KINETIC AND THERMODYNAMIC BEHAVIORS OF SOIL UREASE AS AFFECTED BY UREASE INHIBITORS

文献类型： 外文期刊

第一作者： Juan, Y. H.

作者： Juan, Y. H.;Chen, Z. H.;Chen, L. J.;Wu, Z. J.;Zhang, Y. L.;Juan, Y. H.;Wang, R.;Sun, W. T.

作者机构：

关键词： kinetic parameters;thermodynamic parameters;soil urease;urease inhibitors;temperatures

期刊名称：REVISTA DE LA CIENCIA DEL SUELO Y NUTRICION VEGETAL

ISSN： 0717-635X

年卷期： 2010 年 10 卷 1 期

页码：

收录情况： SCI

摘要： The kinetic characteristics of soil urease have attracted great attention, but little information was available on its kinetic and thermodynamic behaviors as affected by urease inhibitors and temperature. With black soil (Pachic Udic Mollisol) in Heilongjiang Province of Northeast China as a test soil, an incubation test was conducted to investigate the effect of urease inhibitors (hydroquinone, HQ; phenyl phosphorodiamidate, PPD; N-(n-Butyl) thiophosphoric triamide, NBPT) on kinetic and thermodynamic behaviors of soil urease at 10 degrees C, 20 degrees C and 30 degrees C. The results showed that all tested inhibitors increased K(m) and decreased V(max), behaving as mixed inhibitors to soil urease. With increasing temperature, the K(m) and V(max) values increased significantly. With incubation time, K(m) decreased, while V(max) significantly increased. Compared with control, treatment HQ decreased soil urease thermodynamic parameters Ea, Delta H, and Q(10), but in PPD and NBPT treatments, the parameters increased slightly. The Q(10) and Delta H of soil urease decreased slightly with increasing temperature. Among test inhibitors, PPD and NBPT were more effective in influencing the kinetic and thermodynamic behaviors of urease in black soil. The variations in kinetic and thermodynamic parameters indicated that the effects of urease inhibitors on soil urease are greater on kinetic behaviors rather than on thermodynamic ones.

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