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10 results for “red soils”
Red Maple Seedling Soil Warming Experiment in Harvard Forest Lath House 2015
Microhabitat environmental conditions are an important filter for seedling establishment, controlling the availability of optimal recruitment sites. Understanding how tree seedlings respond to warming soil temperature is critical for predicting population recruitment in the future hardwood forests of northeastern North America, particularly as environmental conditions and thus optimal microhabitat availabilities change. We examined the effect of 5˚C soil warming during the first growing season on germination, survival, phenology, growth, and stem and root biomass allocation in Acer rubrum (red maple) seedlings. While there was no effect of soil warming on germination or survival, seedlings growing in warmer soils demonstrated significantly accelerated leaf expansion, delayed autumn leaf senescence, and an extended leaf production period. Further, seedlings growing in warmer soils showed larger leaf area, stem and root structures at the end of the first growing season, with no evidence of biomass allocation tradeoffs. Results suggest A. rubrum seedlings can capitalize on soil warming by adjusting leaf phenology and leaf production, resulting in a longer period of carbon uptake and leading to higher overall biomass. The absence of growth allocation tradeoffs suggests A. rubrum will respond positively to increasing soil temperatures in northeastern forests, at least in the early life stages.
Geogenic Gases in a Red Wood-Ant Nest and Soil in the Neuwied Basin, Germany 2016
Geochemical tracers of crustal fluids (CO2, He, Rn) provide a useful tool for the identification of buried fault structures. We acquired geochemical data during 7 months of continual sampling to identify causal processes underlying correlations between ambient air and degassing patterns of three gases (CO2, He, Rn) in a nest of red wood ants (Formica polyctena; “RWA”) and the soil at Goloring in the Neuwied Basin, a part of the East Eifel Volcanic Field (EEVF). We explored whether temporal relations and degassing rhythms in soil and nest gas concentrations could be indicators of hidden faults through which the gases migrate to the surface from depth. In nest gas, the coupled system of CO2-He and He concentrations exceeding atmospheric standards 2-3 fold suggested that RWA nests may be biological indicators of hidden degassing faults and fractures at small scales. Equivalently periodic degassing infradian rhythms in the RWA nest, soil, and three nearby mineral springs suggested NW-SE and NE-SW tectonic linkages. Because volcanic activity in the EEVF is dormant, more detailed information on the EEVF’s tectonic, magmatic, and degassing systems and its active tectonic fault zones are needed. Such data could provide additional insights into earthquake processes that are related to magmatic processes at the lower crust.
Red Oak Root and Soil Environmental Gradient Study, Midwest U.S., 2022-2023.
Fine root trait and soils data for Quercus rubra L. (northern red oak) sampled along a Midwestern latitudinal gradient. Fourteen sites spanning 5-14 degrees C were sampled. Each sample represents 2 6 cm deep x 5 cm wide soil cores obtained from near the base of a Q. rubra individuals, with 6 sampled plots per site. Plots were located approximately 40 m apart along a linear transect to be at a cluster of Q. rubra individuals. All 14 sites were visited twice in the growing season of 2022: between June 1st and June 21st, and between July 5th and July 21st. Root traits sampled include average diameter, root tissue density, specific root length, branching intensity, and specific respiration rate. A 1 mm diameter limit cut-off was used. These traits were measured in the field (respiration rates) or from output from RhizoVision Explorer image analysis. Traits are associated with the smaller fine root sample used for respiration measurement in the field (~2 g dry weight). Fine root biomass was also obtained by removing all remaining fine roots in the core, drying, and weighing, and then was multiplied by weight-normalized respiration rates to obtain estimates of fine root ecosystem respiration. This data package is complete, but will be associated with data from 4 sites revisited in 2023 to obtain repeat fine root trait measurements and fungal community community metrics.
A comparative study of red brick powder and lime as soft soil stabilizer (Dataset)
<p>This data is the result of laboratory CBR testing in soaked and unsoaked conditions with or without additional stabilization</p>
Importance of hematite self-reversal in Al-rich soils magnetostratigraphy: Revisiting the Damei red soil sequence in the Bose Basin, southern China
<p>This is the data of the article titled "<strong>Importance of hematite self-reversal in Al-rich soils magnetostratigraphy: Revisiting the Damei red soil sequence in the Bose Basin, southern China</strong>" which submitted for publication to JGR-Solid Earth under the reference # 2021JB023165</p>
Measurement of the albedo of red soil in Ghana in 2020
<p>The albedo of red soil in Ghana was measured with an Albedometer in three different locations in 2020 following the <em>ASTM Standard E1918-06</em>. The dataset contains the calibration and the resolved measurements of the three other albedo measurement locations. Additionally, the uncertainty calculation is included in the dataset.</p>
Effects of maternal genotypic identity and genetic diversity of the red mangrove Rhizophora mangle on associated soil bacterial communities: a field-based experiment
<p>Loss of plant biodiversity can result in reduced abundance and diversity of associated species with implications for ecosystem functioning. In ecosystems low in plant species diversity, such as Neotropical mangrove forests, it is thought that genetic diversity within the dominant plant species could play an important role in shaping associated communities. Here, we used a manipulative field experiment to study the effects of maternal genotypic identity and genetic diversity of the red mangrove <i>Rhizophora mangle</i> on the composition and richness of associated soil bacterial communities. Using terminal restriction fragment length polymorphism (T-RFLP) community fingerprinting, we found that bacterial community composition differed among <i>R. mangle</i> maternal genotypes but not with genetic diversity. Bacterial taxa richness, total soil nitrogen, and total soil carbon were not significantly affected by maternal genotypic identity or genetic diversity of <i>R. mangle</i>. Our findings show that genotype selection in reforestation projects could influence soil bacterial community composition. Further research is needed to determine what impact these bacterial community differences might have on ecosystem processes, such as carbon and nitrogen cycling.</p>
FIGURE 2 in Geranium rubricum (Geraniaceae), a new species from ultramafic soils in the Red Hills, northern South Island, New Zealand
FIGURE 2. Eroding rockland at type locality producing semi-stable scree with cobbles and fines occupied by Geranium rubricum.
FIGURE 1. Geranium rubricum. A. Compact growth habit. B. Rhizomatous growth habit. C. Coriaceous leaves with deeply incised lobes. D in Geranium rubricum (Geraniaceae), a new species from ultramafic soils in the Red Hills, northern South Island, New Zealand
FIGURE 1. Geranium rubricum. A. Compact growth habit. B. Rhizomatous growth habit. C. Coriaceous leaves with deeply incised lobes. D. Bracts inserted at peduncle-pedicel junction (scale bar 2 mm). E. Flower with dehiscent anthers (scale bar 7 mm). F. Sepals (scale bar 2 mm). G. Mericarp (scale bar 5 mm).
Data from: Effects of maternal genotypic identity and genetic diversity of the red mangrove Rhizophora mangle on associated soil bacterial communities: a field-based experiment
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Allen Brain Atlas
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OpenNeuro
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