摘要
用采自广东省徐闻县的一个铁铝土剖面研究了不同层次土壤的表面电荷特征及电荷的可变性。结果表明,该剖面C层以下土壤的CEC小于88 mmol kg^-1,土壤游离氧化铁在140.9-220.3 g kg^-1之间,为典型可变电荷土壤。土壤表面正电荷的数量及pH改变一个单位时表面正电荷的变化量均随土壤游离氧化铁含量的增加而增加。当pH〈4.0时,土壤氧化铁对表面负电荷的贡献很小;但有机质的增加会使这一pH范围内土壤表面负电荷的可变性增加。该剖面土壤的PZSE高于PZNC,但两者均随土壤游离氧化铁含量的增加而增大。
Soils from different layers of a Ferralosol profile collected from Xuwen,Guangdong Province were used to study the characteristics and variability of their surface charge.The results indicated that the cation exchange capacity（CEC） of the soils below B horizon was less than 88 mmol kg^-1,and the free iron oxides of the soils was in the range of 140.9-220.3g kg^-1.Thus,the soils were typical variable charge soils.The amount of soil positive surface charge and the change of positive surface charge when pH changed by one unit increased with the increase of soil free iron oxides.When pH was less than 4.0,the contribution of soil iron oxides to negative surface charge was very small.While the increase in organic matter led to the increase in the variability of soil negative surface charge in the same pH range.The point of zero salt effect（PZSE） of the soils from the profile were higher than the point of zero net charge（PZNC） of the soils,while both PZSE and PZNC increased with the increase of the free iron oxides in the soils.
出处
《土壤通报》
CAS
CSCD
北大核心
2010年第4期774-777,共4页
Chinese Journal of Soil Science
基金
中国科学院知识创新工程重要方向性项目(KZCX2-YW-409)资助
关键词
富铝土
表面正电荷
表面负电荷
电荷的可变性
Ferralosols
Positive surface charge
Negative surface charge
Variability of surface charge
