The use of conservational systems of soil cultivation has gained importance due to the need for soil preservation and carbon sequestration from the atmosphere. With the objective of evaluating soil structuring, this study determined the physical attributes and organic carbon contents of a clayey Oxisol in an area of 10 years under four different land uses: i.e., afforestation (AF), no-tillage system with grass-grass succession (corn/corn), no-tillage systems with grass-legume succession (corn/Crotalaria juncea L.) and conventional soil tillage system (corn/fallow). The evaluated areas are located in the Cerrado biome of southeastern Brazil. Each area was sampled at 20 points and undisturbed and disturbed samples were collected in the layers of 0.00−0.10 m, 0.10−0.20 m and 0.20−0.30 m. The attributes evaluated were related to soil aggregation and porosity and, due to the structure of dependence of the variables, the data were subjected to multivariate factor analysis. We observed that, after a long period, the no-tillage system promoted soil aggregation and porosity similar to those of the planted forest and superior to those of the conventional tillage system. The type of crop succession in the no-tillage system caused differences in soil structure, and grass-grass succession (corn/corn) promoted better soil structure compared to grass-legume succession (corn/Crotalaria juncea L.). The greater soil porosity generated by the conventional tillage system was limited to the most superficial layer (0.00−0.10 m) and this effect can be considered ephemeral, due to the presence of a large amount of smaller aggregates that, after the operation, can occupy the generated pores.

由于需要土壤保护和从大气中固存碳，因此土壤保护养护系统的使用变得越来越重要。为了评估土壤结构，本研究确定了四种不同土地利用下10年间黏土Oxisol的物理属性和有机碳含量：造林（AF），草场演替的免耕系统（玉米/玉米），免耕系统，豆科植物演替（玉米/猪屎豆L.）和常规土壤耕作系统（玉米/休耕）。评估区域位于巴西东南部的塞拉多生物群落中。每个区域在20个点进行采样，并在0.00-0.10 m，0.10-0.20 m和0.20-0.30 m的层中收集不受干扰和受干扰的样本。评估的属性与土壤聚集和孔隙度有关，并且由于变量的依存关系结构，因此对数据进行了多元因素分析。我们观察到，长期耕作后，免耕系统促进了土壤的团聚和孔隙度，类似于人工林，并且优于常规耕作系统。免耕系统中农作物的演替类型导致土壤结构的差异，猪屎豆属）。常规耕作系统产生的更大的土壤孔隙度仅限于最表层（0.00-0.10 m），由于存在大量较小的聚集体，这些聚集体在操作后可占据，因此这种影响可以认为是短暂的产生的毛孔。