陕南黄棕壤、黄褐土分类研究

对黄棕壤和黄褐土的诊断特征进行了比较研究,结果表明,黄棕壤在酸性淋溶条件下,已处于初期富铝化阶段,呈酸性反应,代换酸、水解酸和活性铝含量较高,盐基不饱和,粘粒硅铁铝率和硅铝率较小,粘土矿物以(石至)石为主。黄褐土因受含钙粘黄土母质的影响,阻滞和延缓了富铝化过程,呈弱酸至弱碱反应,代换酸、水解酸与活性铝含量甚微,盐基饱和或基本饱和,粘粒硅铁铝率和硅铝率较高,粘土矿物以水云母为主。成土过程和诊断特征的明显差别,表明黄棕壤、黄褐土应属两个土类。

Research on Classifications of Yellow Brown Soil and Yellow Cinnomon Soil in South Shaanxi

The dignostic feaures of yellow brown soil and yellow cinnomon soil were studied and compared.The results showed that in the case of acidic leaching,yellow brown soil was in the early stage of rich Aluminium, appearing to be acidic reaction, with high contents of substituting acid, water soluble acid and active aluminium and unsaturated salt base, low percentages of clay particles,Si,Fe and Al as well as Si and Al.Pelhamite is the main clay mineral in Yellow brown soil.Owing to the effect of yellow parent materials con-tened with calcium, yellow cinnomon soil delays the process of Al enrichment, appearing to be weak acid and weak base reaction with small contents of substituting acid, water soluble acid and active aluminium, saturated salt base, or general saturated salt base,high percentage of clay particles, Si, Fe and Al, as well as Si and Al.Damourite-schist is the main clay minerals of yellow cinnomon soil.The apparent differences between the soil formation process and dignostic features indicate that yellow brown soil and yellow cinnomon soil beiong to two soil groups.