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通过对陕西 7种类型 1 9个土样脲酶活性与底物浓度关系的研究 ,表明 Y=a× b×x/ ( 1 + b×x)模型能较好地表征二者的关系 ,并得到了最大表观脲酶活性 Umax,同时揭示出酶促反应存在着吸附机制 ;除水稻土和黄褐土外 ,其余土样的 Umax值均呈现高肥力大于低肥力的规律性变化 ,相关分析发现在不同生态区中土壤脲酶特征截然不同 ,其 Umax值有明显差异 ,故在分析时需区分开来 ;只有同一生态区中土壤脲酶的 Umax与肥力密切相关 ,可作为土壤肥力指标之一。
Through the study of the relationship between the soil urease activity and substrate concentration of seven types of soil samples from seven types in Shaanxi Province, it is shown that the Y = a × b × x / (1 + b × x) model can well characterize the relationship between the two and obtain The maximum apparent urease activity Umax, at the same time revealing that the enzymatic reaction exists adsorption mechanism; except for paddy soil and yellow cinnamon soil, the Umax values of other soil samples showed a regular pattern of high fertility and low fertility. Correlation analysis showed that at Soil urease characteristics in different ecotopes are very different, and their Umax values are obviously different. Therefore, the Umax values of soil urease in the same ecotope are closely related to soil fertility and can be used as one of the index of soil fertility.