An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
soilheterogeneity, etc ; geology; kriging; mathematical theory; risk; risk reduction; Show all 6 Subjects
Abstract:
... Site investigation is an important step of geotechnical projects. Previous studies have investigated the benefits of undertaking site investigation for differing scopes by assuming the measurements obtained from site investigation tests are “true” measurements without measurement errors. However, measurement errors are inevitable in all types of site investigation testing methods which cannot be n ...
soilheterogeneity, etc ; Bayesian theory; electrical conductivity; geostatistics; permeability; vadose zone; water; Show all 7 Subjects
Abstract:
... Non-invasive geo-electrical tools are widely used to monitor vadose zone processes. At the core of these methods is the assumption that the obtained subsurface’s electrical conductivity maps can be translated to hydrological state-variables via site-specific hydro-electrical relations calibrated with laboratory or field data. However, the common practice that assumes spatially homogeneous hydro-el ...
soilheterogeneity, etc ; Internet; models; photogrammetry; remote sensing; soil water; spatial variation; Show all 7 Subjects
Abstract:
... Soil moisture is a fundamental ecological component for climate and hydrological studies. However, the distribution patterns of soil moisture are spatially heterogenous and influenced by multiple environmental factors. The knowledge is still limited in assessing the large-scale spatial heterogeneity of soil moisture in in situ data modelling, in situ network design, spatial down-scaling, and remot ...
soilheterogeneity, etc ; adsorbents; cations; goethite; models; pH; particle size; prediction; soil organic matter; Show all 9 Subjects
Abstract:
... Prediction on the release kinetics of metalloids from soils is challenging due to the physio-chemical heterogeneity of soil and the varying binding abilities of metalloid contaminants on soil. In this study, the kinetics of As(V), together with Cu(II), release from two typical field contaminated soils were investigated by the stirred-flow experiments. We formulated the quantitative models to descr ...
soilheterogeneity, etc ; mineralization; nitrogen; olives; plant analysis; soil depth; soil organic carbon; total nitrogen; Show all 8 Subjects
Abstract:
... The objective of this study was to determine the effects of sampling time and depth on some soil properties in a natural olive grove. Soil samples were collected at 0–10 cm (S0) and 10–20 cm (S1) depths in February, May, August, and November between 2013 and 2015 in Cukurova University Campus, Adana, Turkey. The soil properties determined were soil organic carbon (SOC), total nitrogen (TN), C/N, s ...
... Three vigor zones, identified in a Barbera vineyard by remote sensing at full canopy, were carefully ground-truthed to determine, over 2 years, the relative weight of soil factors in affecting within-field variability, and to investigate vigor zone influence on dry matter (DM) and nutrient partitioning into different vine organs. Regardless of season, high vigor (HV) achieved stronger vine capacit ...
José Janderson Ferreira COSTA; Élvio GIASSON; Elisângela Benedet DA SILVA; Tales TIECHER; Antonny Francisco Sampaio DE SENA; Ryshardson Geovane Pereira de Oliveira E SILVA
... Knowing the spatial distribution of soil texture, which is a physical property, is essential to support agricultural and environmental decision making. Soil texture can be estimated using visible, near infrared, and shortwave infrared (Vis-NIR-SWIR) spectroscopy. However, the performance of spectroscopic models is variable because of soil heterogeneity. Currently, few studies address the effects o ...
soilheterogeneity, etc ; habitats; models; plasticity; roots; Show all 5 Subjects
Abstract:
... Soil resources distribute heterogeneously in natural ecosystems, which is known as soil heterogeneity. Responses of plant roots to soil heterogeneity are important for their adaptation to the changes of environments. However, few observations of root systems in soil are recorded, and there is a lack of comprehensive theory for roots responses to soil heterogeneity.Soil heterogeneity including conf ...
soilheterogeneity, etc ; Chernozems; geostatistics; soil penetration resistance; Show all 4 Subjects
Abstract:
... This article examines the relationship between soil heterogeneity and cellulolytic activity. The investigated substrate was a typical chernozem (black soil). Cellulolytic activity was studied by the application method across a regular grid of 7×15 points (21×45 m). The distance between the measurement points was 3 m. Soil heterogeneity determined by the measurement of soil penetration resistance u ...
soilheterogeneity, etc ; biodiversity; ecosystems; geography; soil pore system; Show all 5 Subjects
Abstract:
... Quantifying soil structural and ecological heterogeneity is crucial for understanding their interactions and their relationships to the resilience and health of the wider ecosystem. However, a clear understanding of how structural heterogeneity affects soil biodiversity is still emerging. Previous work has primarily used expensive, often laboratory-based methods to quantify soil pore network struc ...
soilheterogeneity, etc ; carbonates; landslides; rain; soil depth; urbanization; water; Italy; Show all 8 Subjects
Abstract:
... Incorporating the influence of soil layering and local variability into the parameterizations of physics-based numerical models for distributed landslide susceptibility assessments remains a challenge. Typical applications employ substantial simplifications including homogeneous soil units and soil-hydraulic properties assigned based only on average textural classifications; the potential impact o ...
