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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Development and origin of the microgranular structure in latosols of the Brazilian Central Plateau: significance of texture, mineralogy, and biological activity.
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Development and origin of the microgranular structure in latosols of the Brazilian Central Plateau: significance of texture, mineralogy, and biological activity.

机译：巴西中部高原的溶胶中微颗粒结构的发展和起源：质地，矿物学和生物活性的意义。

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摘要

Brazilian Latosols are characterized by low activity clay, little horizon differentiation, a weak macrostructure and a strong microgranular structure. The development of the latter that was reported as being possibly related to the fine material mineralogy, location in the landscape, parental material and biological activity is still under discussion. The aim of this study is to discuss the origin of the microgranular structure of Latosols located in the Brazilian Central Plateau. Ten Latosols (L) developed in different parent materials were selected along an approximately 350-km long regional toposequence across the South American Surface (SAS) (L1 to L4) and Velhas Surface (VS) (L5 to L10). The structure of the Latosols was studied in the field and samples of the diagnostic Bw horizons were collected for laboratory analyses. Basic soil characterization was performed on the <2-mm material according to the Brazilian standard procedures. The SiO2, AL2O3, Fe2O3 and TiO2 content was determined after dissolution with 1:1 H2SO4. The microstructure was studied in optical microscopy and scanning electron microscopy in thin sections. The results showed a varying compound strong microgranular structure and weak to moderate medium sub-angular blocky structure independently of the landscape position as well as the parental material, except for the Latosol developed on a quartzite. The Latosols were classified as gibbsitic-sesquioxidic, kaolinitic non-sesquioxid, or kaolinitic-sesquioxid Latosols but there was no relationship between their composition and the development of the microgranular structure in the Bw horizon. The analyses showed indeed several types of microgranular structure with different proportions but without any relationship with their texture and mineralogy. Actually, the types of microgranular structure appeared to be mainly related to soil bioturbation by termites and eventually secondarily by ants. Thus, the weak macrostructure and strong microgranular structure of the Latosols studied, the little vertical differentiation of the horizons, and the lack of a clear relationship between their landscape position and parent material characteristics would result from long-term biotic action with high probability.
机译：巴西Latosols的特征是粘土的活性低，层间差异很小，宏观结构较弱且微颗粒结构较强。后者的发展据报道可能与精细物质的矿物学，景观位置，亲本物质和生物活性有关，目前仍在讨论中。这项研究的目的是讨论位于巴西中部高原的Latosols的微颗粒结构的起源。沿南美洲地表（SAS）（L1至L4）和Velhas地表（VS）（L5至L10）沿大约350公里长的区域，选择了10种以不同母体材料开发的Latosol（L）。在现场研究了Latosols的结构，并收集了诊断性Bw层的样品以进行实验室分析。根据巴西标准程序，对<2-mm的材料进行了基本的土壤表征。 SiO 2 ，AL 2 O 3 ，Fe 2 O 3 和TiO用1：1 H 2 SO 4 溶解后测定 2 含量。在光学显微镜和扫描电子显微镜中研究了薄的组织。结果表明，除了在石英岩上发育的Latosol之外，与景观位置和母体材料无关，化合物具有不同的复合强微颗粒结构和弱至中度中等角度亚块状结构。 Latosols被分类为吉布地-倍半氧化物，高岭土非倍半氧化物或高岭土-倍半氧化物Latosols，但其组成与Bw层中微颗粒结构的发育之间没有关系。分析确实显示了几种不同比例的微颗粒结构，但与它们的质地和矿物学没有任何关系。实际上，微颗粒结构的类型似乎主要与白蚁对土壤的生物扰动有关，最终与蚂蚁有关。因此，长期的生物作用很有可能导致所研究的Latosols的宏观结构较弱，而微颗粒结构却很强，地层的垂直差异很小，景观位置与母体特征之间缺乏明确的联系。

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