论文部分内容阅读
对采自江淮流域的 7个典型白浆化土壤剖面不同粒级的矿物特性与化学组成进行了研究。结果表明 :该区域白浆化土壤的质地为粉砂质壤土及粘壤土 ,粉粒含量为45 %～ 76% ,粘粒矿物以水云母为主 ,含量为 60 %～ 80 % ,继承了黄土母质的特性。土体硅铝率 (Sa)与硅铁铝率 (Saf)分别为 7.70～ 1 4.0 5与 6.43～ 1 0 .2 4 ,而粘粒的分别为 3.5 3～ 4.2 2和 2 .40～ 3.35。各剖面土体Sa与Saf以表层较高或最高 ,有明显富硅现象 ;而粘粒的Sa和Saf及矿物组成、颗粒组成的层次差异则表现出母质层次上的不连续性。白土层与粘化层的显著分异是由于全新世黄土性沉积物 ,经过冲积淤积交替更迭 ,加上后期淋溶淀积而成 ;脱硅、脱盐基和富铝化及氧化还原淋溶淀积是其重要成土过程 ,后一过程因不同的利用方式 ,强度有所差别 ,以水稻土较强
The mineral characteristics and chemical composition of different grain fractions of 7 typical whitened soil profiles collected from the Yangtze River and Huaihe River Basin were studied. The results show that the texture of white soil in this area is silty loam and clay loam, the content of silt is 45% ~ 76%, the content of clay mineral is mainly aqua mica, the content is 60% ~ 80% Parent material characteristics. The ratios of Sa to Al and Saf are respectively 7.70-1 4.05 and 6.43-1.02.4, while those of clay are 3.53-4.22 and 2.40-3.35, respectively. Sa and Saf in the soil profiles are higher or highest in the surface layer and have obvious silicon enrichment. However, Sa and Saf in the clay particles and the mineral composition and particle composition of the clay show the discontinuity in parent material. The significant difference of clay layer and clay layer is caused by the Holocene loess sediments alternated by alluvial sedimentation and later deposition by leaching and deposition; desilication, desalination, and Al-rich and redox leaching Product is its important soil formation process, the latter process due to different ways of use, the strength of different, strong paddy soil