Similar Soils but Different Soil-Forming Factors: Converging Evolution of Inceptisols in Brazil

Alba L.A.SKORUPA; Sérgio H.G.SILVA; Giovana C.POGGERE; Diego TASSINARI; Leandro C.PINTO; Yuri L.ZINN; Nilton CURI

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Similar Soils but Different Soil-Forming Factors: Converging Evolution of Inceptisols in Brazil

机译：相似的土壤，但不同的土壤形成因素：巴西的感官进化趋同

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Soils result from the interaction of five independent formation factors.If one factor varies,while the others remain constant,different soils can be produced.Herein,we demonstrated an opposing trend,wherein two soils were similar,despite considerable differences in all factors of soil formation.We sampled two Inceptisols (Oxic Dystrudepts) formed on different parent materials (gneiss vs.mica schist),climate (tropical altimontane vs.warmer,drier plateau),topography (1 650 m,45％ slope vs.1000 m,8％ slope),time (rejuvenated vs.old,stable surface),and vegetation (rainforest vs.Cerrado savanna).The two soils had similar chemical properties,whereas the soil on mica schist had finer particle size distribution,lower porosity,and lower saturated hydraulic conductivity.These properties were related to a coarser blocky microstructure compared to the soil on gneiss.Both soils presented active mineral weathering and pronounced pedoplasmation,demonstrated by clay contents ＞ 300 g kg-1,although only the Dystrudept on gneiss possessed coarse rock fragments.The C horizons of both soils presented fragmented clay coatings suggestive of argilluviation,likely relict,because they were not observed in the B horizons.The similarities in many properties of the two Dystrudepts,despite contrasting factors of soil formation,suggest converging evolution and that soil classification at the subgroup level was efficient in grouping similar formative processes in tropical conditions.Moreover,this work revealed that similar pedogenic processes acting on different factors of soil formation can result in similar soil properties,at least for Inceptisols where further soil development is hindered by topographic limitations.

机译：土壤是由五个独立的形成因子相互作用产生的。如果一个因子发生变化，而其他因子保持不变，则可以生产出不同的土壤。这里，我们显示出一种相反的趋势，其中两种土壤是相似的，尽管各土壤因子之间存在相当大的差异我们采样了在不同母体材料（片麻岩和云母片岩），气候（热带altimontane与温暖，干燥高原），地形（1 650 m，45％斜率与1000 m，8）上形成的两种Inceptisols（有氧消化不良）。坡度），时间（恢复与旧，稳定的表面）和植被（雨林与塞拉多热带稀树草原）。两种土壤的化学性质相似，而云母片岩上的土壤粒度分布更细，孔隙率更低，更低与片麻岩上的土壤相比，这些性质与较粗的块状微观结构有关。两种土壤均表现出活跃的矿物风化和明显的成质作用，其粘土含量＞ 300 g kg-1证明，尽管仅t片麻岩中的Dystrudept具有较粗的岩石碎片。两种土壤的C层均显示有碎裂的粘土涂层，表明存在藻化作用，可能是残留物，因为在B层中未观察到。土壤形成，建议收敛演化，并且亚组水平的土壤分类有效地将热带条件下的相似形成过程分组。此外，这项工作表明，作用于不同土壤形成因素的相似成岩作用至少可以导致相似的土壤性质。用于因地形限制而无法进一步发展土壤的Inceptisols。

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《土壤圈（英文版）》 |2017年第4期|747-757|共11页
作者
Alba L.A.SKORUPA; Sérgio H.G.SILVA; Giovana C.POGGERE; Diego TASSINARI; Leandro C.PINTO; Yuri L.ZINN; Nilton CURI;
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Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

Departamento de Ciência do Solo, Universidade Federal de Lavras, Campus, Lavras MG 37200-000 Brazil;

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Similar Soils but Different Soil-Forming Factors: Converging Evolution of Inceptisols in Brazil

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