不同浓度葡萄糖添加对黑土氨基酸转化的影响

通过室内培养方式,研究不同浓度葡萄糖与无机氮肥(NH4)2SO4配施对土壤微生物将无机态氮转化为氨基酸态氮过程的影响。结果表明:和单施(NH4)2SO4培养相比,葡萄糖与(NH4)2SO4配合施用显著提高了土壤微生物将无机态氮向氨基酸态氮转化的程度,高浓度葡萄糖的添加更有利于无机态氮的同化。同样培养条件下NH4+-N、NO3--N和微生物量氮的数据表明,添加碳源明显降低了土壤中NH4+-N和NO3--N的含量,而微生物量氮量明显提高。表明活性碳源的加入明显提高土壤微生物活性,起到调控土壤微生物将无机态N转化为氨基酸态氮速率和容量的作用。

Effect of Different Concentration of Glucose Application on Transformation of Soil Amino Acids

A laboratory soil incubation was conducted to study the influence of different concentration of glucose application on the transformation dynamics from NH4+-N to amino acid-N. The results showed that, compared with incubation with (NH4)2SO4 addition, the transformation capability from inorganic nitrogen to amino acids N by soil microorganisms was enhanced significantly by glucose application and the amount of amino acids transferred from inorganic nitrogen was highly correlated with the concentration of glucose application. Under the same incubation condition, the concentration of NH4+-N and NO3--N decreased apparently, and the content of microbal N increased notablely at the same time. Therefore, the activity of soil micro-organism was enhanced remarkably by glucose application, and the speed and the capacity from the inorganic nitrogen to amino acid N was increased correspondingly. The improved transformation to amino acid-N resulted in the less accumulation of inorganic N, which would decrease the leach loss risk of nitrogen.