Saturated hydraulic conductivity and steady-state infiltration rate database for Brazilian soils
20/jan/2025
ABSTRACT Soil saturated hydraulic conductivity (Ksat) and steady-state infiltration rate (SSIR) are essential and necessary soil properties for different geoscience applications. Values of these hydraulic properties for the Brazilian territory are difficult to access and are dispersed in research efforts carried out around the country. This study developed an easy-to-manipulate, freely accessible database of soil saturated hydraulic conductivity, comprising field and laboratory analyses, and steady-state infiltration rates for Brazilian soils. This database was named Ksat-SSIR-DB. One analysis of the Ksat-SSIR-DB […]
Soil organic carbon sequestration under Araucaria angustifolia plantations but not under exotic tree species on a mountain range
19/jun/2024
ABSTRACT Plantation forests can be efficient C sinks in biomass and soil organic carbon (SOC), but the latter depends on many factors, including climate. Tropical humid, mountain areas have cooler temperatures, slowing microbial decomposition, and thus can store considerable SOC. However, the effects of forest plantations on SOC of these montane areas are still poorly studied. Here, we aimed to assess changes in SOC, and related soil properties, after conversion of native rainforest to plantations of five tree species, with […]
Micromorphology and Genesis of Soils from Topolitosequences in the Brazilian Central Plateau
04/set/2019
ABSTRACT The micromorphology of deeply weathered soils (Ferralsols/ Latossolos ) from the Central Plateau of Brazil remains little studied, and its affiliation to different parent materials, poorly known. To clarify the processes of soil formation of these acric, gibbsitic, Fe-oxide rich Ferralsols, three lithotoposequences on local ultrabasic to basic intrusive rocks were studied. The influences of mixing and pedobioturbation are evident in all soils, and Ferralsols of the Central Plateau of Brazil are polygenetic, based on the coarse mineral composition, […]
Performance of the Groenevelt and Grant Model for Fitting Soil Water Retention Data from Brazilian Soils
17/jul/2019
ABSTRACT The soil water retention curve (SWRC) is essential for vadose zone hydrological modeling and related applications. In 2004, Groenevelt and Grant (GRT) presented a mathematical model for describing the SWRC and reported its mathematical versatility and good fit to soils from a Dutch database. In order to evaluate the application of GRT to SWRCs of Brazilian soils, we aimed to analyze the performance of GRT for 72 soils from Brazil. Besides that, the obtained results with GRT for these […]
Assessment of Trace Element Contents in Soils and Water from Cerrado Wetlands, Triângulo Mineiro Region
24/abr/2019
ABSTRACT In the Brazilian Cerrado biome, there are wetlands locally known as “Veredas”, which are swampy plains between hills and rivers. Since the 1970’s, the Cerrado biome has been gradually converted to livestock, crop, or forestry production. Until now, very few studies were conducted to evaluate the baseline contents of trace elements in Cerrado wetland soils. Due to their position in the landscape (bottom lands), the wetlands are potentially susceptible to contamination by runoff and/or leaching from surrounding areas at […]
Phosphorus Forms in Ultisol Submitted to Burning and Trituration of Vegetation in Eastern Amazon
06/abr/2016
ABSTRACT The use of fire to prepare agricultural areas is a technique still used by small farmers in eastern Amazon. This type of management changes the dynamics of soil nutrients, especially phosphorus, which constitutes the most limiting nutrient for crop production in tropical soils. This study was carried out to evaluate changes in phosphorus forms in an Argissolo Amarelo Distrófico (Ultisol) submitted to burning and trituration of secondary forest in eastern Amazon. The evaluated systems were: slash-and-burn of vegetation; slash-and-mulch […]
Mercúrio em Solos da Região Sudeste do Brasil sem Influência Antropogênica e sua Correlação com as Características Químicas e Físicas
01/maio/2015
A correlação entre as características físicas e químicas do solo e o teor de mercúrio natural é importante para identificar aquelas que mais influenciam na retenção desse elemento nesses solos e sua distribuição nos diversos compartimentos ambientais. Esse estudo teve por objetivos determinar o teor de Hg de solos sem influência antropogênica e correlacionar esse teor com as características físicas e químicas dos solos. A relevância deste trabalho se deve ao fato que a maioria das pesquisas é focada em […]
ESTIMATIVA DA DENSIDADE DO SOLO POR EQUAÇÕES DE PEDOTRANSFERÊNCIA NA AMAZÔNIA CENTRAL
01/mar/2015
A densidade do solo é um parâmetro de difícil aferição no campo da floresta amazônica e exige rigor metodológico para realizar inventários dos estoques de C e nutrientes nos solos, fazendo com que esse processo se torne oneroso e, certas vezes, inviável, dependendo das condições de trabalho. Objetivou-se com este estudo gerar modelos para estimar a densidade do solo a partir de parâmetros facilmente medidos em campo com confiabilidade, presentes em muitos inventários pedológicos. A construção dos modelos de regressão […]
Funções de pedotransferência para a estimativa de parâmetros da curva de retenção de solos do nordeste brasileiro
01/abr/2013
Foram desenvolvidas funções de pedotransferência (PTFs) para estimar os parâmetros (α, n, θr and θs) do modelo de van Genuchten (1980), utilizados para descrever curvas de retenção de água no solo. Os dados usados foram provenientes de diversas fontes, principalmente de estudos realizados na Região Nordeste pelas universidades, pela Embrapa e Codevasf, totalizando 786 curvas de retenção, que foram divididas em dois conjuntos de dados: 85 %, para desenvolvimento das PTFs, e 15 %, para teste e validação, considerados como […]
Critérios de calagem e teores críticos de fósforo e potássio em latossolos sob plantio direto no centro-sul do Paraná
01/fev/2013
A adoção do plantio direto (PD) em substituição ao preparo convencional promove alterações na dinâmica de nutrientes e na acidez no solo, podendo influenciar as relações solo-planta e, portanto, os critérios de manejo da fertilidade do solo. Este estudo teve como objetivo determinar os critérios de recomendação de calagem e os teores críticos de fósforo (P) e potássio (K) para o sistema de rotação de culturas envolvendo soja, milho, trigo, cevada e aveia branca, amplamente adotado na região Centro-Sul do […]