通过孢子花粉、石英砂颗粒和土壤微形态学分析,研究北亚热带江淮地区白浆化土壤的发生学特性。白浆化土壤下部土体经历了暖温带森林草原景观和亚热带草原景观,为高能化学环境。在母质沉积后,经历了褐土化过程或其他物质堆积,经过一定时期的沉积间断后,堆积新物质,随着气候的变化,成土环境演变为现代气候类型,属亚热带森林草原环境。淀积层也源于黄土状物质,风化程度更强,白浆层则为后期堆积物,不具备高能化学环境。淀积层在高能环境下,存在次生粘化和淀积粘化作用。

Basing on the methods of sporo pollen analysis, analysis of arenaceous quartz surface and soil micromorphology, this paper deals with the genetical properties of the albic soils in the Jiang Huai Area in the Northern Subtropical Zone of China. The spore pollen analysis shows the differences between the upper and the lower horizons in soil forming environment. The upper horizon underwent warm temperate forest steppe landscape and subtropical steppe landscape, which belonged to high chemical energetic environment. After the deposition of parent materials, the soil experienced brown soil process or deposition of other materials,then the deposition suspened for long period of time.With the accumulation of new deposits and climate change, the soil forming environment became the subtropical steppe landscape.The basic condition emerged for the formation of yellow brown soil in higher land,and the lower part became marshland with inadequate water drainage. The form of the arenaceous quartz includes its surface shape and structure, and reflects the obvious differences in soil forming environment between the upper and lower horizons. The surface of arenaceous quartz in the lower horizon, especially the illuvial horizon, generally has secondary SiO 2 sediment. As the surface decomposed, some holes formed along the weak region in the quartz sand, and this behavior stands for the high chemical energetic environment. Since the materials constantly deposited and water concentrated, no high chemical energetic environment appeared in the upper horizon. The diffuse and stress stick membranes are found in the thin section of the soil micromorphology.These membranes are the sigh of the secondary clayization.The fabric and light directioal clay membranes formed in the alluvial horizon for the accumulation of clay. Overall,when the Xiashu loess and other loess materials deposited, the climate was the warm temperate forest steppe zone, it then became the northern subtropical forest steppe zone.Finally,the new materials accumated over the loess derived soils.On the bases of the superipositing parent materials,the lower horizon is now at the secondary clayization stage and after the new materials superimposed,the alluvial horizons will have illuviation of clays.