大寨海绵土是大寨大队在毛泽东思想指引下培育成的高产稳产土壤。各类海绵土与未改良的对照土样相比,水稳性团粒含量和田聚度均有提高。但仅此不能完全反映两种土壤的实质差别,而微结构的研究弥补和充实了这方面的内容。通过偏光显微镜下原状土薄片的观察,海绵土的 The Dazhai sponge soil is a high and stable yielding soil that Dazhai Brigade cultivated under the guidance of Mao Zedong Thought. Compared with unmodified soil samples, the content of water-stable aggregates and the degree of field aggregation of all kinds of sponge soil increased. However, this alone can not fully reflect the substantial difference between the two soils, and the study of microstructure makes up and enriches this aspect. Observation of the intact soil sheets under a polarizing microscope, sponge soil