塿土固定态NH4+释放动力学的研究
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KINETICS OF FIXED AMMONIUM RELEASE FROM MANURED LOESSIAL SOIL
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    摘要:

    本文采用好气培养-间歇淋洗法研究了塿土耕层土壤固定态NH4+的释放。实验在恒温下共培养20周。结果表明,一级扩散动力学方程描述固定态NH4+的释放最好,其相关系数r最大,标准误SE最小。抛物扩散方程也能较好的描述实验数据,表明固定态NH4+释放是一扩散控制过程,Elovich方程的拟合情况和抛物扩散方程相同,零级方程略差,其SE较大。S11和S12土样固定态NH4+释放速度常数kr分别是0.1097和0.8834/周,最大释放NH4+是分别为98.42和85.25mgN/kg,释放NH4+半时值分别是6.32和7.85周。

    Abstract:

    The kinetics of axed ammonium release from plough layer of manured loessial soil (expressed as S11,)and the soil where organic matter (OM.)was destroyed by oxidation (as S12) in Shaanxi Province of China were investigated using aerobic incubation-intermittent leaching method.The incubation was lasted up to 20 weeks to reach the maximum NH4+ release.The kinetics of fixed NH4+ release were evaluated using the Elovich,parabolic diffusion law,first-order diffusion and zero-order equations.The first-order equation described the NH4+-elease kinetics best as evidenced by the highest correlation coefficient (r) and the lowest valise of the standard error of the estimate (SE).The parabolic diffusion law also described the data satisfactorily,indicating that fixed NH4+ release was a diffusion-controlled process.Although the Elovich equation was also suitable to fit the NH4+-release,the zero-order one was not as good as above ones,as shown by higher SE values than those found with the other equations.fixed NH4+-release rate coefficient (kr) was 0.1097/week and 0.08834/week,and maximum NH4+-release amount 98.42mgN/kg soil and 85.25mgN/kg soil as well as the half time values of NH4+-release (t1/2)6.32 weeks and 7.85 weeks for S11 and S12 respectively.Both nitrification and soil organic matter affected fixed-NH4+ release.

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樊小林,张一平,李玲.塿土固定态NH4+释放动力学的研究[J].土壤学报,1996,33(3):287-292. DOI:10.11766/trxb199504240308 Fan Xiaolin, Zhang Yiping, Li Ling. KINETICS OF FIXED AMMONIUM RELEASE FROM MANURED LOESSIAL SOIL[J]. Acta Pedologica Sinica,1996,33(3):287-292.

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  • 收稿日期:1995-04-24
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  • 在线发布日期: 2013-02-25
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