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四种浓度(0.4,1.0,4.0,10.0meq/dm)的NaCl、KCl、MgCl_2和CaCl_2溶液和蒸馏水与采自纳塔尔的聚铁网纹层强发育湿润老成土的高度风化酸性土按2.2:1土液比平衡,然后用不可混合液进行离心分离,分析无机溶质。对于每一种盐,提高离子浓度都导致溶液pH降低(蒸馏水平衡液的pH最大为4.95),而铝浓度及其活性增大。其中钠的影响(最大△pH0.47)显然地比其它阳离子(最大△pH0.83)小得多,在钠溶液中铝浓度和活性相应地也较低(与最高氯化物浓度相差10倍)。不论在溶液中加入电解质的性质或浓度如何,溶液中pH、Al~(3+)活性和硅酸盐均有一致的相互关系,这表明该土壤中三水铝石和结晶度差的高岭石的平衡非常接近。试验结果为预测肥料渗入液对心土酸度的影响提供了依据,也表明在酸性土壤的阳离子群中钠的存在可能增加有利影响。
Four kinds of NaCl, KCl, MgCl 2 and CaCl 2 solutions and distilled water with the concentration of 0.4, 1.0, 4.0, 10.0 meq / dm and the polygonal iron mesh layer from Natal strongly developed wet weathering highly acidic soils of old soils according to 2.2 : 1 ratio of soil to liquid, and then centrifuged with immiscible liquid, analyzing the inorganic solute. For each salt, increasing the ion concentration resulted in a decrease in solution pH (the pH of the distilled water balance was 4.95 maximum) while the aluminum concentration and its activity increased. The effect of sodium (maximally ΔP0.47) is clearly much smaller than that of the other cations (maximally ΔP0.83), with correspondingly lower concentrations and activities of aluminum in the sodium solution (10 times the highest chloride concentration) . Regardless of the nature or concentration of electrolyte added to the solution, the pH, Al 3+ activity in the solution and the silicate all have a consistent correlation, indicating that the gibbsite in the soil and poorly crystallized kaolinite The balance is very close. The results provide a basis for predicting the effect of fertilizer infiltration on the acidity of the heart earth and also indicate that the presence of sodium in the cationic population of the acid soil may increase the beneficial effect.