关键词: 土壤微形态, 灌溉, 关中地区

Abstract: 【Objective】To compare micromorphological features of both irrigated and non-irrigated soil in Guanzhong Areas, this paper try to illustrate farming method influences on soil-forming process of soil.【Method】Micromorphology is observed under a petrographic microscope and its image is quantificationally measured by Qwin3.1 software. 【Result】 Both irrigated soil and non-irrigated soil have the same as soil profile type,Ap1- Ap2- BC, but the former has a more obvious profile difference. The minerals assemblage of different horizon is very similar, which is mainly composed of Q and Pl. Compared with non-irrigated soil, coarse of irrigated soil is characterized by Length, Area, EqDiameter, Perimeter, Elongation, Roundness, MeanChord and C/F(10μm) ratio; voids are characterized by more regular void shape and more smooth void wall; there are more abundant residual clay and little amount illuvial clay. 【Conclusion】All the results in this study suggest that farming method has the influence on the soil profile difference and micromorphology. The agriculture irrigating could strengthen the degree of weathering, making smaller and rounder coarse, increasing quantities of residual clay and appearing illuvial clay, no-changing minerals assemblage of coarse.