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384 results for “Heracleum”
Growth of Heracleum sosnowskyi Manden. plant in indoor conditions after end of vegetation period
<p>Growth of<em> Heracleum sosnowskyi</em> Manden. plant in indoor conditions after end of vegetation period. The period of observation of plant growth from October 2017 to February 2018. The series of images.</p>
Evaluation of Heracleum sosnowskyi Manden. survivial after snow cover removing in early spring
<p>The results of an experiment on the effect of snow cover removing on the areas occupied by Heracleum sosnowskyi stands in the early spring period. The experimental (impact) and control plots located in the Syktyvkar city suburb (Komi Republic, Russia).</p> <p>Most of calculation were performed in R. Find the file "FrozenHogweed_R_script.r" for calculation reproducing.</p>
Dataset and R-script for simple mechanistic model of Heracleum sosnowskyi seed dispersal by wind
<p>The dataset contains:</p> <p>- primary data about Heracleum sosnowskyi seeds traits (terminal velocity, mass, area, wing loading) and release heights for <em>H. sosnowskyi</em> populations from two geographically distant Russia regions;</p> <p>- results of experiments of model seeds launches under different wind speeds;</p> <p>- R script for exploratory statistical analysis, linear regressions and mechanistc models testing.</p> <p>The anemochorous seed dispersal was generalized with a number of empirical and mechanistic models of varying complexity. The aim of this work was to develop the simplest possible mechanistic model of <em>Heracleum sosnowskyi</em> that allows to determine the distance of seed dispersal by wind with an accuracy comparable to that of empirical measurements. We measured and compared the characteristics of the seeds (terminal velocity, mass, area, wing loading) as well as the release height for <em>H. sosnowskyi</em> populations from two geographically distant Russia regions. We tested two simplest mechanistic models: a ballistic model and a wind gradient model using identical artificial seeds with characteristics similar to those of real <em>H. sosnowskyi</em> seeds. The wind gradient model gave the best results, despite the fact that uniform in shape, weight and size artificial <em>H. sosnowskyi</em> seeds, when dropped simultaneously from the same height, fly off at different distances. This model provides an estimate of dispersal distances with an accuracy comparable to that of empirical measurements. We plan to use the presented model to develop an individual-based model that will allow us to calculate the flight distances of <em>H. sosnowskyi</em> propagules, taking into account real weather conditions in different years and in different parts of its invasion range. All primary data and R-scripts used are freely available at the Zenodo repository (https://doi.org/10.5281/zenodo.3766035).</p> <p> </p>
Fig. 6 in Immediate Allelopathic Effect Of Two Invasive Heracleum Species On Acceptor-Germination
Fig. 6. CCU content accordingly ryegrass germination in leachates of H. sosnovskyi and H. mantegazzianum (p<0,05; mean±SE).
Fig. 5 in Immediate Allelopathic Effect Of Two Invasive Heracleum Species On Acceptor-Germination
Fig. 5. CCU content accordingly rapeseed germination in leachates of H. sosnovskyi and H. mantegazzianum (p<0,05; mean±SE).
Fig. 3 in Immediate Allelopathic Effect Of Two Invasive Heracleum Species On Acceptor-Germination
Fig. 3. Inhibition level of acceptor-rapeseed germination in leachates of H. sosnovskyi and H. mantegazzianum (p<0,05; mean±SE).
Fig. 1 in Immediate Allelopathic Effect Of Two Invasive Heracleum Species On Acceptor-Germination
Fig. 1. Pathways scheme of direct and indirect impacts of invasive species on ecosystem functioning (Jones & Gutiérrez 2007).
Fig. 4 in Immediate Allelopathic Effect Of Two Invasive Heracleum Species On Acceptor-Germination
Fig. 4. Inhibition of acceptor-ryegrass germination in leachates of H. sosnovskyi and H. mantegazzianum (p<0,05; mean±SE).
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000012108244)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000010648636)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sp. (BR0000025605303V)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000012108022)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000012618996)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000010651513)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000010651001)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. stenophyllum Gaudin (BR0000012108343)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. angustifolium (Jacq.) C.C.Gmel. (BR0000010652336)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. angustifolium (Jacq.) C.C.Gmel. (BR0000010649503)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. angustifolium (Jacq.) C.C.Gmel. (BR0000010650967)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
Heracleum sphondylium L. var. angustifolium (Jacq.) C.C.Gmel. (BR0000010649145)
Belgium Herbarium image of <a href="https://www.plantentuinmeise.be">Meise Botanic Garden</a>.
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