Paleoenvironmental context of fluvial soils in the dryest region of Brazilian semiarid

Earth Surface Processes and Landforms, Год журнала: 2025, Номер 50(2)

Опубликована: Фев. 1, 2025

Abstract Paleoenvironmental analysis in the Brazilian semiarid region is challenging. The low occurrence of flooded regions limits preservation pollen and accumulation organic matter. In well‐drained sites, high pH intense erosion destroy phytoliths. studies performed limestone caves indicate that climate conditions were established last 5 kyr before present Northeastern Brazil. these conditions, alluvial deposits are potential sources information about recent past evolution once size, selection composition sediments reflect transport. This study aimed to analyse drainage Borborema Plateau Sertaneja Low Surface, two driest Four Fluvisols one Cambisol described fans. Physical, chemical sedimentological analyses performed. Selected horizons dated according OSL method. Variability texture, mineral carbon content discontinuities all soil profiles. Layers very poorly selected coarse material deposited high‐energy depositional systems interbedded with clay‐rich layers by low‐energy energy. abundance Fe, Si, Ti, Ca K indicates variation source materials. age between profiles four evolutionary stages 2,700 ~100 yr. higher variance frequent low‐magnitude sedimentation events. These events typical climates because they sediment transport capacity ephemeral rivers. On other hand, lower buried A suggest aggradation intercalated stabilized periods, when vegetation was bioturbation formed horizons.

Язык: Английский

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Dual mycorrhizal associations in tea tree (Melaleuca alternifolia) differ between Australian temperate shrublands and subtropical forests

Plant and Soil, Год журнала: 2025, Номер unknown

Опубликована: Янв. 2, 2025

Tea tree (Melaleuca alternifolia) is an economically important crop with a narrow natural distribution in eastern Australia. Coastal and upland tea ecotypes have been identified based on unique shoot root traits, but their mycorrhizal associations remain unknown. Dual mycorrhization—the ability of plants to associate both arbuscular (AM) ectomycorrhizal (ECM) fungi—is particularly common among Australian Myrtaceae, including Melaleuca species, has not yet investigated tree. We the three coastal two populations using ITS2 metabarcoding anatomical observations. Our results revealed that dual plant, showing variability symbioses ecotypes. ECM percentage colonisation was significantly lower ecotype compared ecotype, despite exhibiting higher levels fungal richness. In contrast, richness AM order Glomerales than comparable were observed between these Mycorrhizal community composition also differed study provides evidence species can host fungi simultaneously within individual plants. findings suggest vary across native habitats, which differ climate, soil characteristics, vegetation structure.

Язык: Английский

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Nearby woody patches and microtopography reduce grass dieback during extreme drought

Global Ecology and Conservation, Год журнала: 2025, Номер unknown, С. e03596 - e03596

Опубликована: Апрель 1, 2025

Язык: Английский

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Minerals, Microbes and Melanin Drive Differential Incorporation of Fungal Necromass Carbon and Nitrogen into Mineral-Associated Organic Matter

Soil Biology and Biochemistry, Год журнала: 2025, Номер 208, С. 109843 - 109843

Опубликована: Май 15, 2025

Язык: Английский

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