本文应用单个土体、聚合土体、土壤景观的概念进行系统分析,研究了长江三角洲淤泥土土层铁的活化度。研究表明,其A层因渍水耕作和施肥,使铁活化度大幅度增高,以土壤剖面发生学论证了土层对称性破缺的耗散结构。由于土壤是非均质体,而且淤泥土土层有先天不均一性,所以,传统土壤学根据以单个土体的分析结果代表整体特征的研究方法是不全面的。 In this paper, the concept of single soil, polymeric soil and soil landscape was used to systematically analyze the iron activation in the silt soil in the Yangtze River Delta. The results show that the layer A is greatly aggravated by soil-tillage and fertilization because of waterlogging and fertilization, and the soil-layer symmetry-breaking dissipative structure is demonstrated by the soil profile theory. Because soils are heterogeneous and silt and soils are inherently heterogeneous, traditional soil science studies based on the analysis of individual soils as a proxy for overall characteristics are not comprehensive.