℃) on extractable nitrogen fractions, especially on soluble nitrogen (N org ) was studied The results showed that the treatment had little effect on NO 3 --N contents, but a significant effect on NH 4 +-N and N org contents when the drying temperature increased The N org contents of samples dryed at 105℃ was highest among the samples of field fresh,fumigated with CHCl 3, dried at room temperature,40℃ and 105℃, which came from not only a part of the microbial biomass nitrogen, but also from the decays of large organic molecules of soil nitrogen constituents