土壤理化性质对铝电极电位的影响

本文系统研究了土壤的某些主要理化性质对铝电极电位的影响。结果表明，土壤水分，土壤松紧度，土壤盐分及土壤ｐＨ对铝电极电位都有明显影响。在土壤饱和水后和饱和水前的一定含水量范围内，则出现一个很大的电位突降。在同一含水量情况下，电位与土壤容重呈明显的线性反相关。土壤盐分浓度的增高能导致电位的负偏。同时在不同土壤中，盐分的作用也各相同。可变电荷土壤盐分的加入对电位的影响比较明显，从土壤ｐＨ的影响可以区分出

EFFECTS OF SOIL PROPERTIES ON THE ELECTRODE POTENTIAL OF ALUMINIUM IN SOILS

The effects of some physical and chemical properties of soil on the electrode potential of aluminium in soils were studied. Results demonstrate that the soil pH, soil salts, soil moisture and soil compactness affect the electrode potential of aluminium in soils apparently. Three regions can be divided according to the effect of pH. The electrode potential of aluminium is negatively correlated with the soil pH in acid and alkaline regions. And there is a voltage-plateau under nearneutral pH, indicating that in this region the effect of the soil pH on the electrode potential of aluminium can be neglected. Different soils have special pH ranges of voltage-plateau, own to their different characteris.ics. Increasing soil salt content causes a shift of electrode potential to negative direction, especially in variable charge soils. Three regions are also found concerning the influence of soil moisture on the electrode potential of aluminium, which went down to the negative direction as soil moisture increased and showed little change after saturation. However, in a narrow range of moisture near saturation point of soil, a large voltage-drop appzared. At the samc level of soil moisture, a negative correlation was observed between the electrode potentials and bulk density which is an index of soil compactness.