... Cultivation activities play an important role in shaping the spatial distribution of rock fragments in hilly agricultural landscapes. The spatial variation in rock fragment contents (SVRFC) can exert strong effects on the spatial heterogeneity of soil properties with great implications for hydrological fluxes and soil erosion. However, previous research always assumed that rock fragments were homo ...
soilheterogeneity, etc ; catenas; desorption; fractionation; landscapes; pH; soil texture; Arctic region; Show all 8 Subjects
Abstract:
... An in-situ DGT (diffusive gradient in thin films) technique was deployed to gleyic-layer soils identified in the active layer of eight Arctic islands for the release-resupply processes of labile Cd, Zn, and Pb during the thawing season. The capability to maintain the initial soil concentration of these metals is highly dependent upon landscape elevation and soil texture, which determines the labil ...
soilheterogeneity, etc ; bedrock; catenas; clay fraction; cultivation area; electrical conductivity; forests; geostatistics; grasslands; land use; landforms; savannas; soil depth; soil pH; subwatersheds; texture; Trinidad and Tobago; Show all 17 Subjects
Abstract:
... Spatiotemporal patterns of edaphic properties can be useful in modeling underlying mechanisms and controls of watershed processes, however, few studies have quantified the spatial variability of soils in watersheds in the humid tropics. A multivariate geostatistical approach was used to examine the relationships between soil apparent electrical conductivity (ECa) and measured soil and landform par ...
soilheterogeneity, etc ; citizen science; farmers; nutrient management; precision agriculture; soil organic carbon; Show all 6 Subjects
Abstract:
... A major challenge on smallholder farms is the tremendous heterogeneity of soil properties. This is at the same time an opportunity, as it is now feasible - at fine resolution - to quantify variability of soil organic carbon and other properties on farmer fields. This can provide unique insights for moving beyond conventional agriculture, which has largely relied on the use of large doses of inputs ...
soilheterogeneity, etc ; Vitis; fungi; genes; soil ecology; soil microorganisms; species diversity; vineyards; Show all 8 Subjects
Abstract:
... Here we investigate the effect of agricultural integrated management on soil microbial diversity within a vineyard with a history (20 years) of exposure to frequent applications of fertilizers and pesticides each season. Considering that these practices were mainly directed to the target plant (i.e. grapevine) and its surrounding area, we expected that these practices have influenced the soil alph ...
soilheterogeneity, etc ; Artemisia; Oregon; canopy; cattle; nutrient availability; soil nutrients; spatial variation; steppes; Show all 9 Subjects
Abstract:
... Spatial heterogeneity in plant communities promotes coexistence and diversity by providing a variety of niches for different species. In shrub-steppe communities, shrubs create distinct microsites under their canopies (canopy microsites) compared to areas between their canopies (interspace microsites). This creates spatial heterogeneity in soil nutrient availability and herbaceous vegetation. Graz ...
A.L. do Nascimento Júnior; L. da S. Souza; A. de Q. Paiva; L.D. Souza; L.F. Souza-Filho; E.I. Fernandes Filho; C.E.G.R. Schaefer; J.A.G. Santos; M.R. Bomfim; E.F. da Silva; A.C.O. Fernandes; F.A. da S. Xavier
soilheterogeneity, etc ; United States Environmental Protection Agency; environmental law; risk; semiarid zones; Brazil; Show all 6 Subjects
Abstract:
... In a previous study, a high concentration of Pb, Zn, Cr, and Mn in soil profiles located in the semiarid region of Brazil were found in areas used for decades by small family farmers for the production of the crops and raising small animals. This question motivated the current study to evaluate the soil variability spatial dependence on trace elements to quantify and map its occurrence in this are ...
soilheterogeneity, etc ; biochar; biodegradation; denitrification; labile carbon; nitrification; oxidoreductases; porosity; soil pH; straw; Show all 10 Subjects
Abstract:
... Little is known about the microscale heterogeneity of O₂ and pH in the interfaces between soil and amendments. In this study, planar optodes were applied to continuously measure the micro-scale O₂ and pH dynamics in soil amended with a patch of straw and its biochar. The recalcitrant biochar with high porosity had stronger capability to maintain the oxic zone around the patch area. Mainly through ...
... Ants affect carbon mineralization probably through their modifications on spatiotemporal heterogeneity in soil nutrients. However, it is still unclear whether the impacts of belowground-nesting ants on carbon mineralization varied with species. For this study, three belowground-nesting ants (i.e., honeydew harvester Pheidole capellini, predatory Odontoponera transversa, and saprophagous Pheidologe ...