秦川盆地土壤粘土矿物特征与土壤质地的关系

以灰钙土、耕种灰钙土、砂田灰钙土、砂田盐化灰钙土和旱盐土5种土壤为研究对象,研究了矿物特征和土壤质地的关系。结果表明5种土壤的粒度成分都比较细,以细砂为主,铺砂对土壤质地的影响不显著,土壤质地特征主要是由土壤母质、成土作用决定的。土壤粘土矿物含量最多的样品,也是质地最粘重,或粒度组成最细的样品。而粘土矿物含量较低的样品,粉砂的含量均小于细砂的含量,而且随着粉砂与细砂之间含量差异的扩大,粘土矿物含量逐渐降低。由于秦川盆地土壤的成土环境和成土作用是相似的,因此,虽然它们的质地特征不同,但土壤粘土矿物的类型是相同的,土壤粘土矿物含量的不同,反映的是成土作用进行的阶段或程度的差异。

Relation of soil clay and soil texture in Qinchuan Basin in Gansu

The relation of soil clay and soil texture in Qinchuan Basin,Gansu,China is analsyzesd. The results show that the soil texture is very fine in 5 types of soil. The most component is fine sand. Laying the sand on the cove of the field has little effects on the soil texture, however, the soil texture is effected signifencently by the soil parent materials and formation of soil. The move the soil contnts clay, the finer the texture is. The soil which contents less clay has less silt than fine sand, moveover, the content of clay is getting less and less when the content difference between silt and fine sand is becoming greater. The generation environment and process are same in Qinchuan Basin, while the soil texture is different, the type of clay is the same. This indicates that the difference of the clay content just show the different stage of the soil genaration the different soil has.