Factors affecting potassium fixation in seven soils under 15-year long-term fertilization

文献类型： 外文期刊

第一作者： Zhang HuiMin

作者： Zhang HuiMin;Xu MingGang;Zhang WenJu;Zhang HuiMin;He XinHua;Zhang HuiMin

作者机构：

关键词： effect factor;long-term fertilization;potassium (K) fixation capacity;K fixation rate

期刊名称：CHINESE SCIENCE BULLETIN （ 影响因子：1.649； 五年影响因子：1.738 ）

ISSN： 1001-6538

年卷期： 2009 年 54 卷 10 期

页码：

收录情况： SCI

摘要： Potassium (K) fixation by seven soils, including black soil, fluvo-aquic soil, grey desert soil, loess soil, paddy soil, red soil and purple soil, was determined by laboratory simulation under a fifteen-year-period of long-term fertilization. Factors affecting soil K fixation were then discussed by factor analysis and stepwise regression. Magnitude of soil K fixation rate was as follows: the black soil > the purple soil > the loess soil > the fluvo-aquic soil > the paddy soil > the grey desert soil > the red soil. Our results showed that soil K fixation capacity was significantly affected by the clay mineral types in the soils. Potassium fixation capacity of soils, whose 2:1 layer silicates were dominant minerals, was affected by two components extracted by the method of principal component analysis: the first including soil available K, slow available K and K(+) saturation, and the second including cation exchange capacity (CEC), soil organic matter (SOM) and < 0.002 mm clay contents. Potassium fixation rate was mainly affected by K(+) saturation and CEC with lower added K concentration (from 0.4 to 1.6 g/L), and by K(+) saturation and < 0.002 mm clay content with higher added K concentration (from 2.4 to 4.0 g/L).

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