土壤微生物体氮与可矿化氮关系的研究

Study on Relationship Between Soil Biaomass Nitrogen and Mineralisable Nitrogen

同时应用大田试验和室内培养试验研究土壤微生物体氮与可矿化氮之间的相关性。试验结果表明,田间条件下,土壤微生物体氮与可矿化氮之间的关系不密切,但在培养试验中,微生物体氮与淹水培养法、硝化培养法和Stanford短期淋洗通气法测定的可矿化氮间有显著的线性关系,相关系数在0.767(p<0.01,n=12)以上。田间试验结果和室内培养试验结果的不一致性,与试验条件的差异有关。新形成的微生物体氮易降解,而原有土壤微生物体氮却相对稳定。

The correlation relationship between soil biaomass nitrogen and mineralisable nitrogen was studied with field experiment and incubation experiments. The result showed： that correlation relationship between soil biaomass nitrogen and mineralisable nitrogen had weak correlation relation under field conditions; but there was significant linear correlation relationship between soil biaomass nitrogen and mineralisable nitrogen under waterlogged incubation conditions, nitrify incubation method and Standford short-term incubation method, and the correlation coefficients were over 0. 767 （p 〈 0. 001, n = 12）. The difference of results between field experiment and incubation experiments was relative with the difference between experiment conditions. The newly soil biaomass nitrogen was easily decomposable, but the old one was stable relatively.