Giant ferralsol genesis in Brazilian dry forest

IF 5.4 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
José João Lelis Leal de Souza , Mehmet Zeki Billor , Ming-Kuo Lee , Maria Daniely Freire Guerra , Daniel Kroehling Rodrigues Cardoso , Edvaldo Cardoso , Rafael Albuquerque Xavier , Bartolomeu Israel de Souza , Fabiana Monteiro de Oliveira , Christiane Farias da Fonseca
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Abstract

Brazilian semiarid dominantly hosts thin and incipient soils. These soils have limited information about landscape evolution. This study investigates the formation and paleoenvironmental significance of a six-meter Ferralsol in the Araripe Plateau, Brazilian semiarid region. Through a multi-proxy approach, we analyzed soil morphology, micromorphology, geochemistry, carbon isotopes, and rare earth element (REE) fractionation. Deep weathering and leaching processes formed acidic, clay-rich Ferralsols under past climatic oscillations. Buried umbric horizons at 70 cm and 150 cm depth suggest organic matter accumulation in wetter climatic phases. Radiocarbon dating and δ13C analyses indicate significant climatic fluctuations over the last 8 cal kyr BP, with alternating wet and dry periods influencing vegetation composition and soil formation. Micromorphological and geochemical data indicate a polygenetic soil formed under contrasting conditions and remobilized materials. Negative Ce anomalies in umbric horizons suggest past reducing conditions, while positive Ce anomalies in high-crystalline Fe oxides indicate oxidative environments. A negative Eu anomaly across most horizons reflects deep leaching, whereas a positive Eu anomaly in organic fractions suggests localized metal–organic complexation. Sedimentation rates and isotopic shifts highlight climate-driven geomorphic processes, including colluvial deposition and slope instability. These findings support the hypothesis that Ferralsols in the Araripe Plateau are not strictly formed in situ but have been influenced by erosion, transport, and redeposition processes. Our findings underscore the interplay between climate, geomorphology, and soil genesis in the Neotropical dry forest. The Araripe Plateau’s Ferralsols serve as paleoenvironmental archives, capturing Holocene climate variability and its influence on vegetation and landscape evolution.
巴西干旱森林中的巨型feralsol成因
巴西半干旱地区主要是薄的和初生的土壤。这些土壤中关于景观演变的信息有限。研究了巴西半干旱区阿拉里佩高原6米费拉尔沙的形成及其古环境意义。通过多代理方法,我们分析了土壤形态、微观形态、地球化学、碳同位素和稀土元素(REE)分馏。在过去的气候振荡下,深度风化和淋滤过程形成了酸性、富含粘土的Ferralsols。70 cm和150 cm深度的埋藏棉质层表明有机质聚集在湿润气候阶段。放射性碳定年和δ13C分析表明,在过去8 calkyr BP中,气候波动显著,干湿交替期影响植被组成和土壤形成。微形态和地球化学数据表明,土壤是在不同条件下形成的多成因土壤。棉质层负Ce异常提示过去的还原条件,而高晶铁氧化物正Ce异常提示氧化环境。大多数层位的负Eu异常反映深度浸出,而有机组分的正Eu异常表明局部金属-有机络合作用。沉积速率和同位素变化突出了气候驱动的地貌过程,包括崩积沉积和边坡不稳定。这些发现支持了Araripe高原的Ferralsols不是严格地在原地形成的假设,而是受到侵蚀、运输和再沉积过程的影响。我们的发现强调了气候、地貌和新热带干旱森林土壤成因之间的相互作用。Araripe高原Ferralsols作为古环境档案,记录了全新世气候变化及其对植被和景观演变的影响。
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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