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作 者 ：李娜 韩晓日 杨劲峰 刘宁 李巧宁 房大伟

期 刊 ：植物营养与肥料学报 2012年 18卷 6期 页码：1413-1418

关键词：长期施肥；棕壤；吸附位点钾；表观平衡；有效性；剖面分布；

Keywords:long-term fertilization, brown soil, K adsorbed by clay minerals, apparent balance,

摘 要 ：运用连续提取法结合常规方法，研究玉米—玉米—大豆轮作条件下，经过31年不同施肥后棕壤矿物吸附的p位钾、 e位钾和i位钾的有效性及其剖面分布情况。结果表明:  耕层土壤各位点钾含量及占全钾比例均表现为i位＞e位＞p位; 长期单施化学钾肥或不施钾各位点钾含量降低，有机肥配施化肥可以维持土壤中各位点钾含量。相关分析表明，交换性钾与p位和e位钾相关性显著，相关系数分别为0.926*和0.886*; 植株地上部吸钾量与p和e位钾呈显著正相关关系，与i位钾呈极显著正相关关系（r=0.963**）; 不同位点间钾含量呈极显著正相关关系。在剖面分布中，p、 e和i位钾含量均表现为0—20 cm＞20—40 cm。

Abstract:The sequential extractions combined with conventional methods were used to study the availability of K adsorbed by clay minerals and the profile distribution under longterm fertilization of brown soil, with a maizemaizesoybean rotation. Results showed that the contents of K and the proportion in total K on arable layer presented as follows:  i＞e＞p. Contents of p, e and i sites K with chemical K fertilizer application and no K fertilizer application decreased. And organic manure with K fertilizer application could remain the amount of K at a higher level. Correlation analysis indicated positive correlation between psite K,  esite K and exchangable K, and the correlation coefficient were 0.926*and 0.886*, respectively. A positive significant correlation was observed between psite K, esite K and the uptake of K by crops. And there was a highly significant correlation between i sites and the uptake of K by crops (r=0.963**). There was an extremely significant positive correlation among psite K, esite K and i site K. The tendency of contents of potassium were all changed with depth as follows:  0-20 cm＞20-40 cm.

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