陕西省南部地区土壤粘粒特性研究

Soil Clay Characteristics in Hanzhong Area of Shaanxi Province

陕西南部土壤粘粒特性的研究发现，陕西省南部北亚热带湿润地区，发育在第四纪下蜀黄土母质上的土壤粘粒含量高，粘化层不明显，粘土矿物以伊利石和蒙脱石为主，粘粒铁富集明显；发育在基岩风化物母质上的土壤粘化层明显，粘土矿物以蒙脱石、蛭石为主，且有一定量的高岭石，粘粒中铝富集强烈。中山区暖温带湿润地区的土壤，粘粒含量较低，粘土矿物以伊利石、绿泥石为主，粘粒中铁、铝富集均不明显，元素的淋溶迁移较弱。

The humid climate area of north subtropics in Hanzhong Basin,the soils developed in the parent materials of argic loess are with high clay,unobvious argic horizon.The clay minerals are mainly illite and montmorillonitehe.With the enrichment of iron element, the soils developed in weathering product of basement rock are with clear argic horizon.The clay minerals are mainly montmorillonite and vermiculite,certain amount of kaolinite,enrichment of aluminium is strong in the clay minerals.The soils developed in the humid climate area of warm temperate zone in medium mountain are with low clay.The clay minerals are dominated by illite and chlorite while enrichment of aluminium and iron are not strong, and leaching and movement of elements are weak and small.