福建主要土壤的粘粒云母含量和供钾潜力

利用X射线衍射法估算了福建省221个土壤样品中粘粒云母含量并讨论了与粘粒云母含量变化有关的因素。结果表明母质是影响粘粒云母含量的主要因素。海积物、河积物及页岩上发育的土壤粘粒云母含量一般较高;基性岩上发育的土壤粘粒云母含量一般较低。风化度较高的赤红壤、红壤、黄红壤和黄壤等土类的粘粒云母含量一般较低。风化度较低的C层的粘粒云母含量一般较B层和A层高,但异源母质的堆积可以使A层粘粒云母含量高于B层和C层。

CONTENT OF CLAY MICAS AND K SUPPLY POTENTIAL OF MAIN SOILS IN FUJIAN

The content of hydrous micas in the clay fractions of main soils in Fujian Province were estimated by X-ray diffraction method. The factors influencing the content of hydrous micas were discussed. Parent material is the major factor influencing the content of hydrous micas in clays. The soils developed from marine deposit, alluvial deposit and shale were richest in clay micas, while those derived from basic rocks were poorest in clay micas. The content of clay micas in the soils with higher weathering degree, such as lateritic red soil, red soil, yellowish red soil and yellow soil ,was generally low. C horizons, which has lower weathering degree than B and A horizons, usually contained more clay micas than A and B horizons. However, the accumulation of xenogenetic parent materials could result in higher content of hydrous micas in A horizon than B or C horizons.