气候对巴西东北部博博雷马省 Luvisols 矿物学和形成的影响

IF 1.7 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of South American Earth Sciences Pub Date : 2024-10-17 DOI:10.1016/j.jsames.2024.105197

Vitória Regina Faustino da Silva , Artur Henrique Nascimento da Silva , Marilya Gabryella Sousa , José Coelho de Araújo Filho , Marcelo Metri Corrêa , Grace Bungenstab Alves , Tiago Osório Ferreira , Jane Kelly Silva Araujo , Caroline Delpupo Souza , Juliet Emilia Santos de Sousa , Jean Cheyson Barros dos Santos , Valdomiro Severino de Souza Júnior

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引用次数: 0

摘要

巴西半干旱地区约有 360 万人以农业为生，因此极易受到气候的影响。在这一地区，Luvisols 是非常肥沃的土壤，降雨模式不规则。然而，气候对这些土壤发展的影响尚未得到深入研究。我们旨在说明降雨量的变化如何影响 Luvisols 的形成，从而影响土壤形态和矿物成分。在不同的年平均降水量（415、673 和 777 毫米）和蒸散量（1447、1335 和 1220 毫米）条件下，我们对三个 Luvisol 剖面进行了形态描述、物理、化学、矿物学和微观形态分析取样和分类。结果表明，在不同降雨量条件下，形成 Luvisol 的主要过程是霰化，而不是粘土冲积。所有土壤的成土过程都是一致的，但降雨量的增加增强了成土过程，从而导致土壤形态的改变。土壤颜色受降雨量的影响，在较潮湿的环境中，由于产生了较多的成土氧化物，土壤颜色呈红色。干旱地区的陆相溶胶因盛产镜铁矿而具有明显的裂缝，而在较湿润地区，它们主要是高岭土，没有任何裂缝，这意味着在较高降水条件下形成的陆相溶胶具有更好的农业利用潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Impact of climate on mineralogy and formation of Luvisols in Borborema province, northeastern Brazil

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Impact of climate on mineralogy and formation of Luvisols in Borborema province, northeastern Brazil

Approximately 3.6 million people in the semi-arid region of Brazil depend on agriculture, making it highly susceptible to climatic impacts. Luvisols are highly fertile soils in this region, with irregular rainfall patterns. However, the effect of climate on the development of these soils has not yet been thoroughly studied. We intended to illustrate how variations in rainfall quantity influence the formation of Luvisols, thereby affecting soil morphology and mineral composition. Three Luvisol profiles were morphologically described, sampled for physical, chemical, mineralogical, and micromorphological analyses, and classified under different mean annual precipitation (415, 673, and 777 mm) and evapotranspiration (1447, 1335, and 1220 mm) conditions. The results obtained showed that argillation, rather than clay illuviation, is the predominant process in Luvisol formation under different rainfall conditions. Pedogenetic processes were consistent across all soils but were enhanced by increased rainfall, leading to alterations in soil morphology. Soil color is affected by rainfall, resulting in a reddish hue in a wetter environment because of the higher amount of pedogenic oxides created. Luvisols in dry areas feature prominent cracks due to the prevalence of smectites, whereas in wetter regions, they are mainly kaolinitic and do not exhibit any cracks, implying that Luvisols formed under higher precipitation conditions have better potential for agricultural use.

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来源期刊

Journal of South American Earth Sciences 地学-地球科学综合

CiteScore

3.70

自引率

22.20%

发文量

364

审稿时长

6-12 weeks

期刊介绍： Papers must have a regional appeal and should present work of more than local significance. Research papers dealing with the regional geology of South American cratons and mobile belts, within the following research fields: -Economic geology, metallogenesis and hydrocarbon genesis and reservoirs. -Geophysics, geochemistry, volcanology, igneous and metamorphic petrology. -Tectonics, neo- and seismotectonics and geodynamic modeling. -Geomorphology, geological hazards, environmental geology, climate change in America and Antarctica, and soil research. -Stratigraphy, sedimentology, structure and basin evolution. -Paleontology, paleoecology, paleoclimatology and Quaternary geology. New developments in already established regional projects and new initiatives dealing with the geology of the continent will be summarized and presented on a regular basis. Short notes, discussions, book reviews and conference and workshop reports will also be included when relevant.