福建红壤和砖红壤性红壤的地球化学特征

对福建省11个红壤和砖红壤性红壤剖面研究表明,发育于酸性母岩的土壤富硅,钾,贫铁、镁,锰,而发育于基性及超基性母岩的土壤则是富铁、镁、锰,贫硅、钾、铁、铝、钛在剖面中相对聚集,硅、钙、钠、磷相对迁移,其中钠、钙几乎被淋失殆尽.钾、镁在大多数剖面中也是相对迁移的.地形条件与侵蚀—堆积过程的共同作用使位于坡地中、下部的土壤的盐基迁移程度较低.受古气候影响明显的剖面有异常的地球化学特征,显示出较高的脱硅富铝化程度,而其它剖面均处于中度脱硅富铝化阶段.

GEOCHEMICAL CHARACTERISTICS OF RED SOIL AND LATERITIC RED SOIL IN FUJIAN

The element abundance,element migration and enrichment,and some other geochemical characterisics of eleven profiles from Fujian provi- nce were studied,and the effects of parent rook,paleoclimate,topography and erosion process on the geochemical characteristics of the soils were dis- cussed.Soils derived from acid rocks were rich in silica and potassium, poor in iron,magnesium and manganese while the soils from basic and ultr- abasic rock were rich in iron,magnesium and manganese,poor in silica and potassium.In all the profiles,iron,aluminium and titanium accumulated relatively while silica,calcium,sodium and phosphorous were lost.Potassium and magnesium were lost relatively in most of the profiles.The joint effect of topography and erosion process retarded the migration of base in soils situated in the middle and the bottom of a slope.The profile influenced apparently by paleoclimate had abnormal geochemical characteristics,show- ing a higher weathering degree while other profiles were in the middle al- litization degree.