Effect of Potassium and C/N Ratios on Conversion of NH+4 in Soils

TANG Yan; WANG Xiao-Zhi; ZHAO Hai-Tao; FENG Ke

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Effect of Potassium and C/N Ratios on Conversion of NH+4 in Soils

机译：钾碳氮比对土壤NH + 4转化的影响

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Two soils, one consisting of 1:1 clay minerals at pH 4.5 and the other containing 2:1 clay minerals at pH 7.0, were used to estimate the conversion of added NH+4 under different C/N ratios (glucose as the C source) and the addition of potassium. Under lower C/N ratios (0:1 and 5:1), a large part of the added NH+4 in the acid soil was held in the forms of either exchangeable or water soluble NH+4 for a relatively long time and under higher C/N ratio (50:1), a large amount of the added NH+4 was directly immobilized by microorganisms. In the second soil containing appreciable 2:1 type clay minerals a large part of the added NH+4 at first quickly entered the interlayer of the minerals under both lower and higher C/N ratios. In second condition, however, owing to microbial assimilation stimulated by glucose the newly fixed NH+4 could be completely released in further incubation because of a large concentration gradicnt between external NH+4 and fixed NH+4 in the mineral interlayer caused by heterotrophic microorganisms, which imply the fixed NH+4 to be available to plants. The results also showed that if a large amount of K+ with carbon source together was added to soil, the higher K+ concentration of soil solution could impede the release of fixed NH+4, even if there was a lot of carbon source.

机译：使用两种土壤（一种由pH值为4.5的1：1粘土矿物组成，另一种由pH 7.0的2：1粘土矿物组成）来估算在不同的C / N比下添加的NH + 4的转化率（葡萄糖作为碳源））和钾的添加。在较低的C / N比（0：1和5：1）下，酸性土壤中大部分添加的NH + 4以可交换或水溶性NH + 4的形式保持了较长的时间，并且在较高的C / N比（50：1），大量添加的NH + 4被微生物直接固定。在第二种含有明显的2：1型粘土矿物的土壤中，大量添加的NH + 4首先在较低和较高的C / N比下迅速进入了矿物的中间层。然而，在第二种条件下，由于葡萄糖刺激的微生物同化作用，由于异养微生物在矿物中间层中外部NH + 4和固定NH + 4之间的浓度较高，因此新固定的NH + 4可以在进一步培养中完全释放。，这意味着固定的NH + 4可用于植物。结果还表明，如果向土壤中添加大量的K +和碳源，即使碳源很多，土壤溶液中较高的K +浓度也会阻碍固定NH + 4的释放。

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来源
《土壤圈（英文版）》 |2008年第4期|539-544|共6页
作者
TANG Yan; WANG Xiao-Zhi; ZHAO Hai-Tao; FENG Ke;
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作者单位

College of Environment Science and Engineering, Yangzhou University, Yangzhou 225009 China;

College of Environment Science and Engineering, Yangzhou University, Yangzhou 225009 China;

College of Environment Science and Engineering, Yangzhou University, Yangzhou 225009 China;

College of Environment Science and Engineering, Yangzhou University, Yangzhou 225009 China;

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收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
clay minerals, fixed NH+4, N mineralization, organic C, potassium;

机译：粘土矿物;固定的NH + 4;N矿化;有机碳;钾;

Effect of Potassium and C/N Ratios on Conversion of NH+4 in Soils

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