Illite transformation and potassium release upon changes in composition of the rhizophere soil solution
Illite transformation and potassium release upon changes in composition of the rhizophere soil solution
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DOI：
10.1007/s11104-013-1680-6
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发表时间：
2013-10-01
期刊：
影响因子：
4.9
通讯作者：
Jahn, Reinhold
中科院分区：
文献类型：
--
作者：
Vetterlein, Doris;Kuehn, Thomas;Jahn, Reinhold
伊利石层间“不可交换”钾 (K) 的释放是扩散控制的，并且已被证明取决于 K 和其他阳离子（Ca2+、Mg2+、NH4 (+)）的溶液浓度。我们分析了距离根表面不同距离处原位土壤溶液中 K 和竞争阳离子浓度随时间的变化，并将其与伊利石的转化相关联，如 X 射线衍射和不同结合 K 的化学测量所示。 49 天和 98 天，伊利石总钾的 6.4% 和 14.4% 在与根系接触时被释放。混合层状矿物从 33 (0 d) 增加到 35 (49 d) 到 40 % (98 d)。当土壤溶液钾浓度接近先前提出的阈值 80 μM 时，钾从夹层释放和伊利石转化发生。 Ca 和 Mg 的浓度随着距根表面距离的减小而增加，促进 K 的释放。NaBPh4 方法被认为是确定“不可交换”K，但从伊利石中仅提取了总 K 的 1/3。
Release of 'non-exchangeable' potassium (K) from interlayers of illite is diffusion-controlled and has been shown to depend on the solution concentration of K and other cations (Ca2+, Mg2+, NH4 (+)).We analysed changes in soil solution concentrations of K and competing cations in situ at different distances from the root surface over time and related them to the transformation of illite, as revealed by X-ray diffraction, and chemical measures of differently bound K.Within 49 and 98 days, respectively, 6.4 and 14.4 % of the illite's total K was released upon contact with the root system. Mixed layered minerals increased from 33 (0 d) to 35 (49 d) to 40 % (98 d). Release of K from interlayers and the transformation of illite occurred at soil solution K concentrations close to the threshold of 80 mu M suggested earlier. Concentrations of Ca and Mg increased with decreasing distance from the root surface, promoting the release of K. The NaBPh4 method supposed to determine 'non-exchangeable' K extracted only 1/3 of the total K from illite